PROBLEM: Backup copy won't boot computer

[stevea]

Originally Posted by dnanian

Yes. It's possible you have an incompatible enclosure, or software that runs at startup that's having trouble running on a different volume than the original.

Have you tried installing a basic OSX installation on this drive, and booting from it?

Well, I had hoped making a backup copy would have been sufficient, so this would not be necessary (as SuperDuper is advertised)...

But, your questions/suggestions are helpful... the backup copy is on an ATA card. The ATA card supports startup, though. But, the drive is 250GB, and that may not be supported to startup on my Mac (G4 Quicksilver), because it has a 128GB drive limit on its built-in ATA bus and (afaik) firmware. (The ATA card and its driver extension overcome the limit, but perhaps they must be loaded first.)

I can move the drive to firewire and see if that helps. But, assuming no other problems, it looks like I'm dealing with hardware limitations of my Mac, not a problem with SuperDuper here.
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YAMAHA G-245S