Internal HD disappeared from my iMac Desktop, & System Profiler

I use an iMac from 2011 running Mac O.S. X Version 10.6.8. It contains an internal SSD (the boot drive), and an internal 2TB hard drive called HD2.
The iMac underwent a diagnostic check at the Genius Bar last week, and everything checked out okay.
HD2 has disappeared from my desktop. Restarting the iMac has not brought it back.
The HD2 used to show up under Serial-ATA: Intel 6 Series Chipset in System Profiler, but no longer does.
Disc Utility no longer shows HD2.
Time Machine has been backing up both the SSD and HD2 on 6TB of external storage. But I do not see HD2, no matter how far back I go into Time Machine.
Spotlight searches do not turn up stuff that is on HD2.
I get a "The disk was not ejected properly" message when properly ejecting external drives.
Any idea what is going on?

If OS X iwas installed on HD2, you can start from an install dvd & use 'Restore From Time Machine Backup' with the external as the target. For data files, I'd use TM's interface if possible : try Time Machine - Frequently Asked Questions 17. How can I see my backups, or the Backups for a different Mac?
since it seemingly doesn't show as expected.
http://pondini.org/TM/15.html covers restoring selected items.
Hard Drives do sometimes just stop. no warnings.

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