I have some of those in two different makes. Your device might be accompagnied by a Y-cable to tap 5 V supply voltage from the ADB or a 5 volt wall plug, if connected to a not sufficiently powered SCSI bus. You may connect the drive directly to a PowerBook HDI30 (using an adaptor plug) without the tap cable. A terminator usually is not required if the drive is connected to the Mac using no or a very short cable.

This is the fastest and easiest lightweight way to transfer huge amounts of data from one Mac to another distant Mac. Congratulations to this nice conquest!