
G O D R I V E   G L S   1 2 7   A T    QUANTUM
                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 2.5"/SUPERSLIMLINE    Cylinders    1395|  677|     |
Capacity form/unform   127/      MB        Heads           3|    9|     |
Seek time   / track  17.0/ 5.0 ms          Sector/track     |   41|     |
Controller           IDE / AT              Precompensation
Cache/Buffer            96 KB              Landing Zone
Data transfer rate    2.938 MB/S int       Bytes/Sector      512
                      4.000 MB/S ext
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5 V          Temperature *C         5 55    |    -40 65
Power: sleep          0.2 W     Humidity     %        10 90    |     10 90
       standby        1.0 W     Altitude    km    -0.061  3.048| -0.061 12.192
       idle           1.6 W     Shock        g        10       |    100
       seek           2.2 W     Rotation   RPM      3600
       read/write     2.2 W     Acoustic   dBA        33
       spin-up            W     ECC        Bit   112,REED SOLOMON
                                MTBF         h     350000
                                Warranty Month        12
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC950,TUV,UL1950,VDE


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QUANTUM  GODRIVE GLS 85/127/170/256 AT  PRODUCT MANUAL 81-103562-04

  +---------------------------------------------------------+
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |*X
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |      SP                  CS DS                          |  1
  |    +-+-+                +-+-+-+                         |XX
  +----+++++----------------+++++++-------------------------+



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                      J   U   M   P   E   R   S
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QUANTUM  GODRIVE GLS 85/127/170/256 AT  PRODUCT MANUAL 81-103562-04

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

 The jumper pins are located on the underside of the printed circuit
 board (PCB).

 GoDrive GLS 85/127/170/256 AT hard disk drives can be configured as a
 master or a slave drive, using either the jumper blocks on the
 drive's controller board or by  grounding certain lines on the inter-
 face connector.
                                                            |XX
                                                            |XX
         SP                  CS DS                          |  1
  |    +-+-+ +              +-+-+-+ +                       |XX
  +----+++++-+--------------+++++++-+-----------------------+
             |                      |
     +-------+---+         +--------+-------+
     | +-++-+    |         |+-++-++-+       |
     | ++++++Pins|         |+++++++++ Pins  |
     |   SP      |         |  CS DS         |
     | +*--*+    |         |+*--*+          |
     | +----+    |         |+----+Jumper    |
     | Jumper    |         | OR +*--*+      |
     +-----------+         |    +----+Jumper|
                           +----------------+


 There are two sets of jumper pins. The SP is labeld "SP" for slave
 present. The other set (three jumper pins) has two labels "CS" and
 "DS" for Cable Select and Drive Select. The center pin is common to
 both the CS and the DS positions.

 When a jumper block is on the center pin and the pin nearest the
 interface connector, DS is enabled. When a jumper block is on the
 center pin and the pin furthest from the interface connector, CS is
 enabled.


 NOTE
 Jumper blocks can be placed in a storage position by locating them on
 one jumper pin as shown in the following Figure.

       +-++-+               +-++-++-+
       ++++++Pins           +++++++++ Pins
         SP                   CS DS
          +*--*+                  +*--*+
          +----+Jumper            +----+Jumper


 Master Drive Configuration
 --------------------------
 GoDrive GLS 85/127/170/256 AT hard disk drives are configured at the
 factory as a master drive as defined by the CAM (Common Access
 Method). This configuration is shown in the following figure.

       +-++-+               +-++-++-+
       ++++++Pins           +++++++++ Pins
         SP                   CS DS
          +*--*+               +*--*+
          +----+Jumper         +----+Jumper


 Master Drive with Slave Present
 -------------------------------
 When GoDrive GLS 85/127/170/256 AT hard disk drives are configured as
 a master drive, the drive looks for a slave drive by monitoring the
 PDIAG/DASP lines.

 Some hard disk drives when configured as a slave do not indicate
 their presense on these two lines (GoDrive does). To indicate that a
 slave is present for these drive (when using GoDrive as a master),
 the slave present (SP) pins on GoDrive master must be jumpered as
 shown.
          +-++-+               +-++-++-+
          ++++++Pins           +++++++++ Pins
            SP                   CS DS
          +*--*+                  +*--*+
          +----+Jumper            +----+Jumper


 Slave Drive Configuration
 -------------------------
 GoDrive GLS drives can be configured as a slave drive as shown.

       +-++-+               +-++-++-+
       ++++++Pins           +++++++++ Pins
         SP                   CS DS
          +*--*+                  +*--*+
          +----+Jumper            +----+Jumper

 Cable Selection
 ---------------
 The drive can be configured such that its status as a master or slave
 drive can be determined by the cabling from the host system.

       +-++-+               +-++-++-+
       ++++++Pins           +++++++++ Pins
         SP                   CS DS
          +*--*+            +*--*+
          +----+Jumper      +----+Jumper

 NOTE
 This is extremely helpful when GoDrive GLS 85/127/170/256 AT is used
 as a removable subsystem where it can be either master drive or a
 slave drive depending upon the cable to which is connected.

 When a GoDrive GLS drive is configured for cable selection, as shown
 in the Figure below, it is master drive if Pin 28 is grounded and a
 slave if Pin 28 is not grounded.

 For systems that do not use Pin 28 for another purpose (e.g., Spindle
 Synchronization), the host system can tie Pin 28 to ground. Then the
 cable connecting the host to the master has Pin 28 enabled (i.e., a
 circuit exists), while the cable connecting the slave to either the
 host or the master has the Pin 28 line servered.

 Systems that use Pin 28 can use the cable selection method by
 performing the following:

   1. Connect the system cable in the following order
      host <--> slave <--> master.

   2. Cut the Pin 28 line between the slave and the master. This
      allow Pin 28 to operate normally (an open - served connection)
      between the host and the slave.

   3. Tie Pin 28 (within the master drive header) to a nearby ground
      (Pin 30, for example).

 This process will allow the master drive to have Pin 28 grounded
 while allowing the Pin 28 to be open between the host and slave
 drive.



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                      I   N   S   T   A   L   L
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QUANTUM  GODRIVE GLS 85/127/170/256 AT  PRODUCT MANUAL 81-103562-04

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

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

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

 The drive will operate in all axis (6 directions).


 Dimensions and Mounting
 -----------------------
 GLS drives are designed to meet the Manufacturers Compatibility
 Committee (MCC) dimensional requirements.

 The drive can be mounted in any orientation. Maximum screw penetra-
 tion is 3mm with a minimum penetration of three full threads. The
 maximum mounting torque for these screws is 40 inch-ounces.

 NOTE
 For optimum drive performance, the system mounting method should not
 result in any disortion or twisting of the drive's base casting. For
 example, if the drive is attached (via its bottom mounting holes) to
 a stiff mounting surface that does not meet the GoDrive GLS flatness
 requirements of 0.01", then head switch times may be degraded.

 The threaded holes in each of the four corners of the GoDrive GLS are
 for top cover attachment only and should never be used for any other
 purpose.


 Ventilation
 -----------
 GoDrive GLS 85/127/170/256 AT hard disk drives can operate without a
 cooling fan, provided the ambient air temperature des not exceed 55*C
 (131*F). Any user-designed cabinet must provide adequate air
 circulation to prevent the maximum temperature from being exceeded.


 Cable Connector
 ---------------
 GoDrive GLS 85/127/170/256 AT hard disk drives have a single 2 x 22
 connector (on 2mm centers) for both power and data. The connector
 also includes four pins which are reserved for factory test points -
 these pins must be allowed to float.

 The recommended system mating connector is a 3M Series 150 or
 equivalent. The maximum cable length is 18 inches. To assure that the
 system cable connector is installed with the proper orientation, plug
 Pin 20 hole on the system connector.



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                      F   E   A   T   U   R   E  S
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QUANTUM  GODRIVE GLS 85/127/170/256 AT  PRODUCT MANUAL 81-103562-04

 General Description
 -------------------
 Quantum's GoDrive GLS 85/127/170/256 hard disk drives provide the
 high capacity, performance and reliability required by today's
 advanced 386- and 486-based notebook computers. The GoDrive GLS
 products offer outstanding performance, with fast time-to-data and
 outstanding sustained data transfer rates. These drives also offer
 low power consumption (0.2 watts standby). Fast spin-up times from
 the standby mode help conserve power and improve system response
 time.

 The GoDrive GLS hard disk drives provide extensive error correction
 capability, with features such as ECC on-the-fly which minimizes the
 impact of recoverable errors on throughput. The GoDrive GLS products
 feature highly reliable one,- two- and three-disk designs supported
 by a projected field MTBF of more than 350,000 hours. A one-year
 warranty is standard on GoDrive GLS drives purchased directly from
 Quantum or a authorized distributor or dealer.


 Features
 --------
 - Embedded IDE-AT controller

 - Fast time to data: < 17 ms average seek time and 8.3 ms latency

 - Fast spin-up from standby: less than 2.5 seconds

 - Lightweight (GLS 85 4.2 ounces, GLS 256 6.1 ounces)

 - 96KB cache buffer
   - DisCache look.ahead read caching firmware for faster data
     retrieval
   - WriteCache sophisticated caching technique to streamline write
     commands
   - AccuWrite system battery backup permits accumulation of write
     request in the buffer

 - Multiple-zone recording for fast sustained data transfer rates

 - Low parts count for increased reliability

 - 112-bit Reed Solomon Error Correction Code (ECC), with 48-bit
   double burst correction

 - Defect Free Interface firmware for automatic reassignment of new
   defective sectors without reformatting

 - Automatic actuator shipping lock and dedicated landing zone

 - Ability to daisy-chain two drives on the interface

 - Excellent power management to preserve battery life

 - >350,000 hour projected field MTBF

 - Cable Select automatic master/slave configuration capability

 - Automatic diagnostic testing power-up

 - High shock resistance, 250g non-operating (2ms)

 - One-year warranty

 - Low profile, optimized for number of disk


 Seek Time
 ---------
       +-------------------------------+--------+
       |                               | GLS AT |
       +-------------------------------+--------+
       |Track-to-Track      msec. typ. |   5    |
       +-------------------------------+--------+
       |Average             msec. typ. |  17    |
       +-------------------------------+--------+
       |Full-Stroke         msec.      |  24    |
       +-------------------------------+--------+
       |Latency             msec. avg. |   8.3  |
       +-------------------------------+--------+


 AccuWrite
 ---------
 In a battery powered system, a drive is often placed into STANDBY
 mode after a period of inactivity. While this conserves power, this
 also makes the system relatively slow to respond to a write request
 since a couple seconds are required to exit the STANDBY mode by
 spinning up the disk. Fortunately, the battey power source which
 motivates power conservation also provides an option for fast
 response time.

 Unlike AC power, power from a battery is predictable. Indeed, almost
 all battery powered systems are constantly monitoring their power
 source so as to inform the user to save any work in progress to disk
 when the battery is getting critically low. Since the battery is
 already being used as a virtual UPS (uninterruptable power supply),
 the same predictable power can be used to assure the integrity of
 data stored in the drive's cache buffer.

 Thus, when AccuWrite is enabled and the drive is in STANDBY mode, any
 write request is storef in buffer memory and the write command
 acknowledged. The drive, however, takes no immediate action to store
 the buffer data to disk. Data in the buffer will be written to disk
 the next time the disk needs to be spin up. Spin up can be needed to
 satisfy a read request that cannot be satisfied from the buffer or if
 the write segment of the buffer becomes full.

 While AcuWrite provides for very fast response time, as well as lower
 power consumption by avoiding disk spin ups and improved reliablity
 by incurring fewer spin downs, the option requires the host to
 provide a controlled power down. That is, when the user turns off the
 machine, rather than simply cutting power to the drive, the host must
 issue a SLEEP command so that the drive knows enough to save the
 buffer data to disk and acknowledge the command that notifies the
 host that power to the drive can be safely cut.

 Byte 39, Bit 7 of the configuration block partially controls the
 AccuWrite option. The option is disabled at the factory with a sett-
 ing of zero but can be enabled with a setting one. Setting the Accu
 Write bit in the configuration block is necessary BUT NOT SUFFICIENT
 to enable AccuWrite option. Because many battery powered systems are
 also capable of running on AC only (without the presense of any
 battery backup), enabling AccuWrite not only requires that is
 configuration bit be set but also that Set Features command be used
 to Enable Write Cache (002H).

 Thus, to properly support the AccuWrite option, the host must be
 aware of its power source and issue the Set Features/Enable Write
 Cache command only when the source is a battery.


 Number of Defects
 -----------------
 The factory limit for the number of defects per surface is 42 or one
 per megabyte of surface capacity. Any spare capacity not consumed at
 the factory is available for reallocation of field grown defects.
 The logical block address of a sector found defective in the field is
 reassigned thus maintaining the Defect Free Interface. It is
 reassigned to a spare sector physically closet to the defective
 sector. The physical address of the defective sector is added to the
 defect list. The defect list provides for a maximum of 292 entries.


