Did you format them in any way before you started to transfer these files to them.
If the answer is no, then be aware that they are probably formatted as FAT and have a built in file size limitation of 2.0GB.
Where did the original files come from? Ripped from a DVD or purchased through iTunes?
I am trying to transfer my Disney DVD onto 4 x 32gb flash drives and not every file is transferring correctly.
Firstly, they are all mp4 files between 1.5 and 3.2gb each and they have the cover artwork attached (which I did through the iTunes library as I don't know of another way) but not all files are transporting over thoroughly and playing correctly.
If the artwork isn't showing and it is the mpeg logo - the error reads when playing that "QUICKTIME PLAYER CAN'T OPEN "FILE NAME" BECAUSE THE MOVIE'S FORMAT IS NOT RECOGNIZED.
Sometimes, when the artwork was originally there, it looks ok to play and then Quicktime flashes the same error and the artwork disappears to the the mpeg logo.
I am using a MBP on Lion ... Please help