
A T L A S   I I   2 2 7 5 S    QUANTUM
                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders        |     |     |
Capacity form/unform  2276/ 2868 MB        Heads           5|     |     |
Seek time   / track   8.0/ 0.9 ms          Sector/track     |     |     |
Controller           SCSI3 SI/ULTR/FA      Precompensation
Cache/Buffer           512 KB SEGMENTED    Landing Zone
Data transfer rate    8.000 MB/S int       Bytes/Sector      512
                     20.000 MB/S ext SYNC
Recording method     2/3 RLL1,7                     operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 66
Power: sleep              W     Humidity     %        10 90    |        95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.194
       idle           6.5 W     Shock        g        15       |     75
       seek           8.5 W     Rotation   RPM      7200
       read/write         W     Acoustic   dBA        37
       spin-up            W     ECC        Bit   198BIT REED SOLOMON,ON THE...
                                MTBF         h    1000000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates     FCC


**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
QUANTUM  XP32275/34550/39100  PRODUCT MANUAL 81-112797-02 12/96

  +---------------------------------------------------------+
  |                                                         |XX
  |                                                   +-+J5 |XXI
  |                                                   +-+   |XXN
  |                                                         |XXT
  |                                                         |XXE
  |                                                         |XXR J1
  |                                                         |XXF
  |                                                         |XXA
  |                                                         |XXC
  | *Fault LED                                              |XXE
  |+-+                                                      |XX
  || |                                                      |XX
  || |                                                      |XX
  || |                                                      |
  |+-+                                                      |XX Power
  | *Busy LED                                               |XX J2
  +---------------------------------------------------------+








 50-pin SCSI Connector (8-bit)
 -----------------------------

      +------------------------------------+
      |       Back View                    |
      |                                    |
      +------------J1----------------J2----+
      |+------------ ------------++-------+|
      ||oooooooooooooooooooooooo1||O O O O||
      ||oooooooooooooooooooooooo2||       ||
      |+-------------------------++-------+|
      +-----------SCSI-------------Power---+
      +                                    +


      +------------------------------------+
      |       Front View (Bezel End)       |
      |                                    |
      |  Fault LED                         |
      +-+----------------------------------+
      +-++----------+----------------------+
      | ||ooo oooooo20                     |
      + ||oooooooooo|                      +
        |+1---------J3 Option
    Busy LED           Connector



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
QUANTUM  XP32275/34550/39100  PRODUCT MANUAL 81-112797-02  12/96

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


 TERMPWR 8-bit Drives
 --------------------
                                |
                                |
                           +--+ |
                           |xx| | TERMPWR (8-bit Drives)
                           |oo| | To configure the drive to provide
                           +--+ | active termination, install a jumper
      --------------------------+ as shown. Else, remove the jumper.
      XXXXXXXXXXXXXXXXXXXXXXXXX
        J1  SCSI Connector


 Active Termination (8-bit Drives)
 ---------------------------------
 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
 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            |                                                |
 +------------------+------------------------------------------------+


 SCSI ID 8-bit Drives
 --------------------
 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 7.

 Set the SCSI ID for the drive at Option connector J3.

    +------------------20
    |o o o   o o o o o o| Option Connector
    |o o o o o o o o o o|
    +1------------------+

   +----------+-----------------------+
   | SCSI ID  |        Pins           |
   |          |  5-6  |  3-4  |  1-2  |
   +----------+-------+-------+-------+
   |    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|
   +----------+-------+-------+-------+

 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 (and has the
   lowest priority).

 - SCSI ID Bits 0, 1, and 2 (pins 1, 3, and 5, 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, and 6 as the associated ground returns for ID bits
   0, 1, and 2, respectively. The ground returns can be used
   individually, or the ground returns of all three ID bits can be
   combined at pin 2, 4, or 6.


 Spindle Synchronization 8-bit Drives
 ------------------------------------
 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 or the
 Auto field of the Quantum (vendor) Special Function Control Page
 (25h).

 The time interval between spindle synchronization checks is set using
 the Spindle Sync Check Interval byte of the Quantum (vendor) Special
 Function Control Page (25h) of the MODE SELECT command. Intervals of
 5 to 60 minutes can be set.

 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 Option connector
 pins 10 and 19 (pins 10 and 19 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 10 or 19 on the Option connector (pins 10 and 19
 are connected together in the drive).

 CAUTION
 All Atlas II series drives can be connected for synchronized spindle
 operation. Models XP32275, XP34550 and XP39100 drives must not be
 used for synchronized spindle operation in conjunction with drives
 from different model series or unpredictable results might occur.
 For example, XP32275, XP34550 and XP39100 drives can be connected for
 spindle synchronization in the same system, but they must not include
 a synchronization connection to a 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 Option connector. Pin 19 is
 provided to permit the use of a 2-pin plug for the spindle sync
 connections. Pin 10 i sprovided as an alternate spindle
 synchronization connection to facilitate installations where a 10-pin
 header is used to connect several remote features. The ground return
 pins are 2, 4, 6 or 20.


    +------------------20
    |* * *   0 o o o o *| Option Connector
    |o o o o o o o o o 0| * = LOGIC_GND L (Pins 2, 4, 6, 20)
    +1------------------+ 0 = SPINDL_SYNC_REF L (pins 10, 19)


 Write Protection 8-bit Drives
 -----------------------------

    +------------------20
    |o o o   o o o o X o| Option Connector
    |o o o o o o o o X o|
    +1------------------+
 To write protect the drive, install a jumper across Option
 connector pins 17 and 18. To disable write protection, remove the
 jumper.


 Spin Up Power On 8-bit Drives
 -----------------------------

    +------------------20
    |o o o   o o X o o o| Option Connector
    |o o o o o o X o o o|
    +1------------------+

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

 - Option 1
   Spin up occurs immediately when power is apploed

 - 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 13 and 14 of the Option connector.

 For Option 2, spin up after a delay, install the jumper across pins
 13 and 14 of the 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 13 and 14 of the
 Option connector.


 Remote Busy and Fault Displays 8-bit drives
 -------------------------------------------
 Busy and Fault status of the drive can be monitired remotely by
 connecting remote (external) Busy and remote Fault display LEDs to
 the Option connector.


 Remote Busy LED
 ---------------
 Connect the cathode side of the remote Busy LED to pin 9, BSY_OUT L.
 Connect the anode side of the LED to pin 11, +5VDC OUT.


 Remote Fault LED
 ----------------
 Connect the cathode side of the remote Fault LED to pin 7, FLT_OUT L.
 Connect the anode side of the LED to pin 11, +5VDC OUT.

    +------------------20
    |o o o   o o o o o o| Option Connector
    |o o o o o o o o o o|
    +1------------------+
           | | +-- +5VDC OUT
           | +---- BSY_OUT L
           +------ FLT_OUT L



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
QUANTUM  XP32275/34550/39100  PRODUCT MANUAL 81-112797-02  12/96

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

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

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


 You can mount the disk drive in any position.

 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.


 Backplane Installation (SCA Drive)
 ----------------------------------
 Because of the varity of mounting possibilities, these instructions
 are general in nature. They should be used only as a guide for
 mounitng the drive in your particular system.


 Cables
 ------
 Atlas II 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                                        |
  +-----------------+-----------------------------------------------+
  | 22-109857-01    | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | 1972515-4525    | Speciality Electronics                        |
  +-----------------+-----------------------------------------------+
    Includes 0.1-in pitch, 50-pin SCSI connector and 4-pin power
    connector.


 Combination Connector - 16-bit
 -------------------------------

  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 22-109326-01    | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | 87360-0009      | 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                                        |
  +-----------------+-----------------------------------------------+
  | 22-112893-02    | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | IL-912-19PB     | JAE                                           |
  +-----------------+-----------------------------------------------+
    A 2-mm pitch, 19-pin (2x10) keyed (missing pin) connector


 Secondary Option Connector - 16-bit
 -----------------------------------

  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 22-112472-01    | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | IL-912-31PB     | JAE                                           |
  +-----------------+-----------------------------------------------+
    A 2-mm pitch, 31-pin (2x16) keyed (missing pin) connector


 Shunt Jumper - All Models
 -------------------------

  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 22-100479-01    | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | 900-76          | August KK                                     |
  +-----------------+-----------------------------------------------+
    A 2-mm pitch shunt for configuring termination characteristics


 RAID Connector - SCA Models
 ---------------------------

  +-----------------+-----------------------------------------------+
  | Part Number     | Vendor                                        |
  +-----------------+-----------------------------------------------+
  | 22-112860-80    | Quantum                                       |
  +-----------------+-----------------------------------------------+
  | SCAT80-2-4569   | Specialty Electronics                         |
  +-----------------+-----------------------------------------------+
  Champ 0.050 inch Series I 80-position plug


 Shunt Jumper (TERMPWR Wide Drives)
 0.100 inch-pitch shunt for configuring terminator power:

                Quantum             22-109945-01
                Berg Electronics    MSB00006
                Berg Electronics    68786-102


 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



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
QUANTUM  XP32275/34550/39100  PRODUCT MANUAL 81-112797-02  12/1996

 General Description
 -------------------
 The Atlas II disk drives are 3.5-inch, high-capacity, state-of-the-
 art drives designed for high-end workstation, file servers, and
 storage systems where high capacity and etraordinary performance are
 critical.


 Caching
 -------
 The drive contains a large, segmented buffer in RAM that is used to
 maximize the throughput for sequential read streams. This cache is
 organized as a number of 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.

 The buffer is also used to combine or coalesce I/O data on a track-
 by-track basis, prior to accessing the disk media. Performance is
 greatly improved by gathering and combining the data 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.


 Embedded Servo System
 ---------------------
 Embedded servo information is written in a spoke configuration 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 II 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 with a 2:1 inter-
 leave, which can correct up to 10 bytes in each sector.

 The drive can also correct up to 2 bytes per interleave (up to 4
 per sector) in hardware ("on-the-fly"), with no loss in throughput.


 Spindle Synchronization
 -----------------------
 The drive supports both mastered and masterless synchronization and
 allows a rotational offset specified in units somewhat larger than
 a degree. Spindle Synchronization is controlled by the Rigid Disk
 Geometry and (Vendor) Special Funtion Control pages of the MODE
 SELECT command.

 NOTE
 The drives must be homogenous. Other drive model series such as
 Atlas I or Capella cannot perform spindly synchronization with Atlas
 II series drives (but they can otherwise function together).

 Spindle synchronization can be used to lock an array of drives into a
 precise rational patters. When the heads on one drive are at a
 particula address, the heads on the other drives are also known
 locations.

 Some mirrored configurations offset drives by half a revolution
 (180*) to reduce rotaional latency. Other configurations use smaller
 offsets to optimize system throughput. 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 for the next drive.
 When the first transfer is complete, the controller is ready to
 transfer the next, and so on.


 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 - specifies if the drive should spin-up at power on or
   wait for a START STOP UNIT command from the host.

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

 - 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 - allow a series of drives to be spun up at
   individually, reducing the load on the system power supply.


 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 II drives have 16 bands. The use of multiple-frequency
 recording greatly increases the capacity of the drive.


 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:

 - RAM and ROM chips

 - Buffer memory

 - Gate array chips

 - Read/write encoding circuits

 - Basic servo functions

 After a selection time following 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.


 SCSI Configured Automatically (SCAM)
 ------------------------------------
 SCAM is a process of automatic ID assignment that eliminates the
 need for user involement in the setting of unique SCSI IDs. The
 drives support and conform to the SCAM-1 automatic ID assignment
 protocol contained in the SCSI-3 draft standards for SCAM. The
 drives are also fully compatible with SCSI devices that do not comply
 with SCAM requirements.



**********************************************************************
                      G   E   N   E   R   A   L
**********************************************************************
QUANTUM   ATLAS I/II TIPS

 =====================================================================
 Application Note
 INSTALLING ATLAS II DRIVES ON A DIGITAL SYSTEM

 Digital System               DEC UNIX/DEC OSF rev 3.2 or later
 -------------------------------------------------------------------
 This application note is to be used only as a guideline for the
 titled subject. The user assumes all responsibility for understanding

 the interrelationships of this information with other affected
 software or system products. Quantum Corporation provides this
 information as a service only, and assumes no responsibility for
 any damages which could result from the use of this information.

 The information in this application note is subject to change
 without notice and is not to be construed as a commitment by
 Quantum Corporation. Quantum Corporation assumes no responsibility
 for any errors that may appear in this document.

 This application note provides instructions for installing the Atlas
 II family of disk drive products on a Digital system running DEC UNIX

 / DEC OSF rev 3.2 or later.

 Note: Before placing any Atlas II drive on any of the following:

  KZPSA (Wide Differential PCI Slot Controller) or
  KZPSA (Wide Differential PCI Slot Controller)

 Set the Always Save Data Pointers (AlwaysSDP) bit. This bit is
 located in Mode Page 25h/Byte 2/Bit 7. Normally Byte 2 is set to
 00hex. To set the Always SDP bit, this must be changed to 80hex.

 - Adaptec 1740 Controller, usually found in the DEC PC AXP 150
   (Jensen)

 Set the Delay ESP (DlyESP) bit. This bit is located in Mode Page
 25h/Byte 5/Bit 3. Normally, Byte 5 is set to 00hex. To set the
 DlyESP bit this must be changed to 08hex.

 DRIVE INSTALLATION PROCEDURE
 1. Connect drive on the bus (keeping in mind not to conflict id).
    For this example, let's assume the Atlas II drive is at id1,
    system disk is at id0, host is at id7, and the bus is BUS 0.

 2. Type "show config" at the console level before the system
    comes up. The user should see all devices on all buses. If
    the device is on a Turbo Channel slot (for example, tc1),
    then the user must type "t tc1 confg" to see the devices on
    that bus. (Please refer to your Hardware Configuration Guide
    for any questions related to console commands.)

 3. After booting the system, type the following in any shell window:

    scu sho edt | grep "Direct Access"

 The "scu" command will show all available drives and CD-ROM on the
 system with their respective bus and ID number. It is important to
 note bus type, 8-bit or Wide, and target id of the drive.


 4. Then type
    file /dev/rrz*c

 This should also give a list of device files that each drive and/or
 CD-ROM is using; e.g., bus 0 ID 0 is /dev/rrz0c, bus 0 ID 1 is /dev/
 rrzlc. Rule of thumb: Devices files are numbered from rz0 - rz7 for
 all ids numbered on an 8-bit single-ended bus 0; from 8 - 15 for ids
 on an 8-bit single-ended bus 1, and so on_, e.g., bus 1 id 0 is rz8.
 If you don't have a device file for the drive, refer to the System
 Administration guide and the man pages on MAKEDEV to determine
 options. Typically, sysadmin will have to "cd /dev" then execute
 "./MAKEDEV rz#" to create the missing device files. For wide
 drives, the steps are the same except device files are 16 per
 bus; i.e., rz0 through rz15 for a wide bus 0.

 5. Once the device file has been identified (e.g., for bus 0 ID1,
    it would be /dev/rrz1c), type one of the following drive models:

    disklabel -rw rzl xp39100 - for 9GB, or
    disklabel -rw rz1 xp34550 - for 4GB, or
    disklabel - rw rz1 xp32275 - for 2GB

 At that point, the drive is ready to be used with the system.
 Type disklabel -r rz1 (to see the partition label of the drive).
 To set up the drive in any other way other than the standard
 disklabel, refer to the System Administrator's Guide and the man
 pages on disklabel to determine options.

 =====================================================================
 Application Note

 INSTALLING ATLAS II DRIVES ON A DIGITAL SYSTEM

 Digital System                                            Windows NT
 --------------------------------------------------------------------
 This application note is to be used only as a guideline for the
 titled subject. The user assumes all responsibility for understanding
 the interrelationships of this information with other affected
 software or system products. Quantum Corporation provides this
 information as a service only, and assumes no responsibility for
 any damages which could result from the use of this information.

 The information in this application note is subject to change
 without notice and is not to be construed as a commitment by
 Quantum Corporation. Quantum Corporation assumes no
 responsibility for any errors that may appear in this document.

 This application note provides instructions for installing the
 Atlas II family of disk drive products on a Digital system running
 Windows NT.

 Note: Before placing any Atlas II drive on any of the following:

 - KZPSA (Wide Differential PCI Slot Controller)

 Set the Always Save Data Pointers (AlwaysSDP) bit. This bit is
 located in Mode Page 25h/Byte 2/Bit 7. Normally Byte 2 is set to
 00hex. To set the Always SDP bit this must be changed to 80hex.

 - Adaptec 1740 Controller, usually found in the DEC PC AXP 150

  Set the Delay ESP (DlyESP) bit. This bit is located in Mode Page
  25h/Byte 5/Bit 3. Normally, Byte 5 is set to 00hex. To set the
  DlyESP bit this must be changed to 08hex.


 DRIVE INSTALLATION PROCEDURE
 1. Connect drive on the bus (keeping in mind not to conflict id). For
    this example, let's assume the Atlas II drive is at id1, system
    disk is at id0, host is at id7, and the bus is BUS 0.

 2. Type "show config" at the console level before system comes up.
    The user should see all devices on all buses. If the device is on
    a Turbo Channel slot (for example, tc1), then the user must type
    "t tc1 confg" to see the devices on that bus. (Please refer to
    your Hardware Configuration Guide for any questions related to
    console commands.)

 3. Boot system and the drive will be recognized. It is up to the user

    at that point to make sure that the necessary steps are completed
    to make the drive useful in Windows NT, i.e., formatting,
    partitioning, etc.

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

 AHA 154x, 174x and possibly some newer models:
 There is a timing issue in that old Adaptec host adapters cannot work
 at the full speed of the Atlas (specifically, hardware read cache
 hits in the drive are handled too quickly and the host adapter isn't
 ready for data when the drive starts to send, so bytes get lost.)

 Fix: Use DSP tools (PUBLIC\TOOLS\DSP) to set the ESPDLY bit in mode
 page 25h. How: See ESPDLY.TXT.

 AHA 2940UW:
 Installing NT4.0 over an AHA-2940UW onto an Atlas with XL912 may not
 work. We are also getting reports of XL912 not working up to par on
 other systems. Vcommunications, for example, is requiring XL915 for
 their System Commander software.

 In response to this, DSE techs have been informed as to how to
 identify Atlas module types and firmware revisions, and have been
 instructed to upgrade anyone with XL912 to XL915. The required
 upgrade materials (FW, DSPTools, instructions) can be found on our
 BBS in the XL915 library, on our FTP site at ftp.qntm.com/pub/
 Support/Firmware/Atlas, and by email per request.

 We stand firm that Quantum offers no service or support for customers
 who opt to upgrade their firmware without first consulting a
 qualified technician. The technician shall judge the technical
 ability of the customer before offering DSP Tools, and may work with
 the product specialist to have the drive sent to Quantum for a FW
 upgrade.

 There are two different hardware versions for wide drives, type 22962
 and type 60059. They can be distinguished via a different secondary
 option connector (the one at the back between the two LEDs.)
 Type 22962 has a 14-pin option connector, 60059 has 12 pins. Use
 firmware A?W14*.FUP for module type 60059, A?WXL*.FUP for all others.
 =====================================================================

 Installing NT4.0 over an AHA-2940UW onto an Atlas with XL912 may not
 work.

 We are also getting reports of XL912 not working up to par on other
 systems. Vcommunications, for example, is requiring XL915 for their
 System Commander software.

 In response to this, DSE techs have been informed as to how to
 identify Atlas module types and firmware revisions, and have been
 instructed to upgrade anyone with XL912 to XL915. The required
 upgrade materials (FW, DSPTools, instructions) can be found on our
 BBS in the XL915 library, on our FTP site at ftp.qntm.com/pub
 /Support/Firmware/Atlas, and by email per request.

 We stand firm that Quantum offers no service or support for customers
 who opt to upgrade their firmware without first consulting a
 qualified technician. The technician shall judge the technical
 ability of the customer before offering DSP Tools, and may work with
 the product specialist to have the drive sent to Quantum for a FW
 upgrade.

 There are two different hardware versions for wide drives, type 22962
 and type 60059. They can be distinguished via a different secondary
 option connector (the one at the back between the two LEDs.)
 Type 22962 has a 14-pin option connector, 60059 has 12 pins. Use
 firmware A?W14*.FUP for module type 60059, A?WXL*.FUP for all others.
 =====================================================================

 Adaptec 1740 adapter: System hangs during DOS installation

 Following a successful DOS format, the DOS installation starts,
 the system hangs, and the drive's green Busy LED stays on.
 This issue has also been found on the DECpc AXP 150 system running an
 Adaptec 1740 adapter.

 A feature called ESP_Delay was added on Atlas I drives to work around
 a problem with some Adaptec adapters (1740, 1540). The Atlas I was a
 little too fast for the Adaptec adapter and we, therefore, added the
 ESP_Delay via a mode page bit.

 We found that the ESP_Delay time was incorrectly set as we increased
 the clock speed on Atlas II. This issue was found on the DECpc AXP
 150 system running an Adaptec 1740 adapter.

 Firmware version XLXQ1 only increases the delay time. We will still
 be shipping into distribution with ESP_Delay off. If a customer has a
 problem with the adapter, we will supply the tool to turn on
 ESP_Delay instead of loading new firmware.

 Adaptec SCSI PCI Ultra 2940U/UW adapter: Serious disk errors under
 DOS Xcopy

 While running DOS Xcopy (especially with the large files - 1 to 2 MB
 in size), the system reports a serious disk error has occurred while
 writing to the drive.
 This issue occurs on the Adaptec 2940 U/UW with Bios version 1.21.

 Adaptec upgraded the Bios on SCSI PCI Ultra 2940U/UW adapter to
 version 1.23
 Therefore, this issue should be resolved with Adapter 2940U/UW Bios
 versions 1.23 or higher.
 =====================================================================

 ESPDLY.TXT

 Setting the ESPDLY bit with DSP tools (for Atlas and Atlas II drives)

 Start DSP tools. If it doesn't seem to do anything, check ERROR.LOG.
 DSP tools supports a mouse if a DOS mouse driver is present.

 Read the disclaimer.

 Setup/Select/select drive ID/Ok.
 Setup/Protection/turn off/Ok.

 Mode Page/Edit/Generic Page viewer/Page 25 (no 0x or h please)
 Set Bit 3 of byte 5 in page 25. Byte 0 is where the a5 byte is:

 Setup  Update  ModePages  DIOT  LogPages

                           Vendor Unique Page # 25
 00:  1d 00 10 08 01 0f 53 10 00 00 02 00 a5 10 00 30
 10:  00 00 05 04 07 00 00 00 00 00 00 00 28 00 00 00
         ^ this is byte 5. Set bit 3 (OR in a 08h).
 20:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

 If you can't see the cursor in the hex edit window, exit
 (Esc, Alt-X) and try again in monochrome mode (MODE MONO.)

 Mode Page/Save to make the change permanent.
 =====================================================================


