External HD suddenly won't show up in finder

I have an Iomega external HD that I've had connected to my iMac for several years now. All of a sudden, it has disappeared from the finder. System Report shows it is connected, but neither rebooting the computer, the HD nor both has caused it to reappear. It contains my iTunes library and iTunes can't find it either. I connected it to my wife's iMac, also running mountain lion, with the same results. I've connected it via firewire and USB. My Focusrite audio/midi interface is connected to my iMac via this HD and shows up, but doesn't work.
I've tried disk utility. It shows, but under the name of the HD, the name I gave it, "music", is grayed out and the Mount Point is "not mounted". Verify Disk says it is okay. Trying to mount it returns the message:
The disk “Music ” could not be mounted.
Try running First Aid on the disk and then retry mounting.
Running First Aid again doesn't change anything. Any ideas? If the disk is dead, can I get my data from it to another disk? 
Kevin

I have an Iomega external HD that I've had connected to my iMac for several years now. All of a sudden, it has disappeared from the finder. System Report shows it is connected, but neither rebooting the computer, the HD nor both has caused it to reappear. It contains my iTunes library and iTunes can't find it either. I connected it to my wife's iMac, also running mountain lion, with the same results. I've connected it via firewire and USB. My Focusrite audio/midi interface is connected to my iMac via this HD and shows up, but doesn't work.
I've tried disk utility. It shows, but under the name of the HD, the name I gave it, "music", is grayed out and the Mount Point is "not mounted". Verify Disk says it is okay. Trying to mount it returns the message:
The disk “Music ” could not be mounted.
Try running First Aid on the disk and then retry mounting.
Running First Aid again doesn't change anything. Any ideas? If the disk is dead, can I get my data from it to another disk? 
Kevin

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