If I'm not mistaken, ISE (=Integrated Storage
Element) for DSSI
just means "disk", and it may be cabled internally, IE with ribbon.
There are ID selectors that go on the disk _housings_, but they may
be skipped and overridden with an on-disk jumper block, at least
with most RF series. Any DSSI disk should work The RF31 starts at
under 400MB, the RF74 ends at under 4G. DSSI disks are getting rare,
but are still do-able on eBay. I've got some too.
This mass storage bay of this cabinet has a backplane full of somewhat
centronics-like connectors. The carriers can hold one 5.25" full
height drive, or a pair of 3.5" drives, and have extrusions to hold
them into the card slots in the bay. They also have the ID plug
sockets in the front of them, as you describe.
If I can find the carriers, it'd be nice: lots neater, less tracking
down of cables and reengineering the inside of the cabinet.
De