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G O D R I V E   G L S   8 5   A T    QUANTUM
                                                      Native|  Translation
Form                 2.5"/SUPERSLIMLINE    Cylinders    1395|  722|     |
Capacity form/unform    85/      MB        Heads           2|   10|     |
Seek time   / track  17.0/ 5.0 ms          Sector/track     |   23|     |
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        0.9 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


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


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.
         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

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

 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
          +-++-+               +-++-++-+
          ++++++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

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


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.

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

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.


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

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.

- 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
   - WriteCache sophisticated caching technique to streamline write
   - 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  |

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.

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