External hard drive I have an external disk that I have not used in a while (an older G tech with FW800 ports). Recently I plugged it in and my 2008 iMac (10.8.5) reported, "The disk you inserted is not readable by this computer." If I leave the external disk in, my iMac won't get past the white screen with the Apple logo on boot up. With Disk Arbitrator, Disk Utility sees it but reports that it has zero bytes and the Verify and repair disk options are greyed out. DiskWarrior does not see it and if I start Disk Arbitrator up first and then Disk Warrior, everything but the cursor freezes and I have to hold the power button down to restart the computer. I tried listening to the disk on start up and it makes a fan-like noise and has a slight vibration but I don't think I hear the click-ity click noise of the head reading the drive. Any tips on trying to salvage its contents?