I had backed up some stuff onto this drive. I tried to access the files to put them back on a machine, and all the files say "access denied" "make sure the disk isnt copy protected"

Whats going on? How do I access the files? Some older folders will open, some wont.

Please help....emergency!

Computers & Internet - LaCie - 250GB Ext/Firewire 7200 250 GB Hard Drive