not able to format USB drive

Wed Dec 12 12:32:53 UTC 2007

Hello everyone,
             I got a USB drive from my friend.It has a directory called TASM
and a file autorun.inf.I deleted both of them.But on mounting the drive
again the 2 files reappear.Also on formatting the disk the 2 files remain
there.I am not able to remove them and the disk has become
unusable.Whatshould I do?
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