Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!brutus.cs.uiuc.edu!ux1.cso.uiuc.edu!mjoseph
From: mjoseph@ux1.cso.uiuc.edu (Mark Joseph)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: ST251 Jumpers
Keywords: Seagate, Hard Disk, Jumpers, Drive Select
Message-ID: <1990Aug16.223713.239@ux1.cso.uiuc.edu>
Date: 16 Aug 90 22:37:13 GMT
References: <90228.154810JAM167@psuvm.psu.edu>
Organization: University of Illinois at Urbana
Lines: 33

In article <90228.154810JAM167@psuvm.psu.edu> JAM167@psuvm.psu.edu writes:
>Can anyone tell me what the jumpers on the the back of a Segate ST251 are
>supposed to be for?  I have a second-hand drive - with no manuals.
>Thanks.
>
>-- Jim Meyers: Penn State Great Valley

Looking at the drive with the circuit board side up: 


-------------------------  : : : : : : : :  -------------
         J1                                       J2
                           | | | | | | | |
                            don't  D D D D
                            know   S S S S
                                   4 3 2 1

If this is the only drive in the system, and you have a twisted cable,
jumper DS2 (Drive Select 2).

If this is the only drive, and you have an untwisted cable, jumper DS1.

If this is the second drive, jumper DS2.


Some of this may depend on the particular controller, but it's a start.
I do have the Seagate 'Universal Installation Handbook' (not much to it,
really, but it does have some useful info), and I'd be glad to send 
copies out - email me if you're interested.

mark joseph
m-joseph@uiuc.edu
(217) 244-2569