cyclic redundancy check on thumb drive

I'm trying to backup a set of files to a thumbdrive and while copying the program (second copy 2000) stops and gives me a "cyclic redundancy check" error. "Data error (cyclic redundancy check)"  any ideas on what might cause this problem and how i can fix it? I'm trying to copy the same set of files onto about 100 65mb thumb drives, so far it's worked on 5 out of 7...
jimwest56Asked:
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SysExpertConnect With a Mentor Commented:
The flash RAM may indeed be bad.
I would consider running chkdsk or even reformatting ( Although that has been known to slow down transfer speeds ).

I hope this helps !
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RWrigleyCommented:
Have you tried the same program with the same thumbdrive on a different computer?  It's possible that something is flaky with the usb subsystem.
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jimwest56Author Commented:
yes i tried and i get the same error.
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RWrigleyCommented:
Then it's probably bad memory.
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kkransCommented:
This can happen if a drive is pulled out before all the writes had completed to it.

This can cause indexes to be compromised and the disk can not find all the blocks on the drive. It is important to stop the device prior removal

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