Cannot delete files

 I bought an Ixpand 64gb to use with my IPad Air. I loaded films onto it and all was working well, then came the time to delete them. No matter what I try the films etc will reappear on the drive even though they have been deleted. Any suggestions?

Cheers in advance

Chris.

have you tried deleting the file using a computer? do you get any error like disk is write protected?