Hey all, first off I've never experienced a hard drive failure of any kind before so I'm not sure what the symptoms are. My external drive had been working just fine for over a year, and then just today it doesn't appear that my iMac or macbook will recognize it. The drive starts up and everything just like before and sounds like it's working, but like I said, nothing appears. Is this a hard drive failure? For what it's worth my other 2 external drives DO work on both machines.