Seagate ST1480A HARD DISK DRIVE REPAIR, Seagate ST1480A HARD DISK DRIVE SPECIFICATIONS,
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Seagate ST1480A Hard Disk Drive Repair, Seagate ST1480A Hard Disk Drive Specifications, Seagate ST1480A Seagate ST1480A
Specifications



seagate st1480a picture.
seagate st1480a picture.
seagate st1480a picture.

Seagate ST1480A Specifications
Model Capacity Size Height Bus Type Int.Type
ST1480A 426MB 3.5" HHT IDE AT

ST1480   :    ST1480A
ST1480

Capacity: 
Speed: 
Average Read Time: 
 Cylinders: 
Heads: 
Sectors: 

426.1 MB
4400 rpm
14 ms
895
15
62



ST-1480A 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�� 3Reserved
  (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�� � 4Reserved
  �����������������������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 - 1480A

       UNFORMATTED CAPACITY (MB) ________________490.9
       FORMATTED CAPACITY (xx SECTORS) (MB) _____426.1*
       AVERAGE SECTORS PER TRACK ________________62 (rounded down)
       ACTUATOR TYPE ____________________________VOICE COIL
       TRACKS ___________________________________13,302
       CYLINDERS ________________________________1,475 (user)
       HEADS ____________________________________9
       DISCS ____________________________________5
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec) _______17 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 __________________________36,819 avg.
       TPI (TRACKS PER INCH) ____________________1,760
       BPI (BITS PER INCH) ______________________
       AVERAGE ACCESS (ms) ______________________14
       SINGLE TRACK SEEK (ms) ___________________2.5
       MAX FULL SEEK (ms) _______________________26
       MTBF (power-on hours) ____________________150,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.5
                           +12V TYPICAL (amps) __0.54
                           +5V TYPICAL (amps) ___0.3
                           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:   895 cyl, 15 heads, 62 sectors = 426,163,200

Note: A "custom" or "user-defined" 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 sectors per cylinder, 2 spare cylinders per unit.

** 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. (8/30/91)

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