SEAGATE TECHNOLOGY, INC.

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

ST-325A/X AT/XT Interface

�J2 12-pin version (located
� on side, near rear)
��
�
1 3 5 7 9 11
(front) � � � � � � (back)
� � � � � �
��2��4��6��8��10�12��
� 4-pin DC
�
� 3-pin DC AT/XT Interface Power
� Power connector ��1�2�3�4Ŀ
� ��1�2�3͸ ��͸ � 0 0 0 0 �
��Ŀ � 0 0 0 � �:::::::::::::::::::1� \12�G�G�5�/
J2 Jumper Configurations� ��5�12G��P�W�A��
(12 pin version) �
note: some jumpers are VERTICAL, others are HORIZONTAL
��͸
� Jumper � Pin � AT Single � AT Master � AT Slave � XT �
��͵
� Master/Slave � 1-2 � X � X � 0 � (3) �
��Ĵ
� Slave Present � 3-4 � 0 � X � 0 � (3) �
��Ĵ
� Active LED � 5-6 � X � X � 0 (2) � X �
��Ĵ
� Host Slave � 5-7 � 0 � 0 � X (2) � 0 �
� Present � � � � � �
��͹
� XT Mode � 7-8 � � X �
��͹ ��Ķ
� XT Only: 40 � 1-2 � � X �
� Mbyte Cap. � ST351 � � �
��͹ 12 pin version ��Ķ
� XT Only: 30 � 3-4 � � X �
� Mbyte Cap. � ST351 � � �
��͹ ��Ķ
� XT Only: 20 � 1-2 & � � X �
� Mbyte Cap. � 3-4 � � �
��͹
� Factory Test � 7-9 � FACTORY USE ONLY �
��Ĵ
� Bus Reset (1) � 10-12 � 0 � 0 � 0 � 0/X �
� High � � � � � �
��Ĵ
� Bus Reset (1) � 11-12 � X � X � X � X/0 �
� Low ��
�� X = Jumpered; 0 = No Jumper

=============================================================================
=============================================================================

�J2 18-pin version (located
� on side, near rear)
��
�
1 3 5 7 9 11 13 15 17
(front) � � � � � � � � �
� � � � � � � � �
��2��4��6��8��10�12�14�16�18��
� 4-pin DC
�
� AT/XT Interface Power
� connector ��1�2�3�4Ŀ
� ��͸ � 0 0 0 0 �
��Ŀ �:::::::::::::::::::1� \12�G�G�5�/
J2 Jumper Configurations� ��P�W�A��
(18 pin version) �
��͸
� Jumper � Pin � AT Single � AT Master � AT Slave � XT �
��͵
� Factory Test � 1-2 � FACTORY USE ONLY �
��Ĵ
� Master/Slave � 3-4 � X � X � 0 � (3) �
��Ĵ
� Slave Present � 5-6 � 0 � X � 0 � (3) �
��Ĵ
� Host Slave � 7-8 � 0 � 0 � X (2) � 0 �
� Present � � � � � �
��͹
� XT Mode � 9-10 � � X �
��͹ ��Ķ
� XT Only: 40 � 3-4 � � X �
� Mbyte Cap. � ST351 � � �
��͹ 18 pin version ��Ķ
� XT Only: 30 � 5-6 � � X �
� Mbyte Cap. � ST351 � � �
��͹ ��Ķ
� XT Only: 20 � 3-4 & � � X �
� Mbyte Cap. � 5-6 � � �
��͹
� HSC1 � 11-12 � X � X � X � X �
��Ĵ
� Active LED � 13-14 � X � X � 0 (2) � 0 �
��Ĵ
� Bus Reset (1) � 15-16 � 0 � 0 � 0 � 0/X �
� High � � � � � �
��Ĵ
� Bus Reset (1) � 17-18 � X � X � X � X/0 �
� Low ��
�� X = Jumpered; 0 = No Jumper

(1) Bus reset active level. System dependent. A jumper must be
installed on either Bus Reset Hi or Bus Reset Low; the
drive will not function if neither set of pins is
jumpered.

(2) HSP/Assert "/DASP" signal: pin 39 on 40-pin AT/AT
Interface connector. The Host Slave Present jumper and the
Active LED jumper are mutually exclusive.

(3) XT only. These jumpers are used to set the drive type
information to be returned by the drive via the Drive
Configuration register (I/O port 2) or the XT Interface.

ST - 325A/X

UNFORMATTED CAPACITY (MB) ________________25
FORMATTED CAPACITY (17 SECTORS) (MB) _____21.4
AVERAGE SECTORS PER TRACK ________________
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________
CYLINDERS _(Physical/Logical)_____________xx/615
HEADS ____________________________________2/4
DISCS ____________________________________1
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________RLL 2,7 (ZBR)
INTERNAL TRANSFER RATE (mbits/sec) _______12/14
SPINDLE SPEED (RPM) ______________________3,048
INTERFACE ________________________________AT/XT
TPI (TRACKS PER INCH) ____________________1290
BPI (BITS PER INCH) ______________________28155/28922
AVERAGE ACCESS (ms) ______________________28
SINGLE TRACK SEEK (ms) ___________________7
MTBF (power-on hours) ____________________150,000
POWER REQUIREMENTS: +12V START-UP (amps) _0.8
+12V TYPICAL (amps) __0.10
+5V TYPICAL (amps) ___0.11
TYPICAL (watts) ______2.0
MAXIMUM (watts) ______
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 ________________________6

Possible translation: 615 cyl, 4 heads, 17 sectors = 21,411,840

Note: A "custom" or "user-definded" CMOS drivetype may ask for a
numerical value for the Write Precompensation cylinder and for the
Landing Zone cylinder. A basic rule-of-thumb for drive models that do
not require the old Write Precomp technique or a Landing Zone because
they are Auto-Parking is to add 1 to the cylinder value being used. As
an example: If cylinders equaled 820, then both Write Precomp and
Landing Zone would be entered as 821. Some BIOS will convert this to
65535 or -1, which are functionally equivalent to "none (not used)".

* CHECK TO SEE IF YOUR CMOS SETUP HAS A "CUSTOM" OR "USER DEFINABLE"
DRIVE TYPE AVAILABLE. (see below)

PHYSICAL/LOGICAL equivalent to NATIVE/TRANSLATION
ZBR = Zone Bit Recording = Variable sectors per track

Already low-level formatted at the factory for AT installations.

Since a User-definable or Custom translation geometry may be used, it
is imperative that the values be written down and kept with your
permanent records for retrieval in the event of CMOS battery failure.

Seagate reserves the right to change, without notice, product
offerings or specifications. (5/6/91)