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P R O D R I V E   E L S   8 5   S    QUANTUM
NO MORE PRODUCED                                      Native|  Translation
Form                 3.5"/SLIMLINE         Cylinders    1536|     |     |
Capacity form/unform    85/      MB        Heads           2|     |     |
Seek time   / track  17.0/ 5.5 ms          Sector/track     |     |     |
Controller           SCSI2 SINGLE-ENDED    Precompensation
Cache/Buffer            32 KB LOOK-AHEAD   Landing Zone
Data transfer rate    2.500 MB/S int       Bytes/Sector      512
                      3.000 MB/S ext ASYNC
Recording method     RLL 1/7                        operating  | non-operating
Supply voltage     5/12 V       Temperature *C         4 50    |    -40 65
Power: sleep          1.0 W     Humidity     %         8 85    |      5 95
       standby        1.0 W     Altitude    km    -0.060  3.000| -0.060 12.000
       idle           2.8 W     Shock        g        10       |     70
       seek           3.0 W     Rotation   RPM      3663
       read/write     3.0 W     Acoustic   dBA        34
       spin-up            W     ECC        Bit   96,REED SOLOMON
                                MTBF         h     250000
                                Warranty Month        24
Lift/Lock/Park     YES          Certificates     CSA,SDA,FCC,TUV,UL1950,VDE



  | +-+ HDA                                  +-+-+-+     ++ |XX
  +-| | Connector                            +-+-+-+     || |XX
  +-| | on Cable                            A0  A1 A2    || |XX
  | +-+                                                  || |XX I
  |                                                      || |XX N
  |                                                      ++ |XX T
  |                                    Terminating       ++ |XX E
  |                                    Resistor Packs    || |.X R
  |                                                      || |XX F
  |                                                      || |XX A
  |                                                      || |XX C
  |                                                      ++ |XX E
  |                                                         |XX
  |                                                         |X1
  |++LED                                                    |XX
  |++                                                       |XX Power
  +---------------------------------------------------------+  1



Jumper Setting

x = Jumper set at factory

On the drive printed circuit board assembly (PCBA), there are three
pairs of jumper pins that allow you set the drive's SCSI address.
When you change a jumper setting, the new setting is in effect when
the drive is next powered on.

Used in combination, the jumper setting accross pins A2, A1, and A0
determine the ProDrive ELS 42/85/127/170S hard disk drive's SCSI-bus
device identification (SCSI ID). By default, Quantum configures the
drive with a SCSI ID of six - that is, with jumpers installed across
the pins labeld A2 and A1 and no jumper installed across the pins
labeld A0.

 Default Settings for Address Jumpers
   |Jumper   |   Default Setting | Description                 |
   |  A2     |          ON       | A2, A1, and A0 are used in  |
   |  A1     |          ON       | combination to determine the|
   |  A0     |          OFF      | drive's SCSI ID.            |
   |         |                   | The default SCSI ID is 6.   |

 Note: ON  indicates a jumper is installed.
       OFF indicates that no jumper is installed.

SCSI ID Jumper Settings

   |  Jumper settings   |  SCSI ID |
   +------+------+------+          |
   |  A2  |  A1  |  A0  |          |
   |  OFF | OFF  | OFF  |     0    |
   |  OFF | OFF  | ON   |     1    |
   |  OFF | ON   | OFF  |     2    |
   |  OFF | ON   | ON   |     3    |
   |  ON  | OFF  | OFF  |     4    |
   |  ON  | OFF  | ON   |     5    |
   |x ON  | ON   | OFF  |     6    |
   |  ON  | ON   | ON   |     7    |

The SCSI bus supports up to eight devices, including the host system.
A device's identification number determines its priority and must
unique in the system.

 DC Power and pin connector assignments
      +------------+   pin 1    +12 VDC
      | 4  3  2  1 |   pin 2    +12 V Return (Ground)
      +------------+   pin 3    + 5 V Return (Ground)
                       pin 4    + 5 VDC

Note: Labels indicate the pin numbers on the connector. Pins 2 and 3
are connected together on the drive.



Notes on Installation

The mounting holes on the ProDrive ELS 42/85/127/170S hard disk drive
allow the drive to be mounted in any orientation.

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

For mounting, #6-32 UNC screws are recommended. To avoid stripping
the mounting-hole threads, the maximum torque applied to the screws
must not exceed 8 inch-pounds.

Terminating Resistors
At the factory, Quantum installs two resistor networks in sockets on
the drive PCBA to terminate the SCSI bus. Only the first device -
usually the host - and the last device on a SCSI bus should contain
terminating resistors. When installing the ProDrive ELS 42/85/127/
170S hard disk drive in any other position on the SCSI bus, remove
the terminating resistors.

The printed-circuit board assembly (PCBA) is very close to the
mounting holes. Clearance from the drive to any other surface -
except mounting surfaces - must be 3.5 millimeters (0.14 inches)
minimum. The specified screw length allows full use of the mounting-
hole threads, while avoiding damaging or placing unwanted stress on
the PCBA.

Caution: Using mounting screws that are no longer than the maximum
lengths, voids the warranty on the ProDrive ELS 42/85/127/170S.

The ProDrive ELS 42/85/127/170S hard disk drive operates without a
cooling fan, provided the ambient air temperature does not exceed
122*F (50*C).

Cable Connector
The ProDrive ELS 42/85/127/170S has a combination DC/SCSI cable
connector. A key slot on the header prevents the incorrect installa-
tion of the header connector on the SCSI cable. To prevent the header
connector on the SCSI cable from beeing plugged in backwards, use
only a keyed header connector.

The drive's combination DC/SCSI connector part number is Dupont
90910-001,2 in 1 SMT.

DC Power Connector
4-pin connector AMP P/N 1-480424-0 or equivalent

Loose-piece contacts AMP P/N 61173-4 or equivalent

Strip contacts AMP P/N 350078-4 or equivalent

 Power Sequencing
 You can apply the power in any order or manner, or short or open
 either the power or power-return line with no loss of data or damage
 to the disk drive. However, data may be lost in the sector being
 written at the time of power loss. The drive can withstand transient
 voltages of +10% to -100% from nominal while powering up or down.

Head/Disk Assembly
The head/disk assembly (HDA) contains the mechanical subassemblies of
the drive, which are sealed under a metal cover. The HDA consists of
the disk stack assembly, rotary positioner assembly, headstack
assembly, actuator latch assembly, and base casting which includes
the DC motor assembly. Assembly of the HDA takes place in a Class-
100 clean room. These subassemblies are not adjustable or field-

Caution: To ensure that the air in the HDA remains free of contamina-
tion, never remove or adjust its cover and seals. Tampering with the
HDA voids your warranty.

DC Motor Assembly
Integral with the base casting, the DC motor assembly is a rotating-
shaft, brushless DC spindle motor that drives the counter-clockwise
rotation of the disks.

Disk Caching
The ProDrive ELS 42/85/127/170S hard disk drive incorporates DisCache
a 32K (8K for the 42S) disk cache, to enhance drive performance. This
integrated feature can significantly improve system throughput. Read
and write cahcing can be enabled or disabled using the MODE SELECT

  | Operating Mode  | Measured Noise  | Distance |
  | Idle On Track   | 32 dBA (mean)   | 39.3 in  |
  |                 | 37 dBA (maximum)| (1 m)    |
  | Seeking (Random)| 36 dBA (mean)   | 39.3 in  |
  |                 | 41 dBA (maximum)| (1 m)    |



Formatted Capacity
At the factory, the ProDrive ELS 42/85/127/170S receives a low-level
format that creates the actual tracks and sectors on the drive.

Mean Time Between Failures (MTBF):

    250,000 Power On Hours (POH), typical usage

The Quantum MTBF numbers represent Bell-Core MTBF predictions at
ambient operating conditions and represent the minimum MTBF that
Quantum or a customer would expect from the drive. Quantum's ongoing
reliability testing and field return data has historically confirmed
an actual MTBF of twice the Bell-Core prediction.

Preventive Maintenance (PM): Not required

Mean Time To Repair (MTTR): 30 minutes

Start/Stop: 40,000 cycles (minimum)

Motor Clock
The Motor Clock provides speed control for the hall-less Spindle
Motor Driver.

Error Detection and Correction
As disk drive areal densities increase, obtaining extremely low error
rates requires a new generation of sophisticated error-correction
codes. Quantum ProDrive ELS 42/85/127/170S series hard disk drives
implement 112-bit single- and double-burst Reed-Solomon error-
correction techniques to reduce the uncorrectable read error rate to
less than one bit in 1 x 10(14) bits read.

When errors occurs, an automatic retry and a more rigorous double-
burst correction algorithm enable the correction of any sector with
two bursts of three incorrect bytes each or up to six multiple
random one-byte burst errors. In addition to these advanced error
correction capabilities, the drive's additional cross-checking code
and algorithm double checks the main ECC correction to greatly re-
duce the probability of miscorrection.

The drive's ECC can correct up to 48 bits of multiple random-burst
errors, provided that the incorrect bytes follow the guidelines for
correctablle double-errors. If more than two bytes in any one inter-
leave are in error, the sector cannot be corrected.

Defect Management
The ProDrive ELS 42/85/127/170S allocates one sector per cylinder as
a spare. In the factory, the media is scanned for defects. If a
sector on a cylinder is found to be defective, the address of the
sector is added to the drive's defect list. Sectors located
physically subsequent to the defective sector are assigned logical
block addresses such that a sequential ordering of logical blocks
results. This inline sparing technique is employed in an attempt to
eliminate slow data transfer that would result from a single defect-
ive sector on a cylinder.

If more than one sector is found defective on a cylinder, the inline
sparing technique is applied only to the first sector. The remaining
defective sectors are replaced with the nearest available spare
sectors on nearby cylinders. Such an assignment of additional
replacement sectors from nearby sectors rather than having a central
pool of spare sectors is an attempt to minimize the motion of the
actuator and head that otherwise would be needed to find a replace-
ment sector. The result is minimal reduction of data throughput.

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