WD external harddisk not recognised after failed format

Hi folks,
So I have an old WD 320GB harddisk I pulled from an old windows acer 5535 I wasn't using, I tried formatting it to OSX journaled so i could use it to back my friends mac up. The drive was initially readable and showed my windows 7 and files I had on there.
I left it to work for a couple of hours, when I came back it said it had failed. I have since read about the 'correct' way to format this drive.
The drive no longer shows up in disk utility or in system profiler under USB.
I'm plugging in using a USB SATA enclosure.
The mac I tried to format on is an old white unibody running 10.6.8, it's not recognised on my imac running 10.8.4.
The disk spins and the green light on the enclosure is lit.
Have I killed it or can I save it with some more powerful software?
Cheers!
Karl,

Yes i thought this too, problem is my old acer's GPU is problematic and will only work now and again, I think it needs re-flowing. I'll put the hard drive back and try to get it booted up and see what happens. I'm guessing it's no good now anyway after the mac tried to format it for a while.
Will report back.
Karl.

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Bump
Joey Goldstein wrote:
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Message was edited by: Joey Goldstein

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