I never had any issues with the write-protected issues. If I did, I would have followed the suggested methods.
I know that this Website is an old discussion thread. It does not hurt to try those suggested methods, if you are comfortable working with Windows Registry Editor. Just make sure you keep a backup copy of the Windows registry.
http://www.techrepublic.com/forums/questions/usb-flash-drive-is-write-protected-how-do-i-remove-it/
Last, I would not attempt to return SanDisk product until I know for sure that the product IS defective. Sometimes it is best not to cast blame on the company until you find a common thread among other users of the same problem.
I hope this helps resolve your problem.
Best of luck!
