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-1401A AT Interface
NOTE: This figure and the following description of each jumper position
is only valid on drives that have J6 with 4 pins (2x2).-->�
�
J5 Drive ID Select and � � J6 (located on side
Configuration Select Header� � near rear)
���������������������������� ���������������������
� o o1
40-pin I/O Cable Connector � +5v ---o o
�������������������� o o o o o1 ������
J4�::::::::::�::::::::1� /���������\ o o o o o � �
�����������������������ͳ 0 0 0 0 ��E�D�C�B�A� Remote LED�� ��Reserved
(pin 20 missing for ��5�G�G�12� (see below) Connection� �Jumper
keying purposes) DC Power �Position
J5
JUMPER | FUNCTION:
A REFSIG: This location provides a port for external connection
of the synchronized spindle reference signal (pin-1) and ground
(pin-2). The reference signal is bi-directional, single-ended, and
terminated without an external resistor. It is also available on J4
pin-28 if the factory jumper is installed. The drive will
self-determine if it is a master of slave for spindle synchronization.
B HOST SLV/ACT: When this shunt is installed, -SLAVE PRESENT
(provided by the output of a 74HCT14) is applied to J4 pin-39 for
systems that require this signal from the Master drive. If jumper "B"
is installed, then jumper "E" must not be installed.
C MASTER: When this shunt is installed, the drive is configured
as the Master. When not installed, the drive is a Slave.
D SLAVE PRESENT: When installed, this shunt indicates to the
Master drive that a Slave is present. This shunt must be installed on
the Master drive in a two-drive system.
E ACTIVE: When this shunt is installed, DASP- is made present on
J4 pin-39. If "E" is installed, then "B" must not be installed.
======================================
NOTE: This figure and the following description of each jumper position
is only valid on drives that have J6 with 6 pins (2x3).-->�
�
J5 Drive ID Select and � � J6 (located on side
Configuration Select Header� � near rear)
���������������������������� ���������������������
� o o o1
� +5v ---o o o
40-pin I/O Cable Connector � ��������
�������������������� o o o o o1 1 2 3
J4�::::::::::�::::::::1� /���������\ o o o o o Remote LED�� � ��Reserved
�����������������������ͳ 0 0 0 0 ������������ Connection� � �Jumper
(pin 20 missing for ��5�G�G�12� (see below)Ŀ � �Position
keying purposes) DC Power ���������� ATA mode ���
�
��J5����������������������������Ŀ
� �Ŀ �Ŀ �Ŀ 1 �
� �o� o-C�o�E�o�G-o �
� �o�B-o �o� �o� o �
� �A� �D� �F� �
� �������������������������� �
���Defaults shown in solid lines���
J5 Jumper Function Description
-------------------------------
A B (A=vertical, pins 9 & 10; B=horizontal, pins 8 & 10)
OFF OFF Drive is the slave (Drive 1).
OFF ON Drive is the master (Drive 0) with slave (Drive 1) present.
ON* OFF Drive s the master (Drive 0).
C (C=horizontal, pins 5 & 7)
ON Slave (Drive 1) Present is connected to J4 pin 39. Jumpers
"D" or "E" cannot be installed if jumper "C" is installed.
D (D=vertical, pins 5 & 6)
ON* DASP- is connected to J4 pin 39. Jumpers "C", "D", "F", or
"G" cannot be installed if jumper "E" is installed.
OFF REFSIG is not connected to J4 pin 39.
E (E=horizontal, pins 3 & 5)
ON REFSIG is connected to J4 pin 39. Jumpers "C", "D", "F",
or "G" cannot be installed if jumper "E" is installed.
OFF REFSIG is not connected to J4 pin 39.
F (F=vertical, pins 3 & 4)
ON* No external reference for REFSIG. Jumpers "E", "G", or "H"
cannot be installed if jumper "F" is installed.
OFF This location provides a port for external connection of
the synchronized spindle reference signal (pin 3) and
ground (pin 4).
G (G=horizontal, pins 1 & 3)
ON REFSIG is connected to J4 pin 28. Jumpers "E" or "F" cannot
be installed if jumper "G" is installed.
OFF REFSIG is not connected to J4 pin 28.
J6 Jumper Funtion Description (2x3 jumper block)
-------------------------------------------------
1 Remote LED connection. Pin 6 is connected to +5v through a
147 ohm resistor. Pin 5 is the LED driver.
2 ATA mode. When the jumper is ON, IORDY is not connected to
J4, DMACK- is connected to J4 pin 27, and DMARQ is
connected to J4 pin 29. When the jumper is OFF, IORDY is
connected to J4 pin 27, DMACK- is connected to J4 pin 29,
and DMARQ is connected to J4 pin 21.
3 Reserved jumper position.
ST - 1401A
UNFORMATTED CAPACITY (MB) ________________395.7
FORMATTED CAPACITY (xx SECTORS) (MB) _____343.7*
AVERAGE SECTORS PER TRACK ________________65 (rounded down)
ACTUATOR TYPE ____________________________VOICE COIL
TRACKS ___________________________________10,188
CYLINDERS ________________________________1,132
HEADS ____________________________________9
DISCS ____________________________________5
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec) _______20 to 25
SPINDLE SPEED (RPM) ______________________4,412
AVERAGE LATENCY (mSEC) ___________________6.8
BUFFER ___________________________________64 Kbyte
Read Look-Ahead, Non-Adaptive,
Multi-Segmented Cache
INTERFACE ________________________________AT
BYTES PER TRACK __________________________38,803 avg.
TPI (TRACKS PER INCH) ____________________1,760
BPI (BITS PER INCH) ______________________
AVERAGE ACCESS (ms) ______________________12
SINGLE TRACK SEEK (ms) ___________________2.5
MAX FULL SEEK (ms) _______________________24
MTBF (power-on hours) ____________________150,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.5
+12V TYPICAL (amps) __0.54
+5V TYPICAL (amps) ___0.53
TYPICAL (watts) ______8
MAXIMUM (watts) ______15
WRITE PRECOMP (cyl) ______________________N/A
REDUCED WRITE CURRENT (cyl) ______________N/A
LANDING ZONE (cyl)________________________AUTO PARK
IBM AT DRIVE TYPE ________________________**
Possible translation: 726 cyl, 15 heads, 61 sectors = 340,116,480
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)".
* Two spare sector per cyliner, two spare cylinders per drive.
** MAY REQUIRE FORMATTING AND PARTITIONING SOFTWARE. ALSO, 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.
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. (4/12/91)
