Can't erase HD

I want to erase and reformat a hard drive that did first did not survive a power outage, then returned; at that point I reformatted it and partitioned it for backup use. To investigate another problem, I took all drives offline, then rebooted expecting use of the backup hard drive as usual. However, allthough Disk Utility sees it, it does not appear in Finder and is no longer partitioned. DU thinks it is blank. I gave up on trying to mount and chose Erase in DU but get message: Disk Erase Failed with the error: Resource busy. Can anyone explain this/suggest a way to regain drive's use?

Maybe you can find something here that applies?
http://discussions.apple.com/thread.jspa?threadID=1503696

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