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Hard Drive: AVASTOR: VP-3107W 1075MB 3.5"/SL SCSI2 WIDE




V P - 3 1 0 7 W    AVASTOR
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders    3832|     |     |
Capacity form/unform  1075/ 1225 MB        Heads           5|     |     |
Seek time   / track   9.0/     ms          Sector/track     |     |     |
Controller           SCSI2 SI/WI/FAST      Precompensation
Cache/Buffer          1024 KB SEGMENTED    Landing Zone
Data transfer rate    4.400 MB/S int       Bytes/Sector      512
                     20.000 MB/S ext SYNC
Recording method     RLL                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 66
Power: sleep              W     Humidity     %        10 80    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle           7.0 W     Shock        g        10       |     60
       seek          10.0 W     Rotation   RPM      7200
       read/write         W     Acoustic   dBA        32
       spin-up            W     ECC        Bit   198BIT REED SOLOMON,ON THE...
                                MTBF         h     800000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates     CSA,UL1950,VDE

Layout

QUANTUM XP31070/32150/34300 16-BIT PRODUCT MANUAL 81-108333-01 1995

  +--------------------------------------------------------+
  |                                                        |XX
  |                                                        |XXI
  |                                         +-+            |XXN
  |                                         |:|TERMPWR     |XXT
  |                                         +-+            |XXE
  |                                                        |XXR J1
  |                                                        |XXF
  |                                                        |XXA
  |                                                        |XXC
  |                                                        |XXE
  |                                                        |XX
  |                                                        |XX
  |                                                        |XX
  +--------------------------------------------------------+

68-pin SCSI Connector (16-bit)
------------------------------

      +--------------------------------------------------+
      |       Back View                                  |
      |                                                  |
      +------------J1------------------------------J2----+
      |+-------------------------+ +---Option--++-------+|
      |34ooooooooooooooooooooooo1| |o o o o o 1||O O O O||
      |68ooooooooooooooooooooooo35 12 o o o o o||       ||
      |+-------------------------+ +-----------++-------+|
      +-----------SCSI---------------------------Power---+
      +                                                  +

      +--------------------------------------------------+
      |       Front View (Bezel End)                     |
      |                                                  |
      |  Fault LED                                       |
      +--+-----------------------------------------------+
      +--+---+-------+-----------------------------------+
      |  |   |o ooooo|Secondary Option                   |
      +  |   |ooooooo|Connector                          +
         |   +1--J3--+
         Busy LED

Jumpers

QUANTUM XP31070/32150/34300 16-BIT PRODUCT MANUAL 81-108333-01 1995

Jumper Setting
==============

TERMPWR 16-bit Drives
--------------------

                +---+      |
                |xxx|TERMPWR
                +---+      |
                           |
                           | TERMPWR (16-bit Drives)
                           | To configure the drive to provide
                           | active termination, install a jumper
 --------------------------+ as shown. Else, remove the jumper.
  XXXXXXXXXXXXXXXXXXXXXXXXX
      J1  SCSI Connector

TERMPWR (16-bit Drives, except SCA)
-----------------------------------
To ensure that there is a sufficient level of power along the entire
SCSI bus, Quantum Corporation recommends that all devices on the
SCSI bus supply TERMPWR (if they are capable). SCSI devices are
protected by a diode or similar seminconductor to prevent back flow
of the terminator power when more than one device supplies this
power.

Active Termination (16-bit Drives, except SCA & Differential Models)
--------------------------------------------------------------------
The drive can be configured to provide or not provide active
termination. The drive location on the SCSI bus and the method used
to terminate the SCSI bus (active termination or separate terminator)
determines how to configure the active termination feature of the
drive.

NOTE
XP31070WD/XP32150WD/XP34300WD drives cannot be configured to provide
active termination. Do not install differential 16-bit drives at the
end of the bus unless the bus is properly terminated (separate
terminator resistor). Otherwise proper operation of the bus cannot be
assured. Refer to your system or SCSI controller documentation
regarding any specific recommendations regarding drive placement on
the SCSI bus and SCSI bus termination.

 +------------------+------------------------------------------------+
 |Drive installation|Active Termination Configuration                |
 |location on SCSI  |                                                |
 |Bus               |                                                |
 +------------------+------------------------------------------------+
 |Drive installed   |If there is no separate bus terminator used at  |
 |at end of bus     |the SCSI bus end that contains the drive,       |
 |                  |configured the drive to provide active          |
 |                  |termination.                                    |
 +------------------+------------------------------------------------+
 |Drive installed   |If a separate bus terminator IS used at the SCSI|
 |at end of bus     |bus end that contains the drive, configure the  |
 |                  |drive to NOT provide active termination.        |
 +------------------+------------------------------------------------+
 |Drive NOT         |Configure the drive NOT to provide active       |
 |installed at end  |termination.                                    |
 |of bus            |                                                |
 +------------------+------------------------------------------------+

 Option Connctor
   +---+--+----+ To configure the drive to provide active termination,
   |o X o o o 1| install a jumper as shown.
   |o X o o o o|
   12--+--+----+

NOTE
XP31070WD/XP32150WD/XP34300WD drives do NOT support active
termination.

SCSI ID (16-bit Drives, except SCA)
-----------------------------------
Each SCSI device on the bus must have a unique SCSI ID number
assigned to it. The drive can be configured for SCSI ID numbers that
range from 0 through 15.

Set the SCSI ID for the drive at 12-pin Option connector.

NOTE
Refer to your system or SCSI controller documentation for specific
recommendation about assigning SCSI ID numbers for you specific
system.

 +---+--+----+
 |o o o o o 1|
 |o o o o o o|
 12--+--+----+

 SCSI ID - 16-bit drives
 -----------------------
   +----------+-------------------------------+
   | SCSI ID  |       Jumper Location         |
   |          |             PINS              |
   |          |  7-8  |  5-6  |  3-4  |  1-2  |
   +----------+-------+-------+-------+-------+
   |    0     | OPEN  | OPEN  | OPEN  | OPEN  |
   |    1     | OPEN  | OPEN  | OPEN  | CLOSED|
   |    2     | OPEN  | OPEN  | CLOSED| OPEN  |
   |    3     | OPEN  | OPEN  | CLOSED| CLOSED|
   |    4     | OPEN  | CLOSED| OPEN  | OPEN  |
   |    5     | OPEN  | CLOSED| OPEN  | CLOSED|
   |    6     | OPEN  | CLOSED| CLOSED| OPEN  |
   |    7     | OPEN  | CLOSED| CLOSED| CLOSED|
   |    8     | CLOSED| OPEN  | OPEN  | OPEN  |
   |    9     | CLOSED| OPEN  | OPEN  | CLOSED|
   |   10     | CLOSED| OPEN  | CLOSED| OPEN  |
   |   11     | CLOSED| OPEN  | CLOSED| CLOSED|
   |   12     | CLOSED| CLOSED| OPEN  | OPEN  |
   |   13     | CLOSED| CLOSED| OPEN  | CLOSED|
   |   14     | CLOSED| CLOSED| CLOSED| OPEN  |
   |   15     | CLOSED| CLOSED| CLOSED| CLOSED|
   +----------+-------+-------+-------+-------+

Configure the drive for remote (external) SCSI ID selection by
removing the SCSI ID jumpers (if present) from the referenced SCSI
ID pins. Then connect the leads from the external selection
switch(es) to the referenced pins. Observe the following guidelines
while doing so.

- ID Bit 0, at Pin 1, is the Least Significant Bit.

 - SCSI ID Bits 0, 1, 2 and 3 (pins 1, 3, 5 and 7, respectively) are
   active LOW signals. That is, the bit is a 1 if the corresponding
   remote switch is closed to ground.

 - Use pins 2, 4, 6 and 8 as the associated ground returns for ID bits
   0, 1, 2, and 3, respectively. The ground returns can be used
   individually, or the ground returns of all three ID bits can be
   combined at pin 2, 4, 6 or 8.

Spindle Synchronization 16-bit Drives, except SCA
-------------------------------------------------

      +--- LOGIC_GND L
 +2-----------14
 |o   o o o o o|
 |o o o o o o o| Secondary Option Connector
 +1------------+
      +--- SPINDL_SYNC_REF L

The drive supports synchronized spindle operation. Whether the drive
operates as master or slave is determined by the contents of the RPL
field in the Rigid Disk Geometry Page (04h) for the drive.

The time interval between spindle synchronization checks is set using
the Spindle Sync Check Interval bit of the SCSI MODE SELECT command
Special Function Control page (25h).
The drive always maintains local speed regulation when no reference
signal is applied.

When the drive operates as a master, it generates a spindle
synchronization reference signal (SPINDL_SYNC_REF L). This reference
signal is available as an output to other drives at Secondary Option
connector pins 5 and 6 (pins 5 and 6 are connected together on the
drive).

When the drive operates as a slave, it looks for a spindle
synchronization reference signal (SPINDL_SYNC_REF L) as an input from
the master drive. The slave looks for this spindle synchronization
input at either pin 5 or 6 on the Secondary option connector (pins 5
and 6 are connected together in the drive).

CAUTION
Atlas series drives can be connected for synchronized spindle
operation. Models XP31070, XP32150 and XP34300 drives must not be
used for synchronized spindle operation in conjunction with drives
from different model series or unpredictable results might occur.
For example, XP31070W, XP32150W and XP34300W drives can be connected
for spindle synchronization in the same system, but they must not
include a synchronization connection to a DSP3210W or Capella series
disk drive.

NOTE
When connecting multiple drives together for spindle synchronization,
be sure to use proper cabling techniques to avoid ground loop
problems.

Attach the spindle synchronization (SPINDL_SYNC_REF L) connection
and associated ground connection at the secondary Option connector,
pin 5. Connect the associated ground to pin 6.

Write Protection 16-bit Drives, except SCA
------------------------------------------

 +2-----------14
 |o   o X o o o|
 |o o o X o o o| Secondary Option Connector
 +1------------+

To write protect the drive, install a jumper across Secondary Option
connector pins 7 and 8. To disable write protection, remove the
jumper.

Spin Up Power On 16-bit Drives, except SCA
------------------------------------------

 +2-----------14
 |X   o o o o o|
 |X o o o o o o| Secondary Option Connector
 +1------------+

Atlas drives have three Spin-Up on Power On modes:

 - Option 1
   Spin up occurs immediately when power is applied

 - Option 2
   Drive spin up occurs after a predetermined delay following power
   on. The delay is equal to a user-specified multiplier, multiplied
   by one plus the numerical SCSI ID of the drive. This will give a
   staggered spin-up in multiple-drive installations.

 - Option 3
   Drive spin up is controlled by the START STOP UNIT command.

For Option 1, immediate spin up power on, install the jumper across
pins 1 and 2 of the Secondary Option connector.

For Option 2, spin up after a delay, install the jumper across pins
1 and 2 of the Secondary Option connector. Set delay parameters in
the MODE SELECT command, Quantum (Vendor) Special Function Control
Page (25h).

For Option 3, spin up controlled by the START STOP UNIT command,
remove the jumper (if present) from across pins 1 and 2 of the
Option connector.

Remote Busy and Fault Displays 16-bit drives, except SCA
---------------------------------------------------------
Busy and Fault status of the drive can be monitired remotely by
connecting remote (external) Busy and remote Fault display LEDs to
the Secondary Option connector.

 Remote Busy LED
 ---------------
 Connect the cathode side of the remote Busy LED to pin 11, BSY_OUT L.
 Connect the anode side of the LED to pin 13, +5VDC OUT.

 Remote Fault LED
 ----------------
 Connect the cathode side of the remote Fault LED to pin 14, FLT_OUT
 L. Connect the anode side of the LED to pin 13, +5VDC OUT.

              +---- FLT_OUT L
 +2-----------14
 |o   o o o o o|
 |o o o o o o o| Secondary Option Connector
 +1------------+
            | +---- +5 VDC OUT
            +------ BUSY_OUT L

Install

QUANTUM XP31070/32150/34300 PRODUCT MANUAL 81-108333-01 4/1995

Notes on installation
=====================

Drive mounting
--------------

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  |
   |                 |   |  |     | |     |  | |+----------------+|
 +-+-----------------+-+ |  |     | |     |  | ||                ||
 +---------------------+ |  |     | |     |  | ||                ||
                         |  |     | |     |  | ||                ||
                         |  |     | |     |  | ||                ||
 +---------------------+ |  +-----+ +-----+  | ||                ||
 +-+-----------------+-+ +--+             +--+ ||                ||
   |                 |                         ||                ||
   |                 |                         ||                ||
   +-----------------+                         ||                ||
                                               ++----------------++

You can mount the disk drive in any position. R models mount in RAID
storage subsystems. The drive (with bezel) attaches to the system bay
and accept #6-32 screws. Screws should not exceed 0.25 inch
(6.25 millimeters) in length, otherwise damage to the PCB may result.

 CAUTION
 The placement of the drive in the computer system must permit
 sufficient air-flow to maintain drive environment temperature within
 41*CF to 131*F (+5*C to +55*C) and maintain component surface
 temperatures below the maximums.

Mounting brackets may be required when installing the drive in a
5.25-inch form factor bay. We recommended using brackets supplied
by Quantum Corporation to mount the drive. Otherwise, the drive's
isolation characteristics could be compromised. A bracket kit
including four screws is available from the Quantum Corp. The part
number is 70-30695-01.

The drive base contains threaded holes on its sides and bottom to
mount the drive assembly. The holes accept #6-32 UNC screws.

Installation in a 3.5-inch Bay
------------------------------
The drive base contains threaded holes on its sides and bottom to
mount the drive. The holes accept #6-32 screws.

Installation in a 5.25-inch Bay
-------------------------------
A Bracket kit including four screws is available from the Quantum
Corp. The part number is 70-30695-01. Attach the brackets to the
drive using four #6-32 screws.

CAUTION
Screw-length must not exceed 0.25-inch (6.25 millimeters); or the
drive may be damaged.

 Cables
 ------
 Atlas drives use single-ended or differential drivers and receivers.
 The user furnishes the appropriate cables and connectors to match the
 drive connectors listed in the following table.
    +----------------------------------------+
    |                                        |
    |                                        |
    | +-----J1-SCSI----------------Power---+ |
    | |+-------------------------++4-3-2-1+| |
    | ||oooooooooooooooooooooooo1||O O O O|| |
    | ||ooooooooooooooooooooooooo||       || |
    | |+-Interface-Connector-----++--J3---+| |
    +-+------------------------------------+-+

 68-Pin Wide SCSI Connector and 12-Pin Auxiliary Connector
 ---------------------------------------------------------
    +------------------------------------------------+
    |                                                |
    |                                                |
    | +-----J1-SCSI----------------12-Pin---Power--+ |
    | |+------------------------1++------++4-3-2-1+| |
    | |||||||||||||||||||||||||2|||.....1||O O O O|| |
    | |||||||||||||||||||||||||||||......||       || |
    | |68-Interface-Connector----+12-----++--J3---+| |
    +-+--------------------------------------------+-+

 80-pin Single Connector Attachment (SCA) SCSI Connector J1
 ----------------------------------------------------------
    +----------------------------------------------+
    |                                              |
    |                                              |
    | +------------------------------------------+ |
    | |      +--------------------------1-+      | |
    | |      | oooooooooooooooooooooooo2o |      | |
    | |      | oooooooooooooooooooooooooo |      | |
    | |      +80-----J1-SCSI--------------+      | |
    +-+------------------------------------------+-+

 Combination Connector - 8-bit
 ------------------------------
  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 12-41254-01     | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | 87711-502       | Berg Electronics (formerly Dupont Electronics)|
  +-----------------+-----------------------------------------------+
    Includes 0.1-in pitch, 50-pin SCSI connector and 4-pin power
    connector.

 Combination Connector - 16-bit
 -------------------------------
  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 12-43123-01     | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | 87360-0003      | Molex                                         |
  +-----------------+-----------------------------------------------+
    Includes 68-pin SCSI connector, 4-pin power connector, and a
    2-mm pitch, 12-pin (2x6) Option connector.

 Option Connector - 8-bit
 ------------------------
  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 12-36484-08     | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | 954339-01-10-15 | 3M                                            |
  +-----------------+-----------------------------------------------+
  | P92-300-204-6   | AMP, Inc.                                     |
  +-----------------+-----------------------------------------------+
  | 87049-2085      | Molex, Inc.                                   |
  +-----------------+-----------------------------------------------+
    A 2-mm pitch, 19-pin (2x10) keyed (missing pin) connector

 Secondary Option Connector - 16-bit
 -----------------------------------
  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 12-36484-09     | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | P93-300-204-7   | AMP                                           |
  +-----------------+-----------------------------------------------+
  | 954339-01-07-15 | 3M                                            |
  +-----------------+-----------------------------------------------+
    A 2-mm pitch, 13-pin (2x7) keyed (missing pin) connector

 Shunt Jumper - All Models
 -------------------------
  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 12-36482-01     | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | 86730-001       | Berg Electronics (formerly Dupont Electronics)|
  +-----------------+-----------------------------------------------+
  | LPC-SPG         | Honda                                         |
  +-----------------+-----------------------------------------------+
    A 2-mm pitch shunt for configuring termination characteristics

 RAID Connector - SCA Models
 ---------------------------
  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 12-41319-01     | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | SSC80-D01       | Specialty Electronics                         |
  +-----------------+-----------------------------------------------+
  Chamo 0.050 inch Series I 80-position plug

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

Features

QUANTUM XP31070/32150/34300 PRODUCT MANUAL 81-108333-01 4/1995

General Description
-------------------
The Atlas disk drives are 3.5-inch, high-capacity, state-of-the-art
drives designed for applications where high-capacity, performance,
and space demands are critical, such as Macintosh (TM), and Windows
(TM)-driven desktop and multi-tasking systems, local area networks,
and file servers.

Caching
-------
The disk cache is a look-ahead buffer used for combining or
coalescing I/O commands on a track-by track basis prior to accessing
the disk media. Throughput performance is greatly improved by
gathering and combining commands on a track basis rather than on a
command basis. With this unique system, multiple commands for a
particular track are coalesced in the buffer before accessing the
media.

As a result, multiple I/O commands, that address a single track are
logically combined, avoiding multiple disk accesses on multiple
rotations. Since most reads and writes are sequential, buffering data
before it is stored on the media yields greatly increased throughput
for most applications.

The drive electronics contains a 1MB segmented buffer that maximizes
the cache hit rate for sequential read streams. The cache is
organized in RAM as separate track line segments. Each track line
segment can hold data from one complete track on the media,
temporarily assuming the identity of the track for all input/output
functions.

Embedded Servo System
---------------------
Embedded servo information is written in a spoke configuration, 54
times on every track, on every disk surface. The spokes (or headers)
consist of quadrature analog pattern and digital address data. The
digital portion of the spoke data are read and used to locate the
desired track, spoke, and head number. The quadrature analog signal
portion is detected and used by a servo feedback control loop to
precisely position the head on the track center.

Data integrity and security
---------------------------
Atlas disk drives use a combination of parity checking, error
detection coding (EDC), error correction coding (ECC), and check-
pointing to protect stored data from media errors, transfer or
addressing errors, or errors introduced during sector reallocation.

Media Error Protection
----------------------
To ensure that data is the same as data written, the drive computes
and appends an Error Correction Code (ECC) to each sector of data
stored. The drive uses a 198-bit Reed Solomon code. This allows
correction of up to 10 bytes in each sector.

The ECC can correct a single burst error up to 73 bits in length or
a double burst error up to 25 bits in length for each burst.

The drive has the capability of correcting in hardware ("on-the-fly")
a single burst error up to 25 bits long with no increase in latency
time.

Spindle Synchronization
-----------------------
Spindle Synchronization is the process of causing the disk assemblies
in several disk drives to rotate to the same address location at the
same time. Synchronization is used in RAID (redundant arrays of
independent devices) mass storage systems, allowing a set of disk
drives to function as one drive.

To accomplish this, sector 0, track 0 of each drive must be under the
read/write heads at exactly the same time. With spindle
synchronization, all the drives are locked to the same relative
position.

If all the drives are synchronized exactly, the time used to access
one drive results in the next drive passing the correct position.
This problem is resolved by using an offset that is the sum of the
transmission delays of the interconnecting bus cable, data transfer
times, and the rotational latency of the drives.

Knowing how long it takes to set up an I/O operation and transfer
data to a drive, the SCSI controller can send the data to one drive
and, while that data is being transferred, set up the I/O transfer
to the next one. When the current transfer is complete, the
controller is ready to transfer the next, and so on.

Spindle Synchronization is controlled by the Rigid Disk Geometry and
(Vendor) Special Function Control pages of the MODE SELECT command.

NOTE
The drives must be homogenous. Other drive model series such as
Capella cannot function with Atlas-series drives.

Special Functions
-----------------
Quantum has incorporated a number of unique options into the drive.
The (Vendor) Special Function Control page is used to control these
options. The options include:

 - Spin Delay - delays the spin-up of the drive to reduce startup
   load of system power.

 - Initiate Synchronous Data Transfer Negotiation - a toggle-type
   parameter that allows the initiator to move between asynchronous
   and synchrounous modes of data transfer.

 - Slow Cable - adds an additional delay to REQ/ACK for very long bus
   cables.

 - No Multiple Active I/O Process - a toggle-type command to enable/
   disable multiple I/O process.

 - Force Disconnect - the drive can be forced to disconnect from the
   SCSI bus after a SCSI Command is received in order to reduce on-bus
   time. Force Disconnect works only when a typical, error-free
   command is received.

- Write Protect - Prevents writing to the disk drive.

 - Spindle Sync Check Interval - specifies the time, in minutes, of
   the interval between spindle synchronization status checks.

 - Stagger Spin Delay - specifies the time in 100 ms increments of the
   delay the drive uses in the spin-up delay formula, allowing a
   series of drives to be spin up at staggered time intervals.

Banded recording
----------------
In banded recording, the disk is divided into multiple bands or
partitions (also called notches or bit-zoned areas). Starting at
inner band, each next outer band has a hihger recording frequency.
The Atlas drives have 16 bands. The use of multiple-frequency
recording greatly increases the capacity of the drive.

Diagnostics
-----------
The drive has extensive diagnostic capabilities, including those
described below:
power-up self-test, periodic self-adjustments, and host diagnostics.
Quantum uses self-diagnostic tests and sense data tracking to manage
drive errors, in addition to logical sector address (LBA)
revectoring.

Power-Up Self-Test
------------------
The disk drive performs a self-diagnostic test immediately at power
up. If the drive fails its self-diagnostic tests, it will report
sense information but will not spin up. Both the Fault LED and a
Busy LED briefly illuminate during spin-up as a lamp test.

If the drive passes its self-tests and the spin-up jumper is
installed, it spins up and perform further diagnostics on the HDA.
The drive indicates "not ready" until the HDA tests are completed
successfully.

The drive diagnostics test the following:

- Drive master microprocessor

- RAM and ROM chips

- Buffer memory

- Gate array chips

- Read/write encoding circuits

- Basic servo functions

- SCSI interface control circuits

Following a selection time after power-on, the disk drive is able to
respond with appropriate status and sense data to the TEST UNIT
READY, INQUIRY, and REQUEST SENSE commands.













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