G5 randomly ejecting second internal harddrive 5 mins after startup?

Question

I recently upgraded my G5 from tiger to leapoard to make it compatible with my iphone4. For some reason it has now started ejecting my second internal harddrive containing movies and pictures 5 minuts or so aftr start up. Before that time the drive works perfectly.
The computer is fully updated to 10.5.8.

Answer 1

Do a little at a time and keep your fingers crossed.  You may have to remount and retry several times.  Of course, with it not staying mounted very long, larger files may be problematic.  I would hook up an external drive, copy from the failing drive to the other internal for maximum speed, then copy from the other internal to the external until I got everything off.  Best to get a FireWire external (most useful, but USB is OK) SATA enclosure or drive dock, put a bare drive into it so that when you are done, you can drop the bare drive into the machine in place of the failing drive.
Oh, and one other thing I might try at some point is to shut down, remove and replace the SATA connectors to the failing drive to clean them up and then reboot.  I would not, however, do this until I had gotten the most important files off the failing drive.
Then, once you have done that, you might want to get another couple of bare drives and use something like SuperDuper! or Carbon Copy Cloner (sorry, no handy link in my bad-o-tricks) to clone and keep current backups of the internal drives.  A SATA dock (toaster) might be just the thing, rather than a plain enclosure, certainly faster to deal with when you are swapping multiple drives around.  The linked example is a Quad interface that has actually come down in price the past couple of months.