My computer is a 2009 Macbook pro. I have a 1 Tb external hard drive (wdbabv0010bbk-00) that as recently as a week ago I could access just fine. Now, when I plug it in, the hard drive boots up, the light starts flashing, and I can hear the internals spinning, but the device does not show up on my computer. When I try to back up using time machine, I get the message that the backup disc is not available. This is purely a backup for me, but given the age of my computer I'd rather not wait very long if the hard drive has indeed crapped out. Ideally I could keep using this for a while as a backup, but I'm not trying to push my luck. Any help would be appreciated, thanks!