Hello, So I've had an Imation 8GB USB drive probably around 5-6 months, so fairly new. But one day my USB drive just doesn't want to receive SOME files, especially big files (I'm talking about 2GB+). The files I tried to copy were movie files and game files, it just suddenly stopped copying them. I tried formatting my USB in different ways. I also tried using the cmd trick, It said that it is not actually write-protected, it's just every time I try to copy certain files it just turns into a useless USB drive. I can still copy word documents, presentations, etc. It's like locked whenever I try to copy things besides word documents and excel and those basic things. Oh! and I also forgot to mention, there is no write-protection switch anywhere on the USB drive.
Do you get an error, when trying to copy bigger files? In general, it is important how big those files are. If they are more than 4 GB, the issue may be file format related, because of the FAT 32 format limitation. However, those limitations should not affect files smaller than 4 GB. I would switch the file format to NTFS and try again. If the issue persists and you have tried the pen drive on another PC, there may be a problem with your pen drive.