I have a load of mp3s on an external usb hard drive. Before our office move I backed these up to another usb hard drive. At the new office the original disk was giving that distinctive clicking sound that indicates death. I started copying the other disc but then it too stopped working. I took out the disk from its enclosure and attached another usb interface adapter, but that didn't work either. Next I opened up my four year old desktop computer, hoping that it would have a sata interface. The discs weren't sata but I was able to pull out a dvd driver cable and attach that to the disk (see picture above). Now Windows saw the disk and chkdsk ran. Finally I have been able to spend the last two days copying files off the disk using rsync.