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Hard Drive: CDC: SWIFT 94351-186S 159MB 3.5"/HH SCSI1 SE

S W I F T   9 4 3 5 1 - 1 8 6 S    CDC
NO MORE PRODUCED                                      Native|  Translation
Form                 3.5"/HH               Cylinders    1268|     |     |
Capacity form/unform   159/  186 MB        Heads           7|     |     |
Seek time   / track  15.0/ 4.0 ms          Sector/track   36|     |     |
Controller           SCSI1 SINGLE-ENDED    Precompensation
Cache/Buffer            32 KB LOOK-AHEAD   Landing Zone
Data transfer rate    1.250 MB/S int       Bytes/Sector      512
                      5.000 MB/S ext SYNC
Recording method     RLL 2/7                        operating  | non-operating
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 70
Power: sleep              W     Humidity     %         8 90    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle               W     Shock        g         2       |     50
       seek               W     Rotation   RPM      3600
       read/write    11.5 W     Acoustic   dBA        43
       spin-up            W     ECC        Bit
                                MTBF         h     150000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     TUV,VDE


SEAGATE ST1126/1133/1162/1186/1201/1239-N PRODUCT MANUAL 36132-006

  Standard I/O
  |                                                       |XXXX Power
  |                                                 1-+   |
  |                                                 | |   |X1
  |                                    Resistor     | |   |XX
  |                                    Termination  +-+   |XX SCSI
  |                                    Packs        1-+   |XX Connec-
  |                                                 | |   |XX tor
  |                                                 | |   |XX
  |                                                 +-+   |XX
  |                                                 1-+   |XX
  |                                                 | |   |XX
  |                                                 | |   |+-1
  |                                                 +-+   || | SCSI ID
  |                                                    +-+|| |
                                           Termination Power

  Reoriented I/O
  |                                                       |XXXX Power
  |                                                 1-+   |
  |                                                 | |   |XX
  |                                    Resistor     | |   |XX
  |                                    Termination  +-+   |XX SCSI
  |                                    Packs        1-+   |XX Connec-
  |                                                 | |   |XX tor
  |                                                 | |   |XX
  |                                                 +-+   |XX
  |                                                 1-+   |XX
  |                                                 | |   |1X
  |                                                 | |   |+-1
  |                                                 +-+   || | SCSI ID
  |                                                    +-+|| |
                                           Termination Power



Jumper setting

 J2   SCSI ID jumpers
 |    SCSI ID     | 11-12 | 10-9  | 8-7   |6-5   | 4-3   | 2-1   |
 |         0      |       |       |       |OPEN  | OPEN  | OPEN  |
 |         1      |       |       |       |OPEN  | OPEN  | CLOSED|
 |         2      |       |       |       |OPEN  | CLOSED| OPEN  |
 |         3      |       |       |       |OPEN  | CLOSED| CLOSED|
 |         4      |       |       |       |CLOSED| OPEN  | OPEN  |
 |         5      |       |       |       |CLOSED| OPEN  | CLOSED|
 |         6      |       |       |       |CLOSED| CLOSED| OPEN  |
 |         7      |       |       |       |CLOSED| CLOSED| CLOSED|
 |Enable Parity   |       |       | CLOSED|      |       |       |
 |Start/Stop      |       | CLOSED|       |      |       |       |
 |Ext.Spindle     | OPEN  |       |       |      |       |       |
 |Sync. Connection|       |       |       |      |       |       |

 Pin 1-2:   Least Significant Bit
     3-4:   Next Significant Bit
     5-6:   Most Significant Bit

Start/Stop option
When a jumper is installed on pins 9 and 10, the drive waits for a
Start Unit command from the host before starting the spindle motor.
The spindle motor is also stopped using this command.

 External Spindle Motor Synchronization
 Note: this option is available on the ST1133N, ST1186N, ST1201N, and
       ST1239N only.

 Terminator Power Source Select
 ----+----+--PCB--  A-B        Drive Power Connector (Factory Default)
     |D  C|         A-C        Drive from SCSI Bus
     |B  A|         A-C & B-D  Drive from Power Connector and Provide
     +----+                    to SCSI Bus
                    B-D        Only Provide to SCSI Bus

 50-Pin SCSI Connector Pin Assignments
    Signal    Pin No.    Signal     Pin No.
    -DB(0)       2       Ground       28
    -DB(1)       4       Ground       30
    -DB(2)       6       -ATN         32
    -DB(3)       8       Ground       34
    -DB(4)      10       -BSY         36
    -DB(5)      12       -ACK         38
    -DB(6)      14       -RST         40
    -DB(7)      16       -MSG         42
    -DB(P)      18       -SEL         44
    Ground      20       -C/D         46
    Ground      22       -REQ         48
    Ground      24       -I/O         50
    Terminator  26

  Note: All odd pins, except pin-25 are connected to ground. Pin-25
        is open.

 Caution: Pin 25 must not be connected to ground at the host end or
          the drive end of the cable. If the I/O connector should
          accidentally be plugged in upside down, terminator power
          would then be shorted to ground.

The minus sign next to signals means that the asserted state is the
low voltage of the two levels used for logic signals.

 DC Power and pin connector assignments
      +------------+     1 = + 12 VDC
      | 1  2  3  4 |     2 = + 12 Volts return
      +------------+     3 = +  5 Volts return
                         4 = +  5 VDC



Notes on installation

Drive mounting

     horizontally             vertically
   |                 |   |  |     | |     |  | x+----------------+x
                         |  |     | |     |  | ||    x      x    ||
      x           x      |  |     | |     |  | ||      x  x      ||
 +------x------x-------+ |  +-----+ +-----+  | ||       xx       ||
 +-+------x--x-------+-+ +--+             +--+ ||     x    x     ||
   |       xx        |                         ||   x        x   ||
   |     x    x      |                         || x            x ||
   +---x--------x----+                         |x                x|
     x            x                           x++----------------++x
      UNACCEPTABLE!                                UNACCEPTABLE!
      Never install PC board on the Top!

The drive may be mounted horizontally with the PC board down or on
either side. Mounting vertically on either end is a prohibited orien-
For optimum performance, the drive should be formatted in the same
position as it will be mounted in the host system.

Do not mount the drive vertically on either end.

Shock and vibrations
All shock and vibration specifications assume that the drive is moun-
ted in an approved orientation with the input levels at the drive
mounting screws.

During normal operating shock and vibration, there is no physical
damage to the drive and performance is not degraded.

During abnormal operating shock and vibration, there is no physical
damage to the drive, although performance may be degraded during the
shock or vibration episode. Drive performance will return to speci-
fications when normal operating shock levels resume.

Handling and Static-Discharge Precautions
After unpacking, and prior to system integration, the drive may be
exposed to potential handling and ESD hazards. It is mandatory that
you observe standard static-discharge precautions. A grounded wrist-
strap is preferred. Handle the drive by the frame only and always
rest the drive on a padded surface until it is mounted in the host

Caution: to avoid potential service problems, observe the following

 - Handle the drive by the edges or frame. Do not put pressure on the
   top cover or touch the circuit board.
 - Do not remove or cover factory-installed labels. They contain in-
   formation needed to service the product.
 - Do not put labels over the brather holes on the top surface of the
   drive. The breather holes must remain clear to allow air to circu-
 - If a label, other than a factory-installed label, has been placed
   over the breather holes, remove it. Do not poke holes through the
   label. This damages the filter underneath, allowing contaminants
   to enter the drive.
 - Do not use solvents to remove the adhesive residue from drive
   labels. Small amounts of solvent may get into the unit and conta-
   minate the disc.
 - Do not plug a live DC power cabel into the drive power connector.
   This damages the connector contacts.

FCC Verification
This equipment has been tested with a Class B computing device and
has been found to comply with Part 15 of the FCC rules. These limits
are designed to provide reasonable protection against harmful inter-
ference in residential installations. This equipment generates, uses,
in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that will not
occur in a particular installation.

Caution: Any changes or modifications to the equipment by the user
not expressly approved by the garantee or manufacturer could void the
user's authority to operate such equipment.

Note: This digital apparatus does not exceed the Class B limits for
radio noise emissions from digital apparatus as set out in the radio
interference regulations of the Canadian Department of

SCSI Interface
The interface is compatible with the mandatory subset of the ANSI
SCSI-2 Interface Specification and the Common Command Set (CCS)

In addition, the interface includes automatic features that relieve
the host from the necessity of knowing the physical architecture of
the target.

The physical interface consists of single-ended drivers and receivers
using asynchronous or synchronous communication protocols that
support cable lengths of up to 6 meters and a bus interface transfer
rate of up to 1.25 Mbytes/sec asynchronous and 5.0 Mbytes/sec
synchronous. The drive is always a target on the SCSI bus.

The sway of the HDA left to right and front to rear is within the
envelope. The sway of the HDA up and down is .18 inches outside the

SCSI Connector
The drive may be daisy-chained to other SCSI devices using a common
cable. The SCSI devices at both ends of the daisy-cain are to be
terminated. Intermediate SCSI devices shall not be terminated. All
signals are common between all SCSI devices. The drive may be daisy-
chained only with SCSI devices that have single-ended driver and
receivers. A maximum of eight SCSI devices (including the Host) can
be daisy-chained together.

Single-Ended Drivers/Receivers
The drive uses single-ended drivers and receivers. Terminator
circuits should be installed only on the last drive in the daisy-

Cable requirements
Only nonshielded cable connectors are applicate. A 50 conductor flat
cable or 25 twisted pair cable shall be used. The maximum cable
length is 6.0 meters. A stub length of no more than 0.1 meter is
allowd off the mainline interconnection at any connected equipment.

A characteristic impedance of 100 10% is recommended for un-
shielded flat or twisted-pair ribbon cable. However, most of the
commonly-avialable cables have a somewhat lower characteristic
impedance. To minimize discountinuites and signal reflections, cables
of different impedances should not be used in the same bus. If the
same SCSI bus uses both shielded and unshielded cables, problems may
result from impedance mismatch.

In implementing your system, you may encounter trade-offs in
shielding effectiveness, cable length, the number of loads, transfer
rates, and cost to achieve satisfactory system operation.

A minimum conductor size of 28 AWG should be used to minimize noise

 External Spindle Motor Synchronization
       ST1239N only.

The external spindle motor synchronization option allows for synchro-
nized rotation of multiple disc drives in a system. Drives configured
to source a spindle clock signal are not interchangeable with drives
configured to one of the following modes:

Use internal spindle clock, omit spindle reference clock.

   - Use external spindle clock with a line terminator.
   - Use external spindle clock without the line terminator.

The spindle rotation synchronization uses one of the following

 - Reference clock is generated by the controller. All the disc drives
   are connected radially to the controller. Each end must be

Reference clock is generated by a master disc drive. All disc drives
are connected in parallel (daisy-chain) to the master disc drive. The
master disc drive end and the last drive in the chain must be
terminated. The cable consists of two #28 AWG wires. The maximum
cable length is 20 ft (6.1 meters). The external spindle clock
connector header is mounted on the disc drive main PCB. Posistion 6
of the SCSI ID Address and Option Select Jumpers is used for the
external spindle clock connection.

The external spindle clock signal shares balanced differential
drivers, balanced differential receivers and terminators with the
data transfer section.

There are three internal drive I/O termination SIP resistor modules
that plug into sockets on the PC board. You can order the drive with
or without these terminators, depending on the application. All
single initiator/single target applications require that the
initiator and drive be terminated. Daisy-chain applications require
that only the units at each end of the daisy-chain be terminated. All
other peripherals on the chain should not be terminated.

All interface signals with the drive are single-ended and must be
terminated with 220 to 5V and 330 to ground at each end ot the
total cable. All signals use open collector of three state drivers.

Note: Remove terminator resistor packs where terminators are not
required. Removal of terminator power source selection jumper does
not disconnect the terminator resistors from the circuit.

Terminator Power
The drive can be configured to supply terminator power for the SCSI
Bus. The drive also may be configured to accept terminator power via
Pin 26 of the SCSI bus or to provide terminator power for optional
internal termination resistors via the drive power connector. If
terminators are installed, jumpers must also be installed.

DC Power Specification
Except during the write procedure, power may be applied or removed in
any sequence without loss of data or damage to the drive. If you turn
off the power during the write procedure, you may lose the data
beeing written.

 A   10% tolerance for 5 VDC and +10/-15% tolerance for the 12 VDC is
 permissible during the first 10 seconds of power up. A voltage
 tolerance of   5% must be maintained after this initial start period.



These products are high capacity, high performance drives incor-
porating an embedded SCSI controller.
The SCSI Interface used in the Swift drive is compatible with the
ANSI SCSI standard and the Common Command Set (CCS) document,
Revision 4.B. Swift SCSI interface drives are classified as
"intelligent peripherals." These drives provide Level 2 conformance
with the ANSI SCSI standard.

UL/CSA Listing
The Swift SCSI disc drives comply with UL 478 and UL 1950, CSA C22.2
No. 220-M1986, VDE 0806/8.81 and EN 60 950/1.88

VDE Listing
The Swift SCSI disc drives comply with VDE 0806/8.81 and
EN 60 950/1.88

Format capacity
The sector size is user-selectable (256-4,096) at format time. The
user may modify the sector size before issuing a format command and
obtain different formatted capacities. User available will depend on
the spare reallocation method selected.

The maximum execution time for a format command is 20 minutes.

Read error rates are measured with automatic retries and data
correction with ECC enabled and all flaws reallocated. MTBF is
measured at nominal power, sea level, and 40*C ambient temperature.

MTBF 150,000 power on hours
MTTR 30 Minutes

Seek Time Definition and Timing
Seek time is a true statistical average (at least 5,000 measure-
ments) of seek time less drive internal and external host overhead.
All measurements are calculated under nominal conditions of tempera-
ture, voltage and horizontal orientation.
Track-to-track access time is the average of all possible single-
track seeks in both directions. Average seek time is measured by
executing seek in both directions between random cylinders or Logi-
cal Block Addresses (LBA). Full-stroke access time is one-half the
time needed to seek from LBA zero to the maximum LBA and back to LBA

 Note: Host overhead varies between systems and cannot be specified.
       Drive internal overhead is measured by issuing a no-motion seek
       from the highest Logical Block Address. Overhead is typically
       less than 1.5
                                          |ST11**N |
        Track-to-Track         msec. typ. |   4    |
                               msec. max. |   5    |
                       Average msec. typ. |  15    |
                       Average msec. max. |  16    |
        Full-Stroke            msec. typ. |  33    |
                               msec. max. |  35    |
        Latency                msec. avg. |   8.33 |

Communication on the SCSI bus is allowed between only two SCSI
devices at a time. There can be a maximum of eigth SCSI devices
including the host computer(s) connected to the SCSI bus. Each SCSI
device has a SCSI ID bit assigned. The SCSI ID is assigned by
installing from zero to three jumper plugs onto a connector in a
binary coded configuration during system configuration.

When two SCSI devices communicate on the SCSI Bus one acts as an
initiator and the other acts as a target. The initiator (typically a
host computer) originates an operation and the target performs the
operation. The drive always operates as a target.

The Host Adapter/Initiator must be identified by one of the eight
SCSI Device Addresses. When installing drives on the SCSI Bus make
sure no drive has the same address as the Host Adapter.

Certain SCSI bus functions are assigned to the initiator and certain
SCSI bus functions are assigned to the target. The initiator will
select a particular target. The target will request the transfer of
Command, Data, Status or other information on the data bus.

Thermal Compensation
The Thermal Compensation operation compensates for thermal-related
position offset on the selected head. Thermal Compensation is per-
formed during startup and every 2 minutes thereafter. This periodic
compensation coincides with a host command service operation. The
last command execution time will increase by 100 msec. typical or
125 msec. maximum.

Read/Write Head Auto-Park
Upon power-down, the read/write heads automatically move to the
shipping zone. All portions of the head/slider assembly park inboard
of the maximum data cylinder. When power is applied, the heads re-
calibrate to Track 0.

Start/Stop Time
After DC power has been applied, the drive becomes ready within 20
seconds unless the Motor Start option is disabled. During this time,
the drive responds to the SCSi interface. Stop time is about 10
seconds if the drive was commanded to stop and DC power was not
removed. Otherwise, no dynamic braking is applied, so stop time is
considerably longer than 10 seconds.

If the Motor Start option is enabled the internal controller accepts
a Motor Start, Inquiry, or Request Sense command via the SCSI inter-
face 3 seconds after DC power has been applied. After the Motor Start
command has been received, the drive becomes ready for read/write
operations within 20 seconds. During this time, the drive responds to
the SCSI interface.

 Note: Do not move the drive until the motor has come to a complete

There is no power control switch on the drive.

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