Hi, How can you ID which is ATA Bus 0 ? Terminal? Open Firmware? Disk Utility? Look for label on logic board connectors? Other?

Detail:

After the "Ultra ATA-100" bus started failing years back (with errors), moved the HDDs to the two Ultra ATA/66 bays.

Never had occasion until now to start in FireWire Target disk mode. And it won't work (just powers down).

When searching, keep finding a line "Make sure the target computer has an ATA hard drive on ATA bus 0."

Hmmm. Simplest explanation might be that the ATA-66 isn't Bus 0... But darned if I know how to tell.

Profiler simply says "ATA Bus". Disk Utility doesn't have an explicit label for it in the info window. For the 2 HDDs just get:

Disk Identifier : disk0 (or disk1)

Connection Bus : ATA

Connection Type : Internal

Connection ID : Device 1 (or Device 0)

Device Tree : mac-io/ata-4@1f000/@1:0 (or @0:0)

Is it "encoded" in the Device Tree? The first @1 ??

Not open firmware savvy, but when tried to boot from there using "target-mode" command got:

can't open disk

can't find any units

TARGET-MODE unit failed

Thanks for any info.