SUMMARY: Jumpers for an ST4350NM / 94171-350M disk?

From: David Holmes (
Date: Sun Oct 31 1993 - 14:32:59 CST

Original question was a request for jumper info for the ST4350NM / 94171-350M
disk. I received a lot of excellent information in the reponses.

Many thanks folks! As ever sun-managers came through with flying colours -
would that some vendors could do this well...

(credits at the bottom)

I received a number of replies that included disktab info but these were for
other drives: the 344 or the 307. The number of cylinders (and one assumes,
other things such as number of heads, sec/trk etc) are not the same. The 350
has 1412 while the 344 has 1545 and the 307 has 1407 or some such. I was
initially unsure about this myself and wondered if this was just sun renaming
these things... (check out the reply at the bottom)

thanks again...

Some Seagate information phone numbers:
detailed info re: any Seagate disk drive: free FAX line: (408) 438-2620
BBS run by Seagate in the US: 408 438 8771
                                     (9600 baud,8 bit,no parity,1 stop bit)
Seagate's automated 24-hour help hot-line: (408) 438-8222

What follows are a number of replies with the complete technical info on the

Pins 3-5 are the drive select pins, configured as follows:

No jumper SCSI ID 0
pin 5 SCSI ID 1
pin 4 SCSI ID 2
pins 4 and 5 SCSI ID 3
pin 3 SCSI ID 4
pins 3 and 5 SCSI ID 5
pins 3 and 4 SCSI ID 6
pins 3,4,and 5 SCSI ID 7

Looking at that, I probably didn't need to tell you that! ;>
Pin 1, if jumped, enables parity check.

Pin 2, if jumped, means that the drive motor will not start until it

receives a Start Unit Command. If not jumped, the drive motor will start


Pins 6 and 7 are the ground select jumpers. My manual says to "see figure
2-6", but there is no figure 2-6. ;> We've always ignored these--left them
in whatever configuration they were in, with no problem.

Pins 8 and 9 refer to the terminator power source select. quoting from

the manual:

 If the unit is not to be terminated, remove terminator resistor DIPs.

 If installed, the TP jumper (for pins 8 and 9) must be installed only in

 one of the two positions shown in the figure below.

 Jumper in vertical position (default position) means terminator power

 (+5 V) is from WREN IV power connector. Jumper in horizontal position

 means terminator power is taken from the interface (SCSI) cable.

The diagram shows that for the vertical position, the jumper should be on

the leftmost pins, and for the horizontal position, the jumper should

connect the bottom two pins.

The terminator resistor DIPs are on either side of the drive, on the

bottom rear, and are socketed for removal. Since we externally terminate

our drives, these are by default always removed.

  | |
  | |
  | |
  | |
  | J3 |
  _____________________jumpers_J4-> __:::::_::__|o o o o|____ <-power plug
  -xxxxxx-[::::::::::<scsi conn>::::::::::]---::--xxxxxx-----

Ground Select Jumper J3
3 o o 1
4 o o 2

Drive Select and Option Select Jumper J4
o o o o o
o o o o o
P 4 2 1

Terminator Power Source Select Jumper J5
3 o o 1
4 o o 2

Pin setting Description
1-2 In AC + DC ground connected to signal ground
3-4 In AC + DC ground connected to chassis ground

Pin setting Description
P In Parity Enabled

Pin setting Desciption
3-4 In Terminator power from DC connector

J4 Address Jumper Settings
Pin setting Description Target
1,2,4 Out Drive Select Target 0
1 In Drive Select Target 1
2 In Drive Select Target 2
1,2 In Drive Select Target 3


                         SEAGATE TECHNOLOGY, INC.
       Customer Technical Support FAX Network +1 408 438-8137
     Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
3 United States +1 408 438-8771 3 United Kingdom +44 628 478011 3
3 Germany +49 89 140-9331 3 Singapore +65 227-2217 3
                            (C)opyright 1991

ST-4350N (94171-350) Wren 4 FH SCSI

Connects CHASIS ground to ground lug DDDDDDDDDDDDDD?
Connects SIGNAL ground to ground lug DDDDDDDDDDDD? 3
                   Drive Select ID's DDDDDDD? 3 3
           Motor Start Option enable DDD? 3 G G
          Parity Check Option enable D? 3 ZDED? Z1B2?
                                      P M 4 2 1 3o3o3 Z12DGDGD5D?
                                      o o o o o 3o3o3 3 0 0 0 0 3 Power
                                      o o o o o @DADY \DDDDDDDDD/

    1DDDDDDDY 3:::SCSI Cable::::::::::::1 3 ZD? 1DDDDDDDDY
Terminator power (+5v) from drive (vertical) DDDY
Terminator power from the Bus (lower horizontal)

                        94171-350/M WREN 4 FH

       UNFORMATTED CAPACITY (MB) ________________350
       FORMATTED CAPACITY (xx SECTORS) (MB) _____300
       AVERAGE SECTORS PER TRACK ________________46
       ACTUATOR TYPE ____________________________VOICE COIL
       TRACKS ___________________________________12708
       CYLINDERS ________________________________1412
       HEADS ____________________________________9
       DISCS ____________________________________5
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (2,7)
       TRANSFER RATE (mbytes/sec) _______________1.25-1.875
       SPINDLE SPEED (RPM) ______________________3,600
       AVERAGE LATENCY (mSEC) ___________________8.33
       BUFFER ___________________________________32 Kbyte
         Read Look-Ahead, Non-Adaptive,
         Single-Segmented Buffer
       INTERFACE ________________________________SCSI
       TPI (TRACKS PER INCH) ____________________1280
       BPI (BITS PER INCH) ______________________19058
       AVERAGE ACCESS (ms) ______________________16.5
       SINGLE TRACK SEEK (ms) ___________________4
       MAX FULL SEEK (ms) _______________________43
       MTBF (power-on hours) ____________________100,000
       POWER REQUIREMENTS: +12V START-UP (amps) _4.5
                           +12V TYPICAL (amps) __1.5
                           +5V START-UP (amps) __2.0
                           +5V TYPICAL (amps) ___1.8
                           TYPICAL (watts) ______27
                           MAXIMUM (watts) ______64
       BUFFERED STEP PULSE RATE (micro sec) _____
       WRITE PRECOMP (cyl) ______________________N/A
       REDUCED WRITE CURRENT (cyl) ______________N/A
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

ZBR = Zone Bit Recording = Variable sectors per track
Already low-level formatted at the factory.

Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90)

thanks specifically to the following for their excellent replies:

From: Dave Hightower <>
From: Heas <>
From: (Larry Freeman)
From: (Barry Levin)
From: (Andrew Scarman)
From: (Zdenek Dospisil (AARM1A))
From: Jeremy Barth <>
From: Ian Daniel <>

________ __________________________ __
        David Holmes McGILL UNIVERSITY
  RISQ NOC - UNIX / Networking Montreal, CANADA
(NeXT)email delphys@CC.McGill.CA +1 514 398-3716 fax: 398-6876

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