Hello, I have an 8GB flash drive [MS-DOS (FAT)] that I use regularly for documents and movies. Lately every time I tried to transfer a movie into it I would get a message that said "some of the contents could not be extracted". I then decided to reformat it on my mac since that issue kept on happening a lot but when I used the erase tab in disk utility it would say "could not write to the last block of the device." Then I put it in my desktop (Windows 8) and tried to reformat it there but I got another message saying "the disk is write protected." I looked up different ways to do it but now the computer acknowledges it's there but can't do anything to it. Any more suggestions will help at this point.