Windows 7 USB/DVD Download Tool (WUDT) is unable to copy files

This post explains why the Windows 7 USB/DVD Download Tool (WUDT) is unable to copy the install files to the USB drive in some cases. The tool allows you to create a copy of your Windows 7 ISO file on a USB flash drive.

Michael PietroforteMVP By Michael Pietroforte - Thu, April 8, 2010 - 342 comments google+ icon

Michael Pietroforte is the founder and editor of 4sysops. He is a Microsoft Most Valuable Professional (MVP) with more than 30 years of experience in system administration.

Update: If you have problems Windows 7 USB/DVD Download Tool you can try the free alternative Rufus. The most powerful tool for creating a bootable Windows setup flash drive is WinSetupFromUSB.

You might have heard of the stir that Microsoft’s Windows 7 USB/DVD Download Tool (WUDT) caused last year when some Open Source watchmen recognized that the tool contained code that violated the GPL. Microsoft was then “forced” to release WUDT under GPLv2. Considering the upset in the media about this incident, I expected a luxurious tool that comes with lots of customization features. I was somewhat disappointed to discover it does nothing else but copy the contents of a Windows 7 install DVD to a USB stick and make it bootable.

Windows-7-USB-DVD-Download Tool-WUDT

The funny thing is that WUDT even failed to perform this simple task with my no-name USB stick. This message was the only thing that the Open Source tool could do for me:

We were unable to copy your files. Please check your USB device and the selected ISO file and try again.

At least, my cheap stick wasn’t the cause because everything worked perfectly when I manually did the job (hopefully without violating any Open Source laws). So, I thought, I would write this post for those who might run into the same problems and think they need to buy another USB stick. After all, this is Microsoft software and there are not many options to integrate bugs in such a simple tool.

Anyway, here is what you have to do. Launch a command prompt with admin rights and run the diskpart tool. Note: Before you run these commands read the warning below!

The “list disk” command will show you the connected drives and with “select disk”, you can choose your USB stick.

WARNING: Be careful to select the right drive or else your day won’t have a happy end because if you select the wrong drive you will lose all your data on this drive!

The crucial step here is the “clean” command. It overwrites the MBR and the partition table (thereby, deleting everything on the stick). My guess is that WUDT misses this step and only formats the flash drive. It appears my memory stick had some odd partitions (which is not uncommon). When I tried WUDT again with this prepared stick, the Open Source tool mastered its task without further murmur.

By the way, this is also the reason why you shouldn’t use the Windows Disk Management applet to prepare the USB stick. This GUI doesn’t offer a clean command.

After you prepare the stick, you have to copy the contents of your Windows 7 DVD to the thumb drive, and you are done. If you only have an ISO file, you can use Virtual CloneDrive to mount the Windows 7 install DVD first.

Instead of formatting the partition with FAT32, you can also use NTFS (like WUDT does), but then you need an extra step to make the drive bootable:

“X:” is the drive letter of your USB stick. Bootsect.exe can be found on the Windows 7 DVD in the boot folder. However, I can’t really recommend using NTFS. My USB stick, at least, appeared to be slower with NTFS.

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342 Comments- Leave a Reply

  1. avatarLuke says:

    Thanks for posting this Michael.

    I used the WUDT countless times on the same Kingston G2 stick, until one time it decided not to restore – strange.

    Anyway, it’s working again so thanks again!

  2. That’s interesting. I thought it is only a problem with unprepared USB drives. Seems there are some other bus in WUDT.

  3. avatarThew says:

    This worked to correct the problem for me. I had previously used my USB drive to boot an Apple Mac X OS and clearly it had some residual MBRs that needed to be cleaned.

  4. avatarFinn says:

    Thanks Michael!

    That clean command did the trick. U just saved me a whole day of fiddeling arround!

  5. avatarAnthony says:

    I’ve been struggling with this for a while. This post cleared it right up. Many thanks!

  6. avatarTerry Walsh says:

    Fantastic workaround – a big thank you.

  7. avatarhans says:

    thanks, it works! :)

  8. avatarAdrian says:

    Nice one! Thanks very much, bit of a head scratcher!

  9. avatarRene Treffer says:

    I recently had the same problem with this MS tool, The solution was quite simple: disable Avira (free antivirus tool)! It turns out that the antivirus software detects malicious activities on the usb device (surprise, we are trying to make it bootable & copy stuff like autorun.inf!).

    So if you see this “can’t copy files”, try to disable your antivirus software!

  10. avatarshanon says:

    thanks very much — i was totally stuck and this worked great.

  11. The problem resides in the partition table format.

    WUDT need a ms-dos partition table format, some cheap usb sticks don’t have a partition table, o some special operations like dd an debian image to the sticks erases that partitions.

    My solution is open gparted (or any partition editor) and create a ms-dos partition table on the stick.

    After that WUDT will work perfect.

  12. avatarUser5001 says:

    Thanks :)

  13. avatarYogesh says:

    diskpart command with clean did the job
    thanks, it really works!

  14. avatarLeandro says:

    Great post, thank you very much!
    Worked fine!

  15. avatardimaudi says:

    big thanks, it’s helpfull

  16. avatarBenjamin says:

    Thanks Michael, your post solved the problem for me.

  17. avatarKorean says:

    Diskpart doesn’t work well in xp.
    Because usb drives don’t seem when typing “list disk” at XP.
    They will be able to seem at least Vista.

  18. avatarmihai says:

    Thank you for sharing. Microsoft tool is annoying….your steps did the clean install from usb stick quick and easy.

    Thanks again for helping me getting out from nowhere

  19. avatardome says:

    Thanks a lot! this is was so helpful!!

  20. avatarcaswell says:

    I’m not the most computer literate. Is there an idiot’s guide for the command prompt? Or at least for this process?

  21. avatarcaswell says:

    Nevermind. Trial and error prevails! (And I didn’t blow up my computer!)

  22. avatarOnecar says:

    Much appreciated, have been experiencing this kind of strange behaviour. Anyways it works flawlessly for me now, thanks a lot for your advice 😉

  23. avatarcleison says:


  24. avatarimperator says:

    nice ware…
    but something wrong with my usb device after using this software.
    my computer did not recognize my usb device anymore.
    can anyone help me?

  25. avatarkrky says:

    Good Work guy !!!
    work pefectly !

  26. avatarPeter says:

    Thanks a lot for this post, worked a treat when my Sandisk Micro Cruzer wouldn’t work with the USB DVD tool, where it had done before.

    I have another USB stick with the same problem so gonna test your solution with that and if it works, you just resurrected an old USB stick for me!


  27. avatarNet Guy says:

    Thanks a lot. This worked for me.. I no longer get that ugly error!

  28. avatarWaruna says:

    Thanks Brother. Great.

  29. avatarGlenn Ruel Senorin says:

    Just like Rene Treffer above. I also got the message do to Avira. Disabling Avira allowed me to use WUDT.

  30. avatarVincent says:

    good job~ thank you~

  31. avatarJeff says:

    For your information:
    You can also correct that problem with the “HP USB Disk Storage Format Tool 2.2.3”, download here or google it:

    Run it as admin, choose the correct drive and do a quick format.

  32. avatarAndyle says:

    Thank you, my problem has been resolved, thanks a lot.

  33. avatarmitallast says:

    Thank you, great!

  34. avatarSzam says:

    Thanks a lot man, works great!

  35. avatarkwon says:

    wow thanks man helped me a lot.

  36. avatarlinuxeasy says:

    Hey guys, just format your usb drive with HP USB DISK STORAGE FORMAT TOOL, which can also be found here:

    and format your usb stick by selecting fat32 filesystem (quick format will do, no need to check msdos filesystem stuffs)

    and again run the WUDT, and this time it copies. thanks all.

  37. avatarAndrew says:

    Thanks very much, this worked for me!

  38. avatarStephane says:

    Yes, the clean command did the trick. Thanks a lot.

  39. avatarlukasz says:

    great! it’s working perfect :-)

  40. Hi man

    I consider myself to be an IT prof or atleast somewhat pro :) – I had a hard time getting this to work but with your guide it just worded Flawlessly. Thanks mate

  41. avatarMr Black says:

    oh thanks so much for this post. you are the best ever.

  42. avataradhamsalm says:

    u r great person ever that problem scared me alot i thught my USB Stick is gone thanx alot brother

  43. avatarA dude says:

    you saved my life twice with this Tut

    thank you so much Michael Pietroforte

  44. avatarAl Strickler says:

    This worked perfectly for me. Thanks!

  45. avatarGodsmith says:

    There are a lot of guides on the net regarding making a thumb drive bootable with or without the download tool, but none explains WHY it works (and doesn’t work) like yours do. Two thumbs up!

  46. avatarkintaro says:

    I have similar problem, but the solution was to disable antivirus which blocked copy process.

  47. avatarCRDN says:

    DUDE…………. YOU ROCK!!!!! 😀

  48. avatarCindy Stokes says:

    OMG, I love you!!! Thank you!!!

  49. avatarkoiloli says:

    thanks alot…haha, it is copying…

  50. avatarimx4uxx says:

    You can try HP USB Disk storage format tool.
    I formatted my USB with this tool and then used windows 7 USB DVD download tool and it worked like a charm.

    I had error like can not copy before.

  51. avatarA dude says:

    ok you now saved my life 3times

    thank you again

  52. avatarMaxien says:

    Thanks a lot!!

    However you don’t need to manually move the files to the USB. I did the command promt thing then ran Windows 7 USB DVD Download Tool again and it is now copying the files onto the USB.

    Thanks a lot though!! :o)

  53. avatarLouis-Alexandre says:

    Thx alot. The step indicated resolved my issue.

  54. avatarmattti says:

    Thanks very much!!!
    I was about to throw away my usb stick.

  55. avatarAlejandro says:

    Thank you!! it works awesome 😀

  56. avatarzhuk says:

    Great! Thank you. Very helpful information.

  57. avatarMr_Son says:

    Thank you very much. It works very good

  58. avatarSamuel Mossberg says:

    This worked brilliantly, thank you!

  59. avataradi says:

    THANK’s a million now it is perfectly working I tried everything from quick formating to disk formating but nothing worked except yours THANKS !

  60. avatarAuraria says:

    I am not sure when it comes to choosing the ISO file, I have no idea what to click! any suggestions?

  61. avatarEvandro says:

    thx dude my problem was solved as you describe, very good Tutorial!

  62. avatarAmazed says:

    Thank you so much!!!!!!111111

  63. avatarbluescrren says:

    thx a lot!!!
    i really thought mb its my stick, couse it worked with my old one i just lost.
    but now after the preparation no problem ;D

  64. avatarKrzaq says:

    Really great job with that article.
    Thanks a lot.

  65. avatarH. H. Sajjad says:

    Thanks, it worked.

  66. avatarPolo says:

    Thank you so frekkin much!

  67. avatartito says:

    I had this problem.. I solved this problem desactivating my avira…

  68. avatarDouglas says:

    Thanks to Michael Pietroforte for the procedure and Rene Treffer for the tip related to Avira. It works fine to me now!

  69. avatarsygyzy says:

    Thanks a bunch for posting this. I knew my USB stick was not defective but the download tool would not copy the files no matter what I tried. Using your instructions, I was able toa get it working.

  70. avatarDave says:

    Thanks bro that helped a ton 😀

  71. avatarPablo says:

    This post was really helpful!! thanks for your help!!!

  72. avatarFeras says:

    thank’s. i’m so happy about this solution

  73. avatarIbrahim52 says:

    Whoever you are buddy. I salute you for posting the MOST SMART WAY to get rid of this annoying error.

  74. avatarAJ says:

    This works!

    I made a Google Chromium OS boot disk on my USB drive and it created half a dozen non windows partitions. Disk manager was having problems even deleting them, I got another program to remove them and used Windows to reformat it but it was the MBR that was causing problems.

  75. avatarparabel says:

    Thank you! :) Had the exact same problem, found this through Google.
    Quite lame that Windows’ disk management doesn’t offer the “clean” option in the GUI and that the WUDT doesn’t realize where the error lies.

  76. avatarJamal Sheriff says:

    I’m trying this. But the clean option wont work… Everytime I select my flash drive and try and clean it. It says there is no disk selected. Please select a disk and try again.

  77. avatarJamal Sheriff says:

    NEVERMIND.. Presistence is key.. I went over to a computer with windows 7 and did it from there.. God dam windows xp 32bit.. God dam you to hell..

  78. avatarHalaster says:

    dude – u rock – I installed a WIN XP on my second partition, and it destroyed the MBR of WIN 7, thanks to you its now copying files to my USB – I hope I can boot from my USB to fix the MBR…

  79. avatarchris says:

    thanks a lot 😉

  80. avatarWydi says:

    Thanks once more! Worked flawlessly. :)

  81. avatarPaul says:

    Thanks! Had the same problem and your solution worked like a charm!

  82. avatarMasmas says:

    Wow. Seems that I’m the only idiot who can’t get it to work. I tried with diskpart, which seems to do what it is supposed to do, but to no effect. Tried the HP Tool, but that won’t work either. Turned off the antivirus software (ESET), but there’s nothing to be done. It just won’t give in.

    My USB Stick is from Lexar (8gb). Any chance I missed something important? Or is there a possibility that some sticks just won’t work no matter what?

  83. avatarMasmas says:

    P.S.: WUDT actually starts copying but stops really quick. A few files find their way to the USB stick. Does that indicate… something? (sry for my english)

  84. avatarKelly Lipp says:

    This did not work for me. I wonder why Microsoft doesn’t just fix this…

  85. avatarCarlo Fajardo says:

    The diskpart tool worked great! For those people who can’t understand what to type, here you go:
    – Run “diskpart” from a command prompt with admin rights
    – list disk
    – select disk # (the number of your USB)
    – clean
    – create partition primary
    – select partition 1
    – active
    – format quick fs=fat32
    – assign

  86. avatartommy says:

    thanks very much, Michael, after a lot of search, this is the most clear, simple and reliable article I’ve ever found

  87. avatarJames says:

    In my case the flash drive had been used previously as XBOX 360 storage. Even after formating it again in Windows the WUDT utility would complain. Your tip solved the issue.

  88. avatarMasse says:

    My experience just so if you don’t get it to work, you don’t have to go mad and pull your hair out:

    I think some sticks just don’t work, no matter what. With two sticks I tried everything mentioned here and then some, but no use. Then, I tried two other sticks and the first one worked right away and the second had to be prepared the way you explained.

  89. avatarMasse says:

    P.S.: Might be coincidence but the really cheap stick and the really expensive stick didn’t work. The two working were in the medium price segment.

  90. avatarspekkio says:

    You are awesome!

  91. avatarchris says:

    nice work – helped with installing windows 8 preview

  92. avatarcommenter says:

    Thanks. It would be easy if you wrote commands separately!

  93. Thanks for the hint. It appears the page was rendered incorrectly after the last update. I corrected it now.

  94. avatarJoolz says:

    Works a treat. Getting the unable to copy files error. Tried running through the diskpart steps but would not recognise the USB stick as I was using an XP machine. Tried installing the MS tool on a Win7 machine and retried the steps. After following your series of DISKPART commands the ISO copy tool works perfectly.
    Thaks for fixing a very frustrating problem.

  95. avatarJoolz says:

    Maybe add a note to your instructions that you’ll need a Vista or Win7 machine to be able to perform the commands. Otherwise the earlier comment regarding using the HP tool may be necessary.

  96. avatarjason says:

    thank you so much! you saved my life!
    i have been looking for a solution forever and stressing about it.
    you are the man!

  97. avatarkitoliwa says:

    Great! this really worked. finally. A big thanks!!

  98. avatarJack says:

    Thank you, this worked like a charm. This is the 2nd time i’ve used this to fix the problem :).

  99. avatarsylee says:

    so after “list disk” i typed “1” for the disk 1 and it brings up the commands.. so i typed “clean” and it says “there is no disk selected. please try again”.. help!

  100. avatarAvira is wrong says:

    Also in my case, WUDT report: “We were unable to copy your files. Please check your USB device and the selected ISO file and try again.” I disabled my free antivirus Avira and all worked well (as Rene Treffer written above). Avira blocked a file named “autorun.inf” written on USB stick and everything went wrong from that point.

  101. avatarAdam Ralph says:

    Thanks very much – this solution worked for me perfectly.

  102. avatarJohn says:

    Thanks for that.
    Got me past an annoying issue.
    Now I’m off to try it out with Server 2008 R2.
    Greatly appreciated.

  103. avatarordigas says:

    You rock!!!

    Thanks a lot for the advice.

  104. avatarRocko says:

    Worked! Thanks a ton!

  105. avatarAbdullah Cakmak says:

    Hai dude

    great job i like this 😀
    I hope that people like you multiply..

    thank you…

  106. avatarTjkl says:

    Nice post, save me! THX!

  107. avatarRodolfo says:

    I would register if necessary.
    I want to thank you for the tutorial in cmd and why should i even go there

    Thank you

  108. avatarMarcelo from Brazil says:

    Many thanks, you’ve saved my day!!!!!

  109. avatarLukas says:

    Thanks a lot man , it did work for me haha , I was getting the ” unable to copy ” error , then I used your steps plus disabled the WUDT to format my USB creating a new register in regedit and it finally creates my Win7 Sp1 usb copy :)

  110. avatarHurfdurf says:

    Thanks a lot. You’re a life saver!

  111. avatarCargo Cultist says:

    Michael, you’re my new god.

  112. avatarFrozen says:

    If you are displeased with the Microsoft tool, try the Win To Flash tool from:
    it works flawlessly for creating a boot-able Windows install usb drive. It also supports other versions of windows like Vista and XP.

  113. avatarMark says:

    Worked. Many thanks for sharing this.

  114. avatarclea says:

    Thank you, found this post by googling, and it solved my problem.

  115. avatarChristian says:

    Michael, thx for sharing! Worked like a charm!

  116. avatarserkan says:

    cool verry thx mate

  117. avatarYuan Yuan says:

    Thanks, the post stopped me from buying a new USB stick.

  118. avatarAtif says:

    Thanks for saving my lot of money which I am going to spend on more DVDs and USB stick.

  119. avatarDmytri says:

    Greatest! Thanks alot Michael. You not only saved me a lot of time but also $10 on DVDs.

  120. avatarsanso says:

    Dude… _this_ was the best tutorial in a while. Was nearly rippin my hear out. Dunno what happend, suddenly my stuck refused to accept the .iso
    After your instruction it works fine again! Thanks a lot!

  121. avatarJ-lihis says:

    Big thanks, tried and tried and tried until found this site.

  122. avatarsenky says:

    thanks a lot. Great work man

  123. avatarAsh says:

    Used HP utility and it works Great now… Great post.

  124. avatarsanchonx says:

    Thanks so much for the clear and informative post, this solved my problem!

  125. avatarJairo Ramírez says:

    I had the same problem. What was strange is that I had installed Win 7 in other computer using the same USB and ISO file; and that I could still do it with another USB. So I formated, checked for errors in the drive, etc. and nothing worked. Then I found your article, and the solution, with the plus of a satisfying explanation of the problem. Thank you very much, my friend!

  126. avatarlostcitizen says:

    Worked like a charm. thanks!!!!!_

  127. avatarTave says:

    Thank you very much!

  128. avatarToni says:

    The same problem exact.
    Works perfectly. Fixed.

  129. avatarCireme says:

    Thanks a lot! That was really helpful.

  130. avatarJohn says:

    Thanks, greetings from Brazil.

  131. avatarStefan says:

    Thanks a lot for posting this! Works fine, had the same “unable

  132. avatarLaurentiu T says:

    Perfect! It works perfect! Thank you very much! That was really helpful!

  133. avatarFatih S. says:

    Thanks! This solution worked perfectly!

  134. avatarANGGA says:

    Hey, This is totally works! Thanks a lot!

  135. avatarTrueill says:

    Thanks mate. I just bought my USB drive and was gonna return it thinking it was no good. But it totally worked.

  136. avataradam says:

    Thanks for this soloution to a very annoying problem :)

    have restored my usb stick to work as it should, it worked from new but i dont know what i did to break it.

    thanks again

  137. avatarWally says:

    Thanks man!!

  138. avatarNecolas says:

    Microsoft is so messed up they can’t develop a simple tool that uses the command-line they created to install an OS they also created IN the environment they created!! 😀 lol

    thanks man, u saved my day…
    i was right to suspect Microsoft and search for the solution online…

  139. avatarThomas says:

    hello. just tried to do this and i still get the same error. any ideas? bugged Iso or actualy my usb stick done its share of work for this lifetime?

    thanks for a great post.

  140. avatarChris Smith says:

    Thanks – this worked perfectly for the Windows 8 developer preview image preparation as well. Much appreciated!

  141. avatarDarren says:

    I could not get this to work, I kept getting the same error. So I used this:

    Where it asks for your iso type, scroll way down to the bottom where it says Windows 7 and click that.

    Follow directions. Wait. Boom.

  142. avatarChad says:

    Worked! Every drive I tried to install the windows 8 pre-release refused to work. I tried 3 different drives and kept getting errors. As soon as I tried this method it finally worked. I am now installing Windows on my tablet! It’s odd that Microsoft never added the clean option to that program.

  143. avatarBrodie says:

    Thanks, this worked for me.

  144. avatarrigidkitchen says:

    A big thank you – first result on google, and worked. Much appreciated.

  145. avatarjesus says:

    maestraso me solucionaste la vida muchas gracias

  146. avatarmurgfisch says:

    Thanks, it works perfectly. After hours “googleing” the first good advice.

  147. avatarchuck says:

    10x man! work like a charm

  148. avatarKevin says:

    Mate, I’ve just got to say, this saved my butt. I am trying the same tool with Windows 8 Consumer Preview and couldn’t figure out why it won’t copy. Thanks!

  149. avataruser says:

    when i type list disk it show only my pc disk and there no usb why is this happening?

  150. avatarArpadarpa says:

    You saved my day. THX! :)

  151. avatarBranimir Bonev says:

    The clean command really did the trick for me. Thanks a lot!

  152. avatarboris says:

    Thanks a lot! Helped me out. All the good for you!

  153. avatarAmir says:

    Thanks a lot.just solved my problem.appreciated.

  154. avatarNot Sure says:

    Saved the day! Thanks a lot. I’ve used WUDT a few times before and it worked, then all of a sudden it didn’t. I was driving myself crazy trying to figure out what was wrong… I’ve formatted and reformatted to no avail. Then I came across this post and all the positive responses so I had to try it.
    It worked, thanks again.

  155. avatartony says:

    thank you micheal.

  156. avatarAsif Khan says:

    thank a lot bro it worked for me
    you rock

  157. avatarThomas says:

    Thank you very much for this! It was quite helpful ^^

  158. avatarA humble fan says:

    Problem solved! – thank you a bunch! And wow.. What a crucial bug in WUDT..

  159. avatarcrysis2006 says:

    Thank heavens I found this article, just like one of the guys here said about plugging the pen drive in the xbox 360 it’s true. I had it in when I was having a Gears of War 3 marathon between two places, so I used my flash drive for my saves. When using this tool to use it for WUDT, it just would not budge. This guide did the trick, but I did have to use the HP USB Format Tool since even DISKPART was telling me “Well your USB is in a pickle right now so…NOPE”.

    But after using the HP tool and then WUDT, life was good again. My laptop is finally ready for a trip to Windows 7!

    MANY thanks for the guide and to the peoples comments with helpful pointers!

  160. avatarJanio says:

    Tank you so much, man. You save me.

  161. Thanx a lot . btw. i killed the autostartprocess under avirafirewall and after that it works perfectly. MANY MANY Thanx again and have a good day

  162. avatarDammer3 says:

    Thanks I was about to bash my head into my screen trying to set up a boot drive to throw some SSDs in!

  163. avatarJussi Palo says:

    Thanks, your instructions helped.

  164. avatarAret says:

    Avira was the culprit for me as well.
    Just disable the real time protection by right clicking the icon near the clock and you’re good if that’s what is causing it on your system.

  165. avatarRoy says:

    Thank you very much… :)

  166. avatarjarno says:

    Thanks :) It worked for me also.

  167. avatarJohnO says:

    Greetings, and thanks for the instructions–they were awesome for a computer-illiterate person! After completing the file copy, I got a message saying that the files was copied…”however, drive is not bootable”. Hmm… any suggestions? I’m hoping to install W7 to my new SSD. Thanks!

  168. avatarVinay says:

    thank you sir

  169. avatarNibbels says:

    Hello, In my case Antivir blocked the “autorun.inf” that did prevent this MS-Tool from working.

    I also did format my USB to Fat32 first.

  170. avatarPaschalis says:

    HI! I got a problem: list disk doesn’t show my USB Stick.
    When I enter command list volume it’s there. If it doesn’t show in the list I can’t select it and other subsequent commands won’t apply. Does anyone know what the problem is?
    Oh yeah, almost forgot. My USB stick is Kingston DataTraveler 4 GB. I’m running WinXP Sp3.


  171. avatarTrend AV says:

    For me it was my antivirus software. The WUDT log file was filled with this message: “Error during backup., Usb; Access to the path ‘X:\autorun.inf’ is denied.”. I disabled my Trend Micro AV and it worked like a charm!

    The logfile can be found @ Users\\AppData\Local\Apps\Windows 7 USB DVD Download Tool\Log

  172. avatarVince says:

    Thanks so much! :)

  173. avatarAnuvrat1 says:

    thnx man it worked

  174. avatarDavid says:

    Thanks a lot for this post! Helped me out a lot 😀

  175. avatarStar says:

    I used bootsect /nt60 X: /mbr /force

  176. avatarPaschalis says:

    1. My AVG antivirus is turned off.
    2. Format with FAT32.
    3. Run BOOTSECT X: /nt60 /mbr /force
    4. Tried Acronis Disk Director to format & modify partitions.

    Above steps have been tried and still DISKPART didn’t show my USB stick. Therefore, I can’t proceed with CLEAN command.

    What seems to be the problem?

    Please help. Thank you.

  177. avatarLuke Frost says:

    Brilliant post. Had this exact problem, knew it couldn’t be the USB drive or the ISO. Originally tried formatting the drive through the GUI format utility built into Windows, but still didn’t work.

    Couldn’t work out what was wrong.. This worked perfectly, thanks!


  178. avatarkirilos says:

    Thanks a ton,helped me out when i thought i was doomed.
    Great job.

  179. avatarMr. nice says:

    deactivate the Virusprogramms@start the Windows 7 USB/DVD

  180. avatarTeodor says:

    Oh great! I was getting desperate with my flash drive, having tried to burn an image of windows with the Windows 7 USB/DVD tool countless times. Your method works like a charm!

  181. avatarT williamson says:

    wow, can’t believe this solved the problem. It was a great find.

  182. avatarVali says:

    Thx Dude, it really was time for my netbook to get his Windows reset :)

  183. avatarCorey says:

    Thank you for this… You should make this known to Microsoft because I was on the phone with tech support for 3 hours talking to multiple “experts” and none could figure out why this was happening… One of them did explain how to clean the drive and stuff which I already knew how to do anyways.. My only question was why it KEPT recorruing… They don’t know that if you use the drive in an Xbox 360, you need to go through these steps in order to get it to be used by another program created by them. Cross compatibility between Xbox & Windows sould be pretty close when handling things like “Formatting” — Anyways, thank you for finally making it clear to me what was causing it at least.. :-)

  184. avatarjoseph says:

    thanks! this works every time i need it. i should probably bookmark this for next time.

  185. avatarRaj says:

    Thank you for whoever made this tutorial! saved my day! God Bless you.

  186. avatarpete w says:

    flawless victory

  187. avatarManikandan says:

    hey dude.. it worked.. thanks for sharing this..
    thank you very much…

  188. avatarFedor says:

    Thanks, it works :)

  189. avatarAmnesiac says:

    This does not work for me.

    ISO is fine, USB stick is fine, disabled AVG and used the command prompt guide, everything in it’s right place but I’m still getting the same error message.

    Perhaps it’s just one of the times where I simply have to give up?

  190. avatarSean Peterson says:

    This article has saved me considerable head scratching, thanks!

    Haven’t dabbled in command prompt shenanigans in a fair while.


  191. avatarLuke says:

    Hi Rene,

    i did everything, not working, so I tryed to disable my Antivir, and now: WOKRING :)

  192. avatarEmceeb says:

    Thanks. Worked like a charm

  193. avatarJeiyaraj says:

    Greetings from Malaysia!

    Mike, I don’t know about the issues that the others were facing. I was just looking for a way to install Win 7 from a thumb drive & I stumbled across your article.

    I tried the steps u mentioned, & it worked like a charm, no dramas at all. I’ve just completed the stages up to the point where you unpack the contents of the ISO file to the thumb drive. So far, so good. Now, I’ll try to install Win 7 on my other computer with the thumb drive. I’ll update the results whether I succeed or not.

    Anyhow, Thanks for your tips up to this stage! Cheers!

  194. avatarHosein says:

    thanks a lot dude

  195. avatarDomenic says:

    Thanks a lot, this works great!

  196. avatartanside says:

    Thanks, worked flawlessly.

  197. avatarSonny says:

    tnx man, I’m currently copying files to flash memory, I hope everything goes fine

  198. avatarStavros says:


  199. avatarJamal says:

    It is not working for me it stops on 97 or 98 what can i do now please help…..

  200. avatartom says:

    you’re awesome man

  201. avatarGordhan says:

    Thanks a lot dear. It worked for me. I am installing on Dell Inspiron Mini

  202. avatarYan says:

    I can’t express my gratitude, thank you really.

  203. avatarfahim says:

    Thanks dude. I was surprised my old stick was working and the new wasn’t. thanks, you saved me a trip to the computer store. precise information with good explanation.

  204. avatarK says:

    Yay! worked!

  205. avatarJoze Volf says:

    Disabling antivirus which blocked autorun.inf worked for me. I am using Avira.

  206. avatarPete says:

    Excellent! Worked like a charm! Thanks for posting.

  207. avatarPeter says:

    THANKS! You saved my night! Win 8 here i come!

  208. avatarRichard says:

    Hey bro thanks it worked :) GOD bless you

  209. avatardarren says:

    Would like to comment that after performing the steps

    “Anyway, here is what you have to do. Launch a command prompt with admin rights and run the diskpart tool”

    You can then just use the Microsoft Windows 7 USB tool – strange, but true! :)

    tyvm for helping me with this issue, I suggest an ammendment to the article regarding the above :)

  210. avatarH says:

    Thanks a lot for that trick it works for me

  211. avatarF4b14n says:

    Thank you very much for posting the solution that would otherwise take me too much time to solve myself. +20 to you Michael!

  212. avatarLordDiego says:

    Thanx man! As always, find the solution from Microsoft problems elsewhere. Good for you Michael!

  213. avatarBen says:

    Did not work for me – same old *we were unable to copy your files* message

  214. avatarTomas says:

    Very good solution, thanks :) Saved me another two days of trying :)

  215. avatarvan says:

    thanks!! this worked for me as well! i guess my “verbatim” brand 8GB usb is considered a cheapo haha.

  216. avatarfsgdfgbdfg says:

    Thanks, you rock!

    I was assuming formatting the usb drive with the panel control -> somethingPartitioner was enough.

  217. avatarmanish says:

    thanx a lot man
    it did work
    i had a nrg win 7 image
    converted it to iso using poweriso
    then used win7 usb tool to create a usb bootable dev

  218. avatarbob says:

    thanks for your article
    it avoided wasting a lot of hours investigating on the problem…!

  219. avatarjeff says:

    please help,i input the wrong disk number and my 700G files were deleted, is there a way i can retrieve them? thank you in advance sir.

  220. avatarRyan says:

    Fantastic advise, thank you.

  221. avatarEthan says:

    it works !!! thank you

  222. avatarSeongjun says:

    Thanks!! It solves my problem. Perfect :)

  223. avatarGreg says:

    This worked for me – thanks for posting :)

  224. avatartwist says:

    this is top :) i was close to buy a new stick
    thank you very much

  225. avatarthiago exterkotter says:

    thanks a lot!

  226. avatarRanveer Singh says:

    This seriously helped me a lot..!! thankyou you brother..!

  227. avatarMK says:

    Your instructions worked on a Sandisk Cruzer 16 GB whereas the MS tool did not!

  228. avatarCacus says:

    Worked perfectyl! I Thank you very much!

  229. avatarReg E Barclay says:

    Thank you, my good man, the advice you provided was accurate and successfully resolved my issue. It seems that the Microsoft provided tool is unable to cope with drives >32GB, as it will not format them with the FAT32 partition table. Manually creating the boot disk using NTFS was the solution. Your guide provided me with the missing link; the bootsec.exe step was one that I had missed.

  230. Thanks alot dude! That did the trick!

  231. avatarGus says:

    Unfortunately, the disk part did not work either. The format quick fs=fast32 resulted in a incompatible file system error.

    Simpler solution for me: Use Windows Explorer to format USB Stick with FAT32 (which works interestingly), then start Windows Download Tool again. Now works fine.

  232. avatarDustin says:

    Thank you, sir! The Windows USB Tool was giving me fits but this simple fix got the ball rolling.

  233. avatarGopal Bhat says:

    Thank you very much.
    I was having the same problem and your method sorted it out :)

  234. avatarAntonio says:

    Thank you very much. Now the program is working perfectly and it’s able to copy my windows 8 iso into the pen drive!

  235. avatarNICHOLE says:


  236. avatarKoray says:

    Thanks a lot for this valuable information, you saved my day!



  237. avatarAtif says:

    I have done all above method on 2 usb with 2 Iso files. but both of them were unsuccessful for me . i have win8 iso file . i dont know what is problem , i have changed the USBs , any help please

  238. avatarAmin says:

    Thank you very much! It was helpful for me.

  239. avatarDavid Bock says:

    Thanks for that great solution.

  240. avatarRené says:

    Thanks for the commands. The reason why this error message appears at my installation was that avira antivirus tool blocked the autorun.inf of the windows iso-file I tryed to copy to the USB stick. Unchecking this function in the antivirus tool made WUDT doing its job. 😉

  241. avatarSeán says:

    Thanks a bunch. Worked perfectly.

  242. avatarKuroneko says:

    Works perfectly.

  243. avatarzib says:

    did the job. nice work. thank you very much!

  244. avatarDani menur says:

    Thank you very much… Worked perfectly

  245. avatarDaniel says:

    Just deactivate the “block autorun” function of you firewall and /or anti virus software. i´m using avira antivir as antivirus program and had the same problem. after deactivation of the block autorun function it just went well.. cheers

  246. avatarsohan says:

    Flawless victory! Thanks a lot dude

  247. avatarNopez says:

    My drive was formatted with the NTFS file system, and this guide steps you through formatting it as FAT32. I guess the Microsoft USB tool is only FAT32 compatible.

  248. avatarluis says:

    Thanks! worked great for me too.

  249. avatarbenson says:

    Thank you. Though I’m a bit confused about the magic commands(diskpart, xxx, xxx)

    Anyway, this method indeed works.

  250. avatarMatt says:

    Thank you very much good sir!

  251. avatarDade says:

    Worked perfectly. Thanks!

  252. avatarCiB3rX says:

    Thanks man.. this did the trick 😀

  253. avatarRyan K says:


    Brilliant, I was getting the same error, I followed your steps to clean partition etc. then I used the tool again and it began to copy, thanks alot.


  254. avatarJ B says:

    Thanks for a very helpful post

  255. avatarStathis says:

    Thank you

  256. avatarPaul says:

    Thank you so much, it worked!

  257. avatarMichael says:

    Very surprised the ‘clean’ command has no GUI access anywhere within windows. Obviously there shouldn’t be anyone fiddling with it willy-nilly, but what common consumer goes into the Disk Management within control panel anyway? Should have been added.

    Anyway, thanks a bunch! Worked for me.

  258. avatarJack Hsu says:

    Thank you, appreciate it very much!

  259. avatarNick says:

    You sir, are a genius, thank you! :)

  260. avatarCameron Hudson says:

    Thanks for this!

  261. avatarAris says:

    Hi Michael..
    My USB stick not detected in the command prompt after writing “list disk”. Iam using windows xp sp3
    please help me. thank you very much

  262. avatarAR says:

    Thanks, saved my day. :)

  263. avatarJ Lapham says:

    Good grief – thank you for this….just saved me an hour of futzing around.

  264. avatarKlemen says:

    Thank you, great tip.

  265. avatarTanel says:

    Thanks :-)

  266. avatarMarco says:

    My problem was the AVIRA Virusscanner. Disabling that solve the problem.

  267. avatarChris says:

    This did the trick for me! thanks!

  268. avatartata says:

    not working with my kingston data traveler 101 8gb …

  269. avatarWired Warrior says:

    Thanks brother. Another brick of the wall torn down, and I’ve almost got a clean install going. Peace.

  270. avatarRichard says:

    I join in with the thank you’s!

  271. avatarDhiman says:

    Thanks, it works. But I have a strange problem.. My have 8GB USB drive. Earlier it was showing 7.45GB usable. but now its 7.43GB usable after using diskpart. (* I had used “clean” command). Does anyone knows why?

  272. avatarLemes says:

    it didn’t work for me :(

  273. avatarsim says:

    thx, it works for me :)

  274. avatarEser says:

    Thank you, worked fine for me :).

  275. avatarlemycanh says:

    Works great! tyvm!

  276. avatarhoho says:

    thanks a lot :)

  277. avatarKroco says:

    Really thanks bro it worked really well you save me a few hours in web =)

  278. avatarrm says:

    Excellent! I thought it was vmware causing issues at first!

    but this now work in virtual machines too!

  279. avatarbradford says:

    Thanks! This fixed an issue for me trying to get Windows Server 2012 on a bootable USB drive.

  280. avatarAnonymous Coward says:

    3 years later and this is still a useful tip. Thanks!

  281. avatarGeorge H says:

    I guess I am one of the unlucky ones. I tried your diskpart steps, I disabled my virus checker, I installed the HP formatter (discussed in the comments) and I even installed Rufus. Nothing works.

    Nothing crazy about the ISO. It comes from MSDN downloads. I even downloaded it twice.

  282. avatarAbhishek Kumar SIngh says:

    HI, I have done the booting of computer before with the same usb drive. Now i am having this error problem and i have done all the step you have written. Still, it does not work for me. Please help me.

  283. avatarAbhishek kumar singh says:

    Any one trying to copy .iso file to USB and having problem then try to disable the antivirus which helped me to copy. sshhh at last I could copy.

  284. avatarGeorge H says:

    Here’s an update to my post above. The WUDT kept failing with 99% completed. After giving up, I happened to notice all of the files were happily waiting on the USB drive. Just for fun, I ran the setup to see what would happen. Setup completed successfully!

  285. George, yeah never trust an error message. Sometimes the message is the error. 😉

  286. avatarSamy says:

    iT’s Done, Work Perfectly
    Thank You So Much


  287. avatarSamih Qabaha says:

    Thanks too much :)

  288. avatarMWH says:

    thank you very much.

  289. avatarChris says:

    Thanks Michael, works like a charm!

  290. avatarChris says:

    Thanks dawg. Worked a treat!

  291. avatarwibble says:

    That fixed it – wouldn’t work with a USB3 stick, never had a problem before. Many thanks :-)

  292. avatarEduardo says:

    TKS!! Work for me!!

  293. avatarTim says:

    Nice it works great! Thinking my usb device sucks, but this is the solution!

  294. avatarMatt says:

    Thanks! This did the trick… you’d think Microsoft would just make a tool that actually works to let you install their software.

  295. avatarJustin says:

    Thanks a lot Michael! This worked perfectly. I had the same problem as the first poster Luke, I had used a Kingston G2 flash drive several times with WUDT but today it just would not work. After following your instructions it worked the first time.

  296. avatarScott says:

    Works like a champ – thanks!!!

  297. avatarEdgar says:

    It worked, thanks !

  298. avataryasamoka says:

    Thanks! This worked wonderfully!

  299. avatarandrea says:

    THANK YOU, THANK YOU, THANK YOU!! I could say it a MILLION time over THANK YOU!

  300. avatarravi says:

    If WUDT doesn’t work then check this,

  301. avatardhanabal says:

    Thanks… its working now…. :-)

  302. avatarthanks says:

    I’ve got the same error, and this diskpart command really saves my time. thanks man!

  303. avataremilian says:

    great piece of information. it works perfctly now.
    best regards!!!

  304. avatarSorush says:

    Guys make sure you have disabled your antivirus!
    I am using Avira Free antivirus and when I perform the procedure, the program become failed! After disabling my Avira the program done its job perfectly!

  305. avatarDTruck says:

    You sir, are a gentleman and a scholar. I couldn’t figure out why my “formatted” usb drive would not copy an image over. Works perfectly now.

  306. avatarClaude says:

    Disabling the antivirus (Trendmicro Officescan) solved the problem.

    Thank you.

  307. avatarDavid says:

    Works Fine, I also had to deactive Avira!

  308. avatarmichael says:

    Thx this helped me out

  309. avatarChai says:

    you are the best. Thanks a lot

  310. avatarv0m1t says:

    this method worked to get around the error message, thanks a lot!

  311. avatarmonkeh88 says:

    this worked perfectly

  312. avatarpunwin1 says:

    Thanks; this got me sorted after a few frustrating failed attempts to create an installer USB stick.

  313. avatarSaz says:

    Didn’t work for me. Manually copying the contents of the DVD after using Diskpart does not create a bootable install USB drive. I used UltraIso It prepared the drive in about 4 minutes and it works perfectly.

  314. avatarDario says:

    Thank you so much,this solved my problem! 😀

  315. avatarSnitch says:

    Great article… worked like a dream.

  316. avatarNoah Dionisio Silveira says:

    I was wondering it was a problem with my pendrive..
    Working now.. Thanks a ton.!

  317. avatarArild says:

    Thanks. Worked great after following your guide!

  318. avatarDaniel says:

    Like a charm, no fuzz at all. Thanks

  319. avatarGyber says:

    Thanks it worked!

  320. avatarsteve says:

    Worked like a charm!! Thanks!!

  321. avatarwewa says:

    Watch out!
    The WinToFlash utility recommended halfway thru the comments, loads a ton of spyware on your windows even when you choose NO, DO NOT INSTALL during the installation.
    OptimizerPro, LiveSupport, Search, etc. Use something else!

  322. avatarOposum says:

    Thank you very much. Have tried many ways to format, but after hours of searching only this worked!

  323. avatarsid says:

    I am trying your advice now.. I hope it work :(

  324. avatarNick Jones says:

    Ledge!! Works like a charm. Cheers.

  325. avatarsandeep says:

    Thanks.. it worked for me

  326. avatarMarcio Junior says:

    Thank you !!! Worked.

  327. avatarKyel Calland says:

    Cheers buddy saved me a lot of time and hassle, I owe you a beer!

  328. avatarChase says:

    It worked, finally something does!!!!!
    Now I can reinstall Win7, then I hopefully won’t get the bootstrapper error message when trying to load MS Office 2013.
    A Win 7 reinstall, is my last resort after reg fixes and uninstalls failed to allow a successful Office 2013 install.
    At this point without a disc, I was super frustrated when I couldn’t save to the USB, but am happy that someone knows what they are doing and is willing to help others.

  329. avatarMike G says:

    Great fix. I was re-using a USB that was previously used for Xbox save games; apparently more residual data/settings that could not be wiped.

    One tip: run everything as admin mode for this.

  330. avatarftouhi says:

    iT’s Done, Work Perfectly
    Thank You So Much

  331. avatarw says:

    My flash drive and ISO were too large for FAT32, so I input fs=ntfs instead. Win7 tool is working fine now.

  332. avatarSujay says:

    It did not work for me. I am trying to create a bootable USB drive. I followed disk part steps and then tried WUDT. It again gave the same error. WUDT still try to format.

    Can I do something manually instead of using WUDT?


  333. Sujay, you can try Rufus. I also wouldn’t rule out that your USB stick is broken.

  334. avatarMe says:

    Worked brilliantly thx!

  335. avatarmonkon says:

    It works. Thank you so much =)

  336. avatarMars says:

    I’m had the same Kingston DataTraveler 100 G3 8GB.

    After doing the diskpart commands in an elevated command prompt I successfully copied my ISO file using the Windows 7 USB/DVD Download Tool.

    Thanks for sharing this info.
    Greetings from Mars

  337. avatarKyle says:

    Just followed this and worked perfect. Like someone posted above, I used the flash drive to boot a Mac OS X. Reason it doesn’t work properly after using it to boot Mac OS X is that Mac drives use GPT (GUID Partition Table) instead of the standard MBR.

  338. avatarHristijan says:

    Thanks for the great post! It worked fine!

  339. avatarOggemista says:

    Thx but this doesn’t work for me because the diskpart utility tool wont “see” my USB removeable flash drive I get to “list disk” and only the combined space of the 2 internal HDD’s are showing but If I use list volume then all 3 drives show

    I am using windows xp professional, is this the core of the problem?

  340. avatarzydmeister says:

    works like a charm!!! 😀 😀 😀

  341. avatarshankar says:

    Thank you so much.

  342. avatarJordan says:

    Worked perfect. Thanks so much!

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