Tell me more ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I was trying to put the Windows 8 Consumer Preview onto a thumb drive, when I was asked if I was OK with wiping it (I said yes I as it was blank).

I had to sleep my computer during the wiping, and now I can't do anything with my dive.

When I put it into my computer:

Asked to reformat

When I click format disk:

Unknown capacity

In short, the disk never reformats (I get an error message letting me know that Windows was unable to format the drive). Whats going on, and how do I fix it?

share|improve this question
What if you uncheck "Quick Format"? That will do a full format and might clear up the problem. – Jim G. Mar 4 '12 at 0:40
"Windows was unable to complete the format" – wizlog Mar 4 '12 at 0:46
1  
See if this utility cures that problem...alexpage.de/usb-image-tool/download – Moab Mar 4 '12 at 0:48
Post that as an answer, and explain it. – wizlog Mar 4 '12 at 14:24

1 Answer

If you have a Linux live media, use it to reformat the USB flash drive using GParted or other similar software.

Or you could try formatting your drive through cmd. Here is a nice tutorial to do so.

http://www.ehow.com/how_5937471_format-usb-flash-drive-dos.html

A summary of the steps you might use, based on the eHow article linked above:

  • Open a command shell and launch diskpart.
  • Type "list disk".
  • Find the disk number for the one you want to format and type "select disk x" (replace x with disk number - e.g., "select disk 5").
  • Type "clean". This will remove all formatting and partition information from the thumb drive.
  • Type "create partition primary".
  • Type "exit" to close diskpart.

At this point, you can probably try again the usual methods of formatting - either using the format command in the shell or using Windows Explorer.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.