Upgraded to yosemite and lost a hard drive; how do i get it back?

How do I get a hard drive recognized that was left off after upgrading to Yosemite?

I wouldn't recommend trying to go back to leopard.
So you have a PowerMac or Mac Pro and multiple internal drives?
All your other drives show up?
Was it an older drive? formatted in any particular way?
If you have an external drive case and another mac, you might be able to try that, and see if it spins up. Or just boot up with the door off and try to feel if there's vibration on that drive. 
You could look for trials of Data Rescue, Disk Warrior, Data Recovery Wizard ... and see if these applications will list the drive. They can look at a lower level what is connected to the system than disk utility gives access to. Tough call though without anything showing in disk utility suggesting the drive is still alive but gotten corrupted.
If you know a mac tech, probably not a bad idea to give them a call and see what they advise that you could try yourself. Chances are though that he/she/they just want you to drop if off suspecting a failing drive.

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