Migration Assistant vs. Target Disk Mode

I'm trying to migrate an account via Target Disk Mode from a PPC G4 tower with multiple drives. Only one of the drives is showing up (number 2 out of 4) and it's not the system drive. Any idea how I can get the other drives to appear? They do not show up in Disk Utility, either.
Thanks!

Any idea how I can get the other drives to appear?
Change the position of the drives in the computer or use another method. Target Disk mode only connects to the master drive on the ATA 0 bus, and on newer Macs, the internal optical drive.
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