System: MacBook Pro 13" 2.26 2009 Model OS: 10.6.4 (used the combo updater) Device: FireWire800 drive (non-raid, non-dual drive) Single drive. Both drives are HFS+ (standard OSX formatted drives). Both drives are 2TB drives as well. I get this when trying to transfer my back up DVDs to another drive/volume. All drives check out fine, all cables are good. I'am able to transfer the other DVDs just fine. This one for some reason wont transfer to another drive, I can't compress it into a ZIP or even duplicate it on the same drive itself. It's a 2-disc DVD that totals 12GB; I can open it in HandBrake and convert it just fine... The weird thing is this came from a different drive a few months ago so I'm not sure whats up with this really. any ideas? Thanks!