> SCA drives are un-terminated, the termination is provided by the SCSI
> backplane,

Well, depending on the enclosure.

> the ID is provided by the position on the SCSI bus.

This is not true - or at the very least, is not always true.  I have
one machine with two SCA drive bays; one is ID 1, the other ID 3, in
each case regardless of what other IDs may be present on the back-panel
connector or whether the other slot is populated.

As I understand it, the ID is provided by some of the pins on the SCA
connector; if this happens to match order on the SCSI bus that is more
or less coincidental.

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