The Mac's controller is SCSI ID 0, so you'll most likely need a jumper on ID 1 or ID2 as the Adapter/Drive's identifier on the chain.

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Wrong!

Mac itself (initiator) is always ID 7. Internal drive that consists System folder traditionally is set to ID 0.

So, Brooklyn, if this drive is your only drive, no jumpers on ID pins are needed.

BUT, unless your SCA adapter has onboard terminators, you have a problem.

SCA drives do not have any kind of onboard termination, but your SCSI chain in SE/30 needs to be terminated. Solutions to this problem would be:

1. Use different internal cable (with one extra connector) and use 50 pin terminator that attaches to that cable.

2. Use 'pass-thru' terminator (see below) on exsisting cable.

http://www.cs-electronics.com/sca-adapt.htm

http://www.cs-electronics.com/scsi-term.htm