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I have a 2 GB kingston USB stick , the file system became RAW. How can I reformat it to use it again.I have tried many utilities but nothing worked, I'm using windows7.

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What utilities have you tired, and what errors have you gotten –  soandos Apr 22 '12 at 8:32
    
I used Active@ killdisk, and I get "unwritable sector" error –  Alex Apr 22 '12 at 9:00
    
and cmd lines, but didn't work –  Alex Apr 22 '12 at 9:01
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Maybe consider editing your question and adding every detail (rather than posting it as comments). Especially, which command lines. –  slhck Apr 22 '12 at 9:03
    
You should try using the Disk Management tool under Computer Management (right-click on Computer and choose Manage) but it is likely that the stick is faulty and will need to be thrown away. –  Harry Johnston Apr 23 '12 at 5:39
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up vote 0 down vote accepted

Before throwing away your flash drive, please try using an Ubuntu Live CD to delete any partition that may be present and then format it using even disk manager or terminal

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