I have been working on trying to find out why backup programs cannot validate or restore from Western Digital Drives using SATA on Western Digital Drives drives. They appear to work fine using Firewire and USB. But Western Digital SATA controllers inside the drive overheat inside case causing them to shut down via internal thermal control. I discovered this by placing a fan next to the drive and setting it on it's side to allow air flow. This is a serious engineering flaw. I am going to post this information on the experts exchange website so others are informed. This is a serious error that should have been detected long ago and the device should have had a fan installed inside it. Or at least offer a "mating" external fan unit.