Elfen said:

I think you can turn the unit on as a SCSI Drive and connect it to another Mac through the SCSI Port and inspect the drive like modern Macs can connect by FireWire Mode, but I forget how that is done.

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You'd need a docking SCSI adaptor to mount the Powerbook in SCSI target disk mode.  The docking adaptors I've had (mainly made by APS) have a switch to allow the adaptor to be used to connect external SCSI drives to the Powerbook, or switch to allow the Powerbook to mounted as a SCSI disk.