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Hard Drive: QUANTUM: PRODRIVE LPS 525 AT 525MB 3.5"/SL IDE / AT

P R O D R I V E   L P S   5 2 5   A T    QUANTUM
NO MORE PRODUCED                                      Native|  Translation
Form                 3.5"/SLIMLINE         Cylinders        | 1017|     |
Capacity form/unform   525/      MB        Heads           6|   16|     |
Seek time   / track  10.5/ 3.0 ms          Sector/track     |   63|     |
Controller           IDE / AT              Precompensation
Cache/Buffer           512 KB SEGMENTED    Landing Zone
Data transfer rate    3.750 MB/S int       Bytes/Sector      512
                     10.000 MB/S ext DMA
Recording method     RLL 1/7                        operating  | non-operating
Supply voltage     5/12 V       Temperature *C           55    |    -40 65
Power: sleep              W     Humidity     %         8 85    |      5 95
       standby            W     Altitude    km            3.000|        12.000
       idle           8.0 W     Shock        g         6       |     60
       seek          11.2 W     Rotation   RPM      4500
       read/write    11.0 W     Acoustic   dBA        38
       spin-up            W     ECC        Bit   112,REED SOLOMON
                                MTBF         h     250000
                                Warranty Month        24
Lift/Lock/Park     YES          Certificates     CSA,FCC,TUV,UL1950,VDE



  | +-+                                +-+-+-+-+-+ +-+-+-+J9|XX
  | | |                                +-+++-+-+-+ +-+++++  |XX
  | | |                                   CS         SP DS  |XX
  | | |                                                     |XX
  | | |                                                     |XX AT-Bus
  | | |                                                     |.X  J1
  | | |                                                     |XX
  | | |                                                     |XX
  | +-+                                                     |XX
  |                                                         |XX
  |                                                         |X1
  |                                                         |
  |                                                         |xx
  |                                                         |xx
  |                                                         |xx
  | +-+LED                                                  |XX Power
  | +-+                                                     |XX  J3
  +---------------------------------------------------------+  1



Jumper setting

x = Jumper set at factory

 J9  Drive Select/Cable Select/Slave Present
   |DS    |CS    |SP    | Description                                |
   |OPEN  |OPEN  |OPEN  | Slave Drive                                |
   |OPEN  |OPEN  |CLOSED| Self Seek mode.                            |
  x|CLOSED|OPEN  |OPEN  | Master Drive                               |
   |      |      |      | Uses DASP- to check for the presence of a  |
   |      |      |      | Slave                                      |
   |CLOSED|OPEN  |CLOSED| Master Drive                               |
   |      |      |      | Uses the SP jumper to determine whether a  |
   |      |      |      | Slave is present, without checking PDIAG-  |
   |      |      |      | or DASP-                                   |
   |OPEN  |CLOSED|   X  | Slave or Master Drive, depending on the    |
   |      |      |      | state of the Quantum Cable Select signal   |
   |      |      |      | (pin 28) at the AT-bus connector.          |
   |      |      |      | If the signal state is set to OPEN         |
   |      |      |      | (grounded) then the drive is configured as |
   |      |      |      | if DS were CLOSED, described earlier. If   |
   |      |      |      | the Cable Select signal is set to CLOSED   |
   |      |      |      | (high), then the drive is configured as if |
   |      |      |      | DS were OPEN, described earlier.           |

X indicates the jumper setting does not matter.

 Caution: The CS and DS jumpers should never be installed at the same

DS Drive Select Jumper
You can also daisy-chain two drives on the IDE-bus Interface as
by using the DS (Drive Select) jumpers. If the DS jumper is
installed, the CS jumper must be removed (OPEN).

To configure a drive as the Master (Drive 0), a jumper must be
installed at the DS pins.

To configure a drive as the Slave (Drive 1), the DS jumper must be

The order in which drives are connected in a daisy chain has no

CS Cable Select Jumper
When two ProDrive LPS 525AT hard disk drives are daisy-chained
together, they can be configured as Master and Slave by using the CS
jumper or by using the DS jumper - BUT NOT BOTH at the same time. To
configure the two drives using the CS jumper, set the CS jumper to
CLOSED and the DS jumper to OPEN on each drive.

Once you install the CS jumper, the drive is configured as a Master
or Slave by state of the Cable Select signal, which is pin 28 at the
IDE-bus interface connector. Quantum uses pin 28 as a vendor-specific
pin; it does NOT conform to the function normally allocated for this
pin according to the ATA (AT Attachment).

If pin 28 is 0 (grounded), the drive is configured as a Master. If
it is a 1 (high), the drive is configured as a Slave. In order to
configure two drives in a Master/Slave relationship using the CS
jumper, you need to use a cable that provides the proper signal level
at pin 28 of the AT bus connector.

SP Slave Present Jumper
In combination with the current DS jumper settings, the Slave
Present jumper implements one of two possible configuratons:

When the drive is configured as a Master - that is, with the DS
jumper installed - the SP jumper should be installed on the Master
drive only if the Slave drive does not use the Drive Active/Slave
(DASP-) signal to indicate its presence.

When the drive is cnfigured as a Slave - that is, without the DS
jumper installed - the SP jumper enables the self-seek test. When
power is applied to the drive with the self-seek test enabled, the
drive executes seeks in a butterfly pattern.

If an error is encountered during the self-seek test, the test

 J3  DC Power
 |                                                        4-Pin   |
 |    40-Pin AT-Bus Interface Connector J1                DC Power|
 |   +---------------------------------------+            J3      |
 |   |o o o o o o o o o o o o o o o o o o o 1|  +-----+ +-------+ |
 |   |o o o o o o o o o o o o o o o o o o o o|  |     | |o o o o| |
 |   +---------------------------------------+  +-----+ +4-3-2-1+ |

 J3 Pin 1  +12 VDC
        2  +12 VDC Return (Ground)
        3  + 5 VDC Return (Ground)
        4  + 5 VDC

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



Notes on installation

The mounting holes on the ProDrive LPS 525AT hard disk drive allow
the drive to be mounted in any orientation.

Drive mounting orientation, clearance, and ventilation requirements
are described in the following subsections. For mounting, #6-32 UNC
screws are recommended.

Caution: The PCB is very close to the mounting holes. Do not
exceed the specified length for the mounting screws. The specified
screw length allows full use of the mounting-hole threads, while
avoiding damaging or placing unwanted stress on the PCB. To avoid
stripping the mounting-hole threads, the maximum torque applied to
the mounting screws must not exceed 8 inch-pounds.

Clearance from the drive - except mounting surfaces - to any surface
must be 0.10 inches minimum.

The LPS 525AT hard disk drives operates without a cooling fan,
provided the ambient air temperature does not exceed 131*F (55*C).

 J3 DC Power Connector
 The recommended mating connectors for the +5VDC and +12VDC input
 power are listed above.

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 may 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.

J1 IDE-Bus Interface Connector
On the ProDrive LPS 525AT hard disk drive, the IDE-bus
interface cable connector (J1 section C) is a 40-pin Universal

To prevent the possibility of incorrect installation, has been keyed
by removing Pin 20, which ensures that a connector cannot be
installed upside down.

For the mating J1 connector, recommended cable connectors include AMP
receptacle P/N 1-499506-0, with strain relief; P/N 1-746193-0 without
strain relief; or an equivalent. To key the cable connectors, you
must plug the hole that corresponds to pin 20.

Other recommended part numbers for the mating connector include:

40-Pin Connector 3M 3417-7000 or equivalent
Strain Relief 3M 3448-2040 or equivalent
Flat Cable (Stranded 28 AWG) 3M 3365-40 or equivalent
Flat Cable (Stranded 28 AWG) 3M 3517-40 (shielded) or equivalent

Drive Cable and Connector
The hard disk drive connects to the host computer by means of a
cable. This cable contains a 40-pin connector that plug into the
drive, and a 40-pin connector that plugs into the host computer. At
the host end, the cable plugs into either an adapter board residing
in a host expansion slot or an on-board IDE adapter.

If two drives are connected by a cable with two 40-pin drive
connectors, the cable-select feature of the ProDrive LPS 525AT
automatically configure each as drive 0 or drive 1 depending on the
configuration of pin 28 on the connector.

For Systems with Motherboard IDE Adapter
You can install the ProDrive LPS 525AT hard disk drive in an
AT-compatible system that contains a 40-pin AT-bus connector on the

To connect the drive to the motherboard, use a 40-pin ribbon cable.
Ensure that pin 1 of the drive is connected to pin 1 of the mother-
board connector.

For Systems with an IDE Adapter Board
To install a ProDrive 525AT hard disk drive in an AT-compatible
system without a 40-pin, AT-bus connector on its motherboard, you
need a third-party AT adapter board.

Adapter Board Installation
Carefully read the manual that accompanies your adapter board before
installing it. Make sure that all the jumpers are set properly and
that there are no addressing or signal conflicts. You must also
investigate to see if your AT-compatible system contains a
combination floppy and hard disk controller board. If it does, you
must disable the hard disk drive controller functions on the
controller board before proceeding.

Once you have disabled the hard disk drive controller functions on
the floppy/hard drive controller, install the adapter board. Again,
make sure that you have set all jumper straps on the adapter board
to avoid addressing and signal conflicts.

Connecting the Adapter Board and the Drive
Use a 40-pin ribbon cable to connect the drive to the board.

  1. Insert the 40-pin cable connector into the mating connector on
     the adapter board. Make sure that pin 1 of the connector matches
     with pin 1 on the cable.

  2. Insert the other end of the cable into the header on the drive.
     When inserting this end of the cable, make sure that pin 1 of
     the cable connects to pin 1 of the drive connector.

  3. Secure the drive to the system chassis by using the mounting

Base Casting Assembly
A single-piece aluminium-alloy base casting provides a mounting sur-
face for the drive mechanism and PCB. The base casting also acts as
the flange for the DC motor assembly. To provide a contamination-free
environment for the HDA, a gasket provides a seal between the base
casting and the metal cover that enclose the drive mechanism. In
addition, an E-coat seals the surface of the base casting to provide
additional contamination protection.

Air Filtration
ProDrive Series hard disk drives are Winchester-type drives. The
heads fly very close to the media surface, at a nominal flying height
of 4.5 microinches. Therefore, it is essential that the air
circulating within the drive be kept free of particles. Quantum
assembles the drive in a Class-100, purified air environment, then
sealing the drive mechanism under a metal cover. When the drive is in
use, the rotation of the disk forces the air inside of the drive
through an internal filter.



General Description
Quantum's ProDrive LPS 525AT hard disk drive is manufactured to meet
the highest product quality standards. The ProDrive LPS 525AT hard
disk drive uses nonremovable, 3 1/2-inch hard disks, and is available
with either a Small Computer System interface (SCSI) or an Advanced
Technology (AT) interface.

The LPS 525AT nomenclature refers to the capacity - 525MB - that is
available with this drive. The 525AT is available in the Low Profile
Series (LPS) family of Quantum drives.

Note: As defined by Quantum, a megabyte is 1,000,000 bytes.

Because the drive manages media defects and error recovery
internally, these operations are fully transparent to the user. The
innovative design of the ProDrive LPS 525AT hard disk drive enables
Quantum to produce a low-cost, high-reliability drive.

Hardware Requirements
The ProDrive 525AT hard disk drive is compatible with the IBM PC AT
and other computers that are compatible with the IBM PC AT. It
connects to the PC either by means of a third-party adapter board, or
by plugging a cable from the drive directly into a PC motherboard
that supplies an Integrated Drive Electronics (IDE) interface.

 Seek Times
   |Read-on-arrival  |   10 ms typ. |
   |Track-to-track   |  < 3 ms typ. |
   |Average write    |   11 ms typ. |
   |Full stroke      |   20 ms typ. |

System Startup and Operation
Once you have installed the ProDrive LPS 525AT hard disk drive and
adapter board (if required) in the host system, you are ready to
partition and format the drive for operation. To set up the drive
correctly, follow these steps:

1. Power on the system

 2. Run the SETUP program. This is generally on a Diagnostics or
    Utilities disk, or within the system's BIOS.

3. Enter the appropriate parameters.

    The SETUP program allows you to enter the types of optional hard-
    ware installed - such as the hard disk drive type, the floppy disk
    drive capacity, and the display adapter type. The system's BIOS
    uses this information to initialize the system when the power is
    switched on. For instructions on how to use the SETUP program,
    refer to the system manual for your PC.

    During the AT system CMOS setup, you must enter the drive type for
    the ProDrive LPS 525AT hard disk drive. The drive supports the
    translation of its physical drive geometry parameters such as
    cylinders, heads, and sectors per track, to a logical addressing
    mode. The drive can work with different BIOS drive-type tables of
    the various host systems.

4. Boot the system using the operating system installation disk.

The drive is shipped from the factory with a low-level format. A low-
level format is not required.

Formatted Capacity
At the factory, the ProDrive LPS 525AT receives a low-level
format that creates the actual tracks and sectors on the drive.

Data Transfer Rates
Data is transferred from the disk to the read buffer at a rate up to
3.75 MB/s maximum, 1.87 MB/s minimum. Data is transferred from the
read buffer to the AT bus at a rate up to 5.0 MB/s, using programmed

 Mean Time Between Failures (MTBF): 250,000 Power On Hours (POH),
                                    typical usage
 Component Life:                    5 years
 Preventive Maintenance (PM):       Not required

Error Detection and Correction
An error occurs whenever the drive fails to read data correctly -
because either the read does not complete its execution, or the drive
read data checksum is different than the recorded checksum. During a
read operation an error can occur while a sector's header or data is
being read. During a write operation, an error can occur while
reading a sector's header before the data is written.

Error Correction Code and ECC On-The-Fly
The ProDrive LPS 525AT hard disk drive implements a 96-bit single
and double burst Reed-Solomon error correction techniques. Single
burst errors of up to to 24 bits within one sector can be corrected
"on-the-fly", in real time as they occur, allowing a high degree of
data integrity with no impact to the drive's performance.

The drive does not need to re-read sector on the next disk revolu-
tion or apply ECC for those errors that are corrected on-the-fly.
Errors corrected in this manner are invisible to the host system. The
drive does not report a recovered error unless it needs more than two
disk revolutions to correct any error.

When errors cannot be corrected on-the-fly, an automatic retry and a
more rigorous double burts error correction algorithm enable the
correction of any sector with two burst of three incorrect bytes
each. In addition to this error correction capability, the drive's
implementation of an additional cross-checking code and algorithm
double checks the main ECC correction and greatly improves the
probability of miscorrection.

Automatic Actuator Lock
To ensure data integrity and prevent damage during shipment, all
ProDrive Series hard disk drives feature a dedicated landing zone and
Quantum's patented AIRLOCK. AIRLOCK, locks the headstack in the
landing zone. It consists of an airvane mounted near the perimeter of
the disk stack and a locking arm that restrains the actuator arm
assembly when the disks are not rotating.

When DC power is applied to the motor and the disk stack rotates, the
rotation generates an airflow on the surface of the disk. As the flow
of air across the airvane increases with disk ratation, the locking
arm pivots away from the actuator arm, enabling the headstack to move
out of the landing zone. When DC power is removed from the motor, a
return mechanism automatically pulls the actuator into the landing
zone, where the AIRLOCK holds it in place.

Disk Caching
The ProDrive LPS 525AT hard disk drive incorporates DisCache, a 512K
disk cache, to enhance drive performance. This integrated feature
can significantly improve system throughput. Read and write caching
can be enabled or disabled by using the Mode Select command.

There are 8 64Kbyte pages in the cache. Any given page (or segment)
holds the data from one track - thus there are a variable number of
sectors per segment depending on which recording zone is being used.
Two of the segments are used in a ping-pong manner, which provides 4
2-track cache segments.

Write Precompensation
A write precompensation circuit within the chip provides independent
control of early and late precompensation settings, which
accommodates the asymmetrical pulses produces by thin-film heads.

Defect Management
The ProDrive LPS 525AT allocates one sector per cylinder as a spare.
In the factory, the media is scanned for defects. If a sector is
found to be defective, the addrss of the sector is added to the drive
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 which would
result from a single defective 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 re-
placement 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 which would be otherwise needed to find a replace-
ment sector. The result in minimal reduction of data throughput.

Defects that occur in the field are known as grown defects. Inline
sparing is not performed on these grown defects.

Sectors are considered to contain grown defects if the double burst
ECC algorithm must be applied in order to recover the data. If this
algorithm is successful, the corrected data is stored in the newly
allocated sector. If the algorithm is not successful, the erroneous
data is stored in the new sector, and a flag is set in the data ID
field which causes the drive to report an ECC error each time the
sector is read. This condition remains until the sector is

 Track and Cylinder Skewing for ProDrive LPS 525AT
    | Zone  |Sectors  |Track | Cylinder|
    | Number|Per Track|Skew  | Skew    |
    |       |         |(Sec.)| (Sec.)  |
    |  15   |   42    |  09  |   12    |
    |  14   |   48    |  10  |   13    |
    |  13   |   51    |  11  |   14    |
    |  12   |   56    |  12  |   15    |
    |  11   |   64    |  13  |   17    |
    |  10   |   64    |  13  |   17    |
    |  09   |   67    |  14  |   18    |
    |  08   |   70    |  15  |   19    |
    |  07   |   73    |  15  |   20    |
    |  06   |   75    |  16  |   20    |
    |  05   |   80    |  17  |   22    |
    |  04   |   80    |  17  |   22    |
    |  03   |   85    |  18  |   23    |
    |  02   |   86    |  18  |   23    |
    |  01   |   89    |  19  |   24    |
    |  00   |   92    |  19  |   25    |

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