SUMMARY: Anyone got the jumper info for a Seagate ST31200WC?

From: Brett Lymn (
Date: Thu Jun 08 1995 - 09:07:55 CDT

A day or so ago I sent out this message:

> I have a SS20 that came with a Seagate ST31200WC 1Gig drive
>internally. Due to various circumstances the drive got removed and
>external ones used instead. Now we want to install the ST31200WC back
>into the machine but find that the SCSI ID's on both the snazzy
>internal connectors clash with the two external drives (id's 1 and 3).
>Anyone know how I can change the ID of the internal drive to something
>else? I have tried trawling Seagate's WWW page ( but
>the graphic of the drive I am looking for is not available :-(
>The drive is a Seagate ST31200WC (If you hadn't caught that by now ;-)
>with one of those integrated drive connector thingys on it (i.e.
>power, data, so on come in on the one connector).

Firstly thanks to all the people that took the time to respond - there
were a lot of you!

A lot of people told me flat out that I could not do it and that I
should just change the external drives. Me being the curmudgeon I am
did not want to do this as it involved fixing the dfstab and then
opening up the drive case and jiggering jumpers.

The short answer is that it _is_ possible. The jumpers at the front
of the disk are "wire-or'ed" with the ones on the drive connector.
That is, the resulting ID will be the combination of what is shorted
on both front and back connectors - I now have my disk running as id 5
by shorting the 4 bit on the front connector and putting the disk into
the top drive bay (normally drive 1). Since this is a Solaris 2
machine the id will work ok.

Jim White ( sent me a copy of the data from
the Seagate BB which seems to be _wrong_ (sorry Jim, I appreciated the
data but I thought I would warn people!) - they claim that the front
connector overrides the 80-way connector id (it does not) AND the
picture they gave for the connector seems to be incorrect, at least
the way I got it to work did not match what was in the diagram that
Jim sent me.

I cannot exactly remember which pins are for what ID but it seems that
on the disk I have that the ID pins are on the left hand side of the
front connector if you hold the disk facing you with the HDA

Thanks to: (Paul Roland)
        Margarita Suarez <> (Robert H. Moyer) (Jim White) (Dirk Boenning) (Birger A. Wathne) (David Procter) (Larry Ridenour) (Richard Siggs) (Jeremy Hunt - Optimation) (Syd Weinstein) (Steve Clemons) (Steve Lee) (Kalpesh Dharia) (Mark S. Anderson)
        "Christopher L. Barnard" <cbarnard@CS.UChicago.EDU> (Mark A. Davis-LCS)
        Lyle Miller <>

Brett Lymn, Computer Systems Administrator, AWA Defence Industries
"It's fifteen hundred miles to Ankh-Morpork" he said.  "We've got
three hundred and sixty three elephants, fifty carts of forage, the
monsoon's about to break and we're wearing ... we're wearing ... sort
of things, like glass, only dark... dark glass things on our eyes..."
        - Terry Pratchett "Moving Pictures".

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