SanDisk Cruzer Blade 16GB write protected error

>The only time I’ve encountered it it was a Windows 7 Sharing option set to Read Only.  An easy problem to fix. 

>But when it carries over difference OSs it’s a different problem and no idea as to the solution, or the cause.

My 16GB SanDisk Cruzer locked up (going into “write protected” mode) in the middle of a large file copy.  I have XP

and the flash drive has never been hooked up to a Windows 7 system.

I’m guessing that this is some sort of hardware glitch that SanDisk doesn’t want to admit to for some reason, probably because they don’t have a fix for it and/or don’t know exactly what is causing it.