
0 6 6 2 - S W 1    IBM
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders    3002|     |     |
Capacity form/unform  1052/      MB        Heads           5|     |     |
Seek time   / track   8.5/ 1.6 ms          Sector/track     |     |     |
Controller           SCSI3 SI/WI/FA        Precompensation
Cache/Buffer           512 KB SEGMENTED    Landing Zone
Data transfer rate    5.000 MB/S int       Bytes/Sector      512
                     20.000 MB/S ext SYNC
Recording method     PRML 8/9                       operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 65
Power: sleep              W     Humidity     %         5 90    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle          10.3 W     Shock        g        10       |     60
       seek               W     Rotation   RPM      5400
       read/write         W     Acoustic   dBA        34
       spin-up            W     ECC        Bit   ON THE FLY
                                MTBF         h     800000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC950,TUV,UL1950,VDE


**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
IBM      0662-S12/S1D/SW1/SWD SPITFIRE  VER. 2.1, 41K.011 4/13/1993

    68-Pin SCSI (Rear View)
    +-----------------------------------------------------+
    |                                                     |
    |                                                     |
    |                                                     |
    |                                                     |
    |++---------SCSI-----------------+--------+-Power---++|
    ||| +------------------------1-+ |+------+|+-------+|||
    ||| |\::::::::::::::::::::::::/| ||::::::|||XXXXXXX||||
    ||| +--------------------------+ |+------+|+-------+|||
    ||+------------------------------+--------+-4-3-2-1-+||
    ++                                                   ++

    50-Pin SCSI (Rear View)
    +-----------------------------------------------------+
    |                                                     |
    |                                                     |
    |                                                     |
    |                                                     |
    |++---------SCSI--------------------------+-Power---++|
    ||| +-----------------------------------1+|+-------+|||
    ||| |::::::::::::::::::::::::::::::::::::|||XXXXXXX||||
    ||| +------------------------------------+|+-------+|||
    ||+---------------------------------------+-4-3-2-1-+||
    ++                                                   ++

     SMD Jumper pin locations (Front view)
    +-----------------------------------------------------+
    |                                                     |
    |                                                     |
    |                                                     |
    |                                                     |
    |                                                     |
    |++------------------+----+--------------------------+|
    |||::::.:::::::::::::| ++ |                          ||
    |++------------------+-++-+--------------------------+|
    ++                                                   ++


     SMP Jumper pin locations (Front view)
    +-----------------------------------------------------+
    |                                                     |
    |                                                     |
    |                                                     |
    |                                                     |
    |                                                     |
    |++------------+----+--------------------------------+|
    |||::::.:::::::| ++ |                                ||
    |++------------+-++-+--------------------------------+|
    ++                                                   ++



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
IBM      0662-S12/S1D/SW1/SWD SPITFIRE 41K.011, VER. 2.1, 4/12/1993

 Jumper Setting
 --------------

 Option Jumper Block(s)
 ----------------------
 SPITFIRE contains a front jumper block with pins that can be used to
 access and enable certain features and select the SCSI address of the
 drive. For the SMP version of the electronics circuit board, those
 functions are split into two groups of pins.

 68-pin models also contain a rear option jumper block that replicates
 some of the functions contained in the front block.


 Front Options Jumper Block & TermPower Block for SMD Versions
 -------------------------------------------------------------
                                                        Termination
                                                        Power Enable
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
 |1*|03|05|07|xx|11|13|15|17|19|21|23|25|27|29|31|33|35| |A |A |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |02|01|
 |2*|04|06|08|10|12|14|16|18|20|22|24|26|28|30|32|34|36| |  |  |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
 *NOTE: PINS 1 AND 2 DO NOT EXIST IN 50-PIN MODELS!

 Pin| Description
 ---+---------------------------------------------------------
 01 | Bit 3 (MSB) (Do not exist in 50-pin models)--+
 02 | Ground      (Do not exist in 50-pin models)  |
 03 | Bit 2                                      --+
 04 | Ground                                       +-- Address
 05 | Bit 1                                      --+   Jumpers
 06 | Ground                                       |
 07 | Bit 0 (LSB)                                --+
 08 | Ground
 09 | Blank Polarity
 10 | Unused
 11 | Auto Start
 12 | Ground
 13 | +5V
 14 | Enable Active Termination
 15 | -Master Sync
 16 | -Slave Sync
 17 | LED Cathode
 18 | LED Anode
 19 | Not Connected
 20 | Not Connected
 21 | Write Protect
 22 | Ground
 23 | Not Connected
 24 | Not Connected
 25 | Auto Start Delay
 26 | Ground
 27 | Customizing Pin
 28 | Ground
 29 | Customizing Pin
 30 | Ground
 31 | Disable Unit Attentions
 32 | Ground
 33 | Disable SCSI Parity
 34 | Ground
 35 | Disable T.I.SYNC. Negotiaions
 36 | Ground


 Front Options Jumper Block & TermPower Block for SMP Versions
 -------------------------------------------------------------
                                       Termination
                                       Power Enable
 +--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
 |1*|03|05|07|xx|11|13|15|17|19|21|23| |A |A |
 +--+--+--+--+--+--+--+--+--+--+--+--+ |02|01|
 |2*|04|06|08|10|12|14|16|18|20|22|24| |  |  |
 +--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
 *NOTE: PINS 1 AND 2 DO NOT EXIST IN 50-PIN MODELS!

 Pin| Description
 ---+---------------------------------------------------------
 01 | Bit 3 (MSB) (Do not exist in 50-pin models)--+
 02 | Ground      (Do not exist in 50-pin models)  |
 03 | Bit 2                                      --+
 04 | Ground                                       +-- Address
 05 | Bit 1                                      --+   Jumpers
 06 | Ground                                       |
 07 | Bit 0 (LSB)                                --+
 08 | Ground
 09 | Blank Polarity
 10 | Unused
 11 | Auto Start
 12 | Ground
 13 | +5V
 14 | Enable Active Termination
 15 | -Master Sync
 16 | -Slave Sync
 17 | LED Cathode
 18 | LED Anode
 19 | Write Protect
 20 | Ground
 21 | Auto Start Delay
 22 | Ground
 23 | Customizing Pin
 24 | Ground


 Bottom Options Jumper Block for SMP Versions
 --------------------------------------------

   +------------ Disable T.I.SYNC Negotiations
   |  +--------- Disable SCSI Parity
   |  |  +------ Disable Unit Attentions
   |  |  |  +--- Customizing
  ++-++-++-++-+
  |07|05|03|01|
  +--+--+--+--+
  |08|06|04|02|
  ++-++-++-++-+
   +--+--+--+--- GROUND


 Rear Options Jumper Block for 68-pin models
 -------------------------------------------
   +----------------- Bit 0
   |  +-------------- Ground
   |  |  +----------- Bit 2
   |  |  |  +-------- +5V
   |  |  |  |  +----- LED Cathode
   |  |  |  |  |  +-- -Master Sync
  ++-++-++-++-++-++-+
  |01|03|05|07|09|11|
  +--+--+--+--+--+--+
  |02|04|06|08|10|12|
  ++-++-++-++-++-++-+
   |  |  |  |  |  +-- -Slave Sync
   |  |  |  |  +----- LED Anode
   |  |  |  +-------- Enable Active Termination
   |  |  +----------- Bit 3
   |  +-------------- Auto Start
   +----------------- Bit 1


 50-Pin SCSI ID
 --------------
   +----------+-----------------------+
   | SCSI ID  | MSB             LSB   |
   |          | Bit 2 | Bit 1 | Bit 0 |
   +----------+-------+-------+-------+
   |    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|
   +----------+-------+-------+-------+


 68-Pin SCSI ID
 --------------
   +----------+-------------------------------+
   | SCSI ID  |       Jumper Location         |
   |          |             PINS              |
   |          | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
   +----------+-------+-------+-------+-------+
   |    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|
   +----------+-------+-------+-------+-------+

 Auto Start (& Delay) Pins
 -------------------------
 The Auto Start and Auto Start Delay pins control when and how the
 drive can spin up and come ready. When configured for Auto-Startup,
 the motor spins up after power is applied without the need of a SCSI
 Start Unit command. For no Auto-Start, a SSI Start Unit command is
 required to make the drive spin and be ready for media access
 operations. When in Auto-Start mode, the drive will delay it's start
 time by a period of time multiplied by it's own SCSI address.
   +----------+----------+----------+-----+
   |Auto Start|Auto Start|Auto-Start|Delay|
   |Delay     |          |Mode ?    |(sec)|
   +----------+----------+----------+-----+
   |OPEN      |OPEN      |NO        | NA  |
   |OPEN      |CLOSED    |YES       |  0  |
   |CLOSED    |OPEN      |YES       | 10  |
   |CLOSED    |CLOSED    |YES       |  4  |
   +----------+----------+----------+-----+


 LED Pins
 --------
 The LED pins be used to drive an external Light Emitting Diode.

 Up to 33 mA (  5%) of TTL level LED drive capability is provided.

 NOTE
 This set of pins can be used to drive an LED located in a bezel
 connected to the front of the drive or to an external LED in systems
 where the front of the drive can not be easily seen.

 NOTE
 68 pin SCSI models have two sets of pins, a set on the front and a
 set on the back, that are connected to the same LED driver circuit.
 The combined drive capability is stated above.


 Write Protect Pins
 ------------------
 If the Write Protect pin is jumpered to ground the drive will inhibit
 SCSI commands that alter the customer data area portion of the media
 from being performed.


 Disable T.I.Sync. Negotiation Pins
 ----------------------------------
 If a Disable Target Initiated Synchronous Negotiation pin is grounded
 then an Initiator is required to start a negotiation handshake if
 Synchronous SCSI transfer are desired.


 Disable SCSI Parity Pins
 ------------------------
 Grounding this pin will disable SCSI Parity checking.


 Disable Unit Attention Pins
 ---------------------------
 Grounding this pin will disable the drive from building Unit
 Attention Sense information for commands immediately following a
 Power On Reset (POR) or SCSI Bus Reset. Any pending Unit Attention
 conditions will also be cleared at POR or SCSI Reset times.


 Customizing Pins
 ----------------
 The customizing pins and their associated jumper pins are currently
 reserved for future use. They are for features specific to particular
 host systems that must be in affect immediately after power is
 applied to the drive. Please contact your IBM Customer Representative
 for functional details on other using system specific features that
 these pins could possibly be used for.


 SCSI Bus Termination Power
 --------------------------
 Termination Power is optionally provided for systems that desire to
 use it. In order to use the termination power, the user needs to
 install a jumper between pins A01 and A02 of the TermPower Block. The
 jumper should only be installed on one device, which should be the
 last device on the SCSI bus (i.e. the drive that is phydically
 closest to a terminator). 68 pin models can source up to 2.0 Amps of
 current at 5.0 Volts ( 5%) for termination power. 50 pin models can
 source up to 1.5 Amps of current at 5.0 Volts ( 5%) for termination
 power.



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
IBM      0662-S12/S1D/SW1/SWD SPITFIRE  41K.011, VER. 2.1, 4/12/1993

 Notes on Installation
 =====================

 Installation direction
 ----------------------

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

 Mounting
 --------
 The drive can be mounted with any surface facing down.

 The drive is available with both side and bottom mounting holes.

 The maximum allowable penetration of the mounting screws is 3.8 mm.

 The torque applied to the mounting screws must be 0.8 Newton-meters
   0.1 Newton-meters.

 WARNING
 Except for the isolated mounting holes, the body of the file is not
 at ground potential. Therefore any user mounting scheme must not re-
 sult in the file being shorted to ground.

 The file may be sensitive to user mounting implementation due to file
 distortion effects. IBM will provide technical support to assist
 users to overcome mounting sensitivity.


 Clearances
 ----------
 A minimum of 2 mm clearance should be given to the bottom surface
 except for a 10mm diameter area around the bottom mounting holes. For
 proper cooling it is suggested that a clearance of 6 mm be provided
 under the file and on top of the file.

 There should be 7 mm of clearance between the files that are mounted
 with their top sides facing each other.


 Power Connector
 ---------------
 The DC power connector is designed to mate with a Molex 8981-4P4
 crimp connector, or a Molex A-70156-2000 insulator displacement
 connector, or their equivalent.

   +------------+   pin 1    +12 VDC
   | 4  3  2  1 |   pin 2    +12 Volts Return
   +------------+   pin 3    + 5 Volts Return
                    pin 4    + 5 VDC


 50-Pin SCSI Bus Connector
 -------------------------
 50-pin models use a Hirose MIF62B-54PB-2.54DS(02) connector on the
 SMD versions of the electronics circuit board and a Hirose MIF62C-
 54PB-2.54DS on the SMP versions of the electronics. They are both
 compatible with the ANSI SCSI-2 "A" connector specifications. It is
 limited to 8 bit data transfers only.


 68-Pin SCSI Bus Connector
 -------------------------
 68-pin models use an AMP 92-8012-16-1 connector that is compatible
 with the ANSI SCSI-3 "P" connector specifications. It can transfer
 data in both 8 bit (narrow) and 16 bit (wide) modes.

 NOTE
 Note that the "P" connector is not mechanically compatible with the
 50-pin "A" connector as defined in the ANSI SCSI-2 standard.
 Therefore system cables used with 50 pin products cannot be plugged
 directly into the 68 pin models.

 Despite the difference in connector, the differential 68-pin models
 are electrically compatible with differential 50-pin models and other
 50-pin differential SCSI products and therefore can coexist on the
 same bus. In order to do so, the differences in connector types would
 need to be accounted for in the cable. The same can be said for
 connecting 68 and 50 pin single-ended models to the same bus. But
 differential and single-ended models do not work connected to the
 same bus.


 SCSI Bus Cable
 --------------
 Single-ended models permit cable length of up to 6 meters (19.68
 feet). It should be noted however that users who plan to use "Fast"
 data transfers with single-ended models should follow all of the
 SCSI-3 guidelines for single-ended "Fast" operations. This may
 include a cable length of less than 6 meters.

 Differential models permit cable length of up to 25 meters (82.02
 feet). Cables must meet the requirements for differential cables as
 set forth in the ANSI SCSI-2 standard under "Cable Requirements -
 Differential Cable".

 The SCSI-2 standard states that any stub from main cable must not
 exceed 0.1 meters for single-ended cables and 0.2 meters for
 differential cables. SPITFIRE has a maximum internal stub length of
 0.053 meters on all SCSI signals. To remain compliant with the
 standard, the SCSI bus cable must not add more than 0.047 meters
 additional stub length to any of the single-ended SCSI signals or
 .147 meters to any differential SCSI signals.


 SCSI Bus Terminators
 --------------------
 Single-Ended models have internal SCSI bus active terminators that
 can be enabled by installing a jumper between pins 13 and 14 of the
 Front Options Jumper Block or pins 7 and 8 of the Rear Block on 68
 pin models. The using system is responsible for making sure that all
 required signals are terminated at both ends of the cable.

 Differential models do not have internal SCSI bus terminators. Some
 terminator possibilities are listed in the following Table.

 +-------------------------+-------------------------+
 |50 Pin Model Terminators | 68 Pin Model Terminators|
 +-------------------------+-------------------------+
 |Data Mate DM550-05-0     | Data Mate DM2050-01-68D |
 |Data Mate DM1050-02-0    |                         |
 +-------------------------+-------------------------+

 Recommendations For SCSI Bus Noise Reduction
 --------------------------------------------
 The SCSI commitee has spent a large amount of resource looking into
 what needs to be done to assure SCSI devices will work as specified
 in the SCSI-2 standard. As a result of this, the committee is
 recommending the following approach:

 1. Use the regulated 110 ohm terminator

 2. Use AWG 28 polyolefin shielded cables

 3. Make sure data and parity are on the outer ring of the cable and
    that REQ and ACK are in the core of the cable.


 SCSI Bus Electrical Characteristics
 -----------------------------------
 The following DC operating characteristics pertain to the single-
 ended SCSI bus transceivers. All of these parameters meet the ANSI
 SCSI-2 requirements.

 Ta = 0 to 70 deg. C
  +------+--------------------------+---+---+-----+---------------+
  |Symbol|Input Characteristics     |Min|Max|Units|Conditions     |
  +------+--------------------------+---+---+-----+---------------+
  |Vol   |Low level output voltage  |   |0.4| V   |lout = 48.0 mA |
  +------+--------------------------+---+---+-----+---------------+
  |Voh   |High level output voltage |2.5|   | V   |lout = -400  A |
  +------+--------------------------+---+---+-----+---------------+
  |Vil   |Low level input voltage   |0.0|0.8| V   |               |
  +------+--------------------------+---+---+-----+---------------+
  |Vih   |High level input voltage  |2.0|5.5| V   |               |
  +------+--------------------------+---+---+-----+---------------+
  |Iil   |Low level input current   |   |10 |  A  |               |
  +------+--------------------------+---+---+-----+---------------+
  |Iih   |High level input current  |   |50 |  A  |               |
  +------+--------------------------+---+---+-----+---------------+
  |Vihys |Input hysterisis          |0.3|   | V   |               |
  +------+--------------------------+---+---+-----+---------------+
  |Ci    |Input capacitance         |   |25 | pF  |W/terminators  |
  |      |                          |   |   |     |disabled, Typ= |
  |      |                          |   |   |     |19pF           |
  +------+--------------------------+---+---+-----+---------------+


 Spindle Synchronization Oberview
 --------------------------------
 There are four modes of spindle synchronization. The following
 paragraphs give a short description of each spindle synchronization
 mode:

 - The Slave drive (Slave Sync mode) receives the index from the
   Master drive on the -SLAVE SYNC line and synchronizes its INDEX
   (Slave index) to it.

 - Should the drive be the Master drive, (Master Sync mode), it out-
   puts its INDEX on the -MASTER SYNC and the -SLAVE SYNC lines. The
   Master drive does not synchronize its index to any other device.
   It simply outputs its INDEX.

 - In the Master Sync Control mode, a drive will synchronize its
   spindle to the signal it receives on the -SLAVE SYNC input. It out-
   puts to -MASTER SYNC a pulse that has the same period as the drive
   INDEX, but is not synchronized to the drive INDEX generated from
   the disk.

 - In the non-sync mode, the file will receive the -Slave SYNC signal,
   but it is not used by the file.

    Spindle Synchronization Control Lines
   +------------+-----------+-------------------+
   |-MASTER SYNC|-SLAVE SYNC|function mode      |
   +------------+-----------+-------------------+
   |released    |receive    |Slave sync         |
   +------------+-----------+-------------------+
   |drive       |drive      |Master sync        |
   +------------+-----------+-------------------+
   |drive       |receive    |Master Sync Control|
   +------------+-----------+-------------------+
   |released    |receive    |non sync           |
   +------------+-----------+-------------------+

 - File Synchronization with Offset
   The file electronics receives the Master Index and creates the
   delayed Slave Index from the drive INDEX. The delay is determined
   by using the Mode select command, Rigid Disk Drive Geometry
   Parameters (page 4). A rotational offset of 0/256 of a revolution
   up to 255/256 of a revolution may be selected in increments of 1/
   256 of a revolution.

 - Synchronization Time
   The SCSI MODE Slect command is used to select the Spindle Sync.
   mode. It could take up to 1.75 seconds (1.25 sec. nominally) to
   synchronize the Slave drive to the Master drive. While the Slave
   drive is synchronizing to the Master, it will not be able to read
   and write data. Once synchronized, the drive will maintain   20
   usec synchronization tolerance.


 Spindle Synchronization Bus
 ---------------------------
 The spindle synchronization Bus consists of the two signal lines,
 -MASTER SYNC and -SLAVE SYNC.

 - Termination
   Bus termination of the -MASTER SYNC and -SLAVE SYNC signals is
   internal to the file. These two signals each have a 2000 ohm
   pullup to the +5 volt supply. A maximum of 16 files can have their
   -MASTER SYNC or -SLAVE SYNC lines daisy chained together. Violating
   this could damage the Master file driver on the -MASTER SYNC and/or
   -SLAVE SYNC line.

 - Bus Characteristics
   - maximum Bus length = 6 meters

   - 4 micro-seconds negative active pulse

   - 0.8 volts = valid low input

   - 2.0 volts = valid high input

   - 0.4 volts = low output

   - 64 milli-amps = maximum output low level sink current

   - high level output set by termination resistors

   The driver used for these two signal lines is an open collector
   buffer.


 Hot plug/unplug support
 -----------------------
 Power supply and SCSI bus hot plug and un-plug is allowed. There is
 no special sequence required for connecting 5 volts, 12 volts, or
 ground. During a hot plug-in event the file being plugged will draw a
 large amount of current at the instant of plug-in. This current spike
 is due to charging the bypass capacitors on the file. This current
 pulse may cause the power supply to go out of regulation. If this
 supply is shared by other files then a low voltage power on reset may
 be initiated on those files. Therefore the recommendation for hot
 plugging is to have one supply for each file. Never daisy chain the
 power leads if hot plugging is planned. Hot plugging should be
 minimized to prevent wear on the power connector.

 Hot plugging the SCSI bus may cause glitches on the bus. To minimize
 the chance of glitching, it is recommended to plug in the SCSI bus
 before the power is applied.

 During hot plugging, the supplies must not go over the upper voltage
 limit. This means that proper ESD protection must be used during the
 plugging event.

 During hot-unplugging if th eoperation shock limit specification can
 be exceeded then the file should be issued a SCSI Stop Unit command
 which is allowed to complete before un-plugging.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
IBM      0662-S12/S1D/SW1/SWD SPITFIRE  41K.011, VER. 2.1, 4/12/1993


 Features
 --------
 - Industry-standard interface: ANSI/SCSI-2, single-ended (optional
   68 pin from SCSI-3)
 - Thermal compensation on each data surface for improving on track
   positioning capability.
 - SCSI disconnect and reconnect capability
 - Magnetoresistive (MR) heads
 - May be ordered with or without a bezel
 - SCSI bus parity
 - Multiple initiator support
 - Closed-loop actuator servo (dedicated disk servo surface plus data
   reference)
 - Rotary voice coil motor actuator
 - Automatic actuator latch
 - Dedicated head landing zone
 - (0.4/4) 8/9 rate encoding
 - read-ahead caching
 - Tagged and Untagged command queuing
 - Command reordering
 - Back-to-back writes
 - Automatic sector reallocation
 - Error logging and analysis
 - Variable logical block length (512-744 supported)
 - Down-loadable SCSI firmware
 - Buffer memory parity
 - Self-diagnostics on power up
 - Automatic retry and data correction on read errors
 - In-line alternate sector assignment for high performance
 - Probability of not recovering data: 1 in 10(15) bits read
 - All mounting orientations supported
 - No preventative maintenance required
 - Two field Replaceable Units (FRU's:): Electronics and HDA  -
   Predictive Failure Analysis
 - Spindle synchronization
 - LED driver
 - Write cache supported (delayed write)
 - Automatic power management
 - SCSI behavior cutomizing jumpers
 - Longitudinal Redundancy Code (LRC)
 - ECC on the fly
 - Deep Data Recovery Procedures (DRP)


 Thermal Compensation
 --------------------
 The drive periodically compensates certain all heads to account for
 movements caused by thermal changes. The compensation process is
 initiated automatically by the drive.

 The compensation of one head is called a process. A process is
 started every 36 sec during the first hour after power is applied,
 and every 3 minutes thereafter. Of that process period, 210 msec is
 actually spent compensating a head.

 Multiple SCSI commands are accepted and executed without delay during
 a compensation process if the commands are received less than 50 msec
 after the completion of the previous SCSI command.

 There is one exception. If a head due to be compensated is not
 compensated within the process period (due to the rapid arrival of
 SCSI commands and/or commands that take a large amount of time to
 execute relative to a process period), then the drive delays SCSI
 non-Priority commands, except for Test Unit Ready, from executing
 until that one head is compensated.

 This scheme insures that each head is compensated at least every 3
 minutes during the first hour after spin up, and every 15 minutes
 thereafter. The intent of the scheme is to minimize the negative
 effects of compensation on drive performance.


 Seek Time
 ---------
       +----------------------------------+--------+
       |Single cylinder (read) msec.      |   0.6  |
       +----------------------------------+--------+
       |Single cylinder (write) msec.     |   2.5  |
       +----------------------------------+--------+
       |Average                msec. typ. |   8.8  |
       |Full stroke (write)    msec.      |  18    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   5.56 |
       +----------------------------------+--------+


 SCSI Data Transfer Rate
 -----------------------
 The SCSI data transfer rate is dependent on the mode, either
 synchronous or asynchronous. It also depends upon the width of the
 data path used. 8 and 16 bit transfers are supported.

 When the drive is configured for an 8 bit wide synchronous data
 transfer rate of 10 MB/sec (instantaneous), the average SCSI data
 transfer rate is realized will be at least 9.2 MB/sec. The 16 bit
 transfer rates are 20 MB/sec and 18.4/sec respectively.

 The asynchronous data transfer rate is dependent on both the
 initiator and target delays to the assertion and negation of the SCSI
 REQ and ACK signals. It is also dependent on SCSI cable delays. The
 drive is capable of supporting up to 5 MB/sec asynchronous data
 transfer rates.

 The SCSI data transfer rate specification only applies to the Data
 phase for logical block data for Read, Write, Write and Verify, etc.
 commands. The data rate for parameter/sense data Request Sense, Mode
 Select, etc... commands is not specified.


 Acoustics Levels
 ----------------
 Upper Limit Sound Power Requirements (Bels)
 +---------+----------------------------------+-------------+
 |         |Octave Band Center Frequency (Hz) | A-weighted  |
 +---------+----+----+----+----+----+----+----+-------------+
 |Mode     | 125| 250| 500| 1 k| 2 k| 4 k| 8 k|Max. Sum     |
 +---------+----+----+----+----+----+----+----+-------------+
 |Idling   | 4.5| 3.5| 3.3| 3.5| 4.3| 4.3| 4.0|   4.75      |
 +---------+----+----+----+----+----+----+----+-------------+
 |Operating| 4.5| 4.0| 3.6| 4.1| 4.3| 4.6| 4.3|   4.7       |
 +---------+----+----+----+----+----+----+----+-------------+
 NOTE
 The operating mode is simulated by seeking at a rate between 12 and
 15 seeks per second.


 Support for Other Block Lengths
 -------------------------------
 A new release of the SCSI Interface code is required to support block
 lengths less than 512 or greater than 744 bytes. A new SCSI Interface
 Processor code release will be made available as the business
 requires. Please contat your IBM Customer Representative if you have
 requirements for block lengths other than 512-744.


 SCSI Bus Termination Power Short Circuit Protection
 ---------------------------------------------------
 The ANSI SCSI-2 specification recommends for devices that optionally
 supply TERMPWR, to include current limiting protection for accidental
 short circuits. It also recommends that the maximum current available
 for TERMPWR should not exceed 5 Amps. UL has a different requirement
 that they call the 8 Amp rule. This rule states that when a power
 source leaves an enclosure (like SCSI TERMPWR in the SCSI cable), it
 must trip 8 Amps of current within 1 minute.

 SPITFIRE uses a resettable "Positive Temperature Coefficient" (PTC)
 resistor for TERMPWR short circuit protection. These devices will
 trip when they are over-heated due to excess current flowing through
 them. When the over current condition (i.e. current surge due to a
 hot plug or intermittent short, or a solid short circuit) is removed,
 the device can automatically reset, allowing TERMPWR to again be
 sourced from this device.

 SPITFIRE complies with the 8 Amp UL requirements. For systems that
 prefer to comply with the SCSI-2 5 Amp recommended TERMPWR limit,
 the 5 Volts power supplied to SPITFIRE should be limited to prevent
 TERMPWR from exceeding 5 Amps. This would prevent a current surge in
 excess of 5 Amps that may occur in the event of a short circuit,
 before the PTC device can actually trip.


