“What can i do”
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Find out who tried to access your files.
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Find out who played a mean joke on you.
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Find out why your USB drive was touched?
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Click the Erase button.
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Write NOTHING to the drive.
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Use any/all of the file recovery apps that I posted here somewhere and see if they will allow you to recover your files.
My 6/2/2011 posting in this thread: http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/repair-files-after-removing-cruzer-edge-USB-from-computer-during/m-p/294199#M4934