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Hard Drive: QUANTUM: PRODRIVE LPS 420 AT 421MB 3.5"/SL ATA2 FAST




P R O D R I V E   L P S   4 2 0   A T    QUANTUM
                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders        | 1010|     |
Capacity form/unform   421/      MB        Heads           4|   16|     |
Seek time   / track  13.0/ 5.0 ms          Sector/track     |   51|     |
Controller           IDE / ATA2 FAST/ENHA  Precompensation
Cache/Buffer           128 KB              Landing Zone
Data transfer rate    3.500 MB/S int       Bytes/Sector      512
                     13.300 MB/S ext DMA
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           3.3 W     Shock        g        10       |     70
       seek           6.7 W     Rotation   RPM      3600
       read/write     4.5 W     Acoustic   dBA        35
       spin-up            W     ECC        Bit   96,REED SOLOMON
                                MTBF         h     300000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC950,TUV,UL1950,VDE

Layout

QUANTUM PRODRIVE LPS 210/420AT PRODUCT MANUAL 81-106898-02, JUNE 94

  +--------------+------------------------------------------+
  |              |                       J13***    +-+-+-JP11XX
  +-+            |                          ***    +-+-+-+  |XX
  | +------------+--+                              SP DS CS |XX
  |              |  +                                       |XX
  |              |  +                                       |XX AT-Bus
  | +------------+--+                                       |XX
  +-+            |                                          |XX J11
  |              |                                          |XX
  |              |                                          |XX
  |              |                                          |XX
  |              |                                          |XX
  |              |                                          |XX
  |              |                                          |xx Power
  |              |                                          |XX
  |              |++LED                                     |xx Power
  |              |++J12                                     |XX
  +--------------+------------------------------------------+xx

Jumpers

QUANTUM PRODRIVE LPS 210/420AT PRODUCT MANUAL 81-106898-02, JUNE 94

Jumper setting
==============

 JP11  Drive Select/Cable Select/Slave Present
 ---------------------------------------------
   +------+------+------+--------------------------------------------+
   |DS    |CS    |SP    | Description                                |
   +------+------+------+--------------------------------------------+
   |OPEN  |OPEN  |OPEN  | Slave Drive                                |
   |      |      |      | Compatible with drive using PDIAG- line to |
   |      |      |      | handle Master/Slave communications         |
   +------+------+------+--------------------------------------------+
   |OPEN  |OPEN  |CLOSED| Slave Drive                                |
   |      |      |      | The PDIAG- and DASP- lines are not driven  |
   +------+------+------+--------------------------------------------+
   |CLOSED|OPEN  |OPEN  | Master Drive                               |
   |      |      |      | Uses DASP- to check for the presence of a  |
   |      |      |      | Slave (DEFAULT)                            |
   +------+------+------+--------------------------------------------+
   |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 IDE-bus interface          |
   |      |      |      | connector.                                 |
   |      |      |      | If the signal state is set to OPEN         |
   |      |      |      | (grounded) then the drive is configured as |
   |      |      |      | if DS were CLOSED, described above. If the |
   |      |      |      | Cable Select signal is set to CLOSED       |
   |      |      |      | (high), then the drive is configured as if |
   |      |      |      | DS were OPEN, described above.             |
   +------+------+------+--------------------------------------------+

X indicates the jumper setting does not matter.

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

DS Drive Select Jumper
-----------------------
You can configure two drives on the ATA Interface as Master (Drive 0)
and Slave (Drive 1) using the DS jumpers. Set the CS jumpers to OPEN
for each drive. Then, set the DS Jumper to CLOSED on one drive to
configure that drive as Master. Set the DS jumper to OPEN on the
other drive to configure as Slave.

 Note: For drives configured using the DS jumper, the order in which
       drives are connected in a daisy chain has no significance.

CS Cable Select Jumper
-----------------------
When two ProDrive LPS 210/420AT 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. 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 Cable Select
function but does not implement the spindle synchronization function.

Pin 28 is grounded - that is, set to OPEN - on the cable coming from
the host. This configures the first drive as Master. Then, pin 28 on
the connector at the second drive should be made an open circuit by a
cut in signal line 28 in the cable from the first drive, so it
becomes high - that is, set to CLOSED - due to a pull-up in the
second drive. This configures the second drive as a Slave.

SP Slave Present Jumper
------------------------
The SP jumper normally is not needed. However, when the ProDrive LPS
210/420AT is configured as Master and is connected to a Slave
drive that does not implement the Drive Active/Slave Present (DASP-)
signal, it is necessary to set the SP jumper to CLOSED on the
ProDrive LPS 210/420AT.

Install

QUANTUM PRODRIVE LPS 210/420AT PRODUCT MANUAL 81-106898-02, JUNE 94

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

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

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

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

Mounting
--------
The mounting holes on the ProDrive LPS 120/240AT hard disk drive
allow the drive to be mounted in any orientation.

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
---------
Clearance from the drive - except mounting surfaces - to any surface
must be 1.25 mm (0.05 inches) minimum.

Ventilation
-----------
The LPS 210/420AT hard disk drives operates without a cooling fan,
provided the ambient air temperature does not exceed 122*F (50*C).

Drive Cable and Connector
-------------------------
The hard disk drive connects to the host computer by means of a
cable. This cable contains a 40-pin computer that plugs into the
drive, and a 40-pin conector 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 210/420AT
automatically configures each as drive 0 or drive 1 depending on the
configuration of pin 28 on the connector.

IDE-Bus Interface
-----------------
A 40-pin IDE interface connector on the motherboard or an adapter
board provides an interface between the drive and a host that uses an
IBM PC AT bus. The IDE interface contains bus drivers and receivers
compatible with the standard AT bus. The AT-bus interface signals
D8-D15, INTRQ and IOCS16- require an IDE adapter board to have an
extended I/O-bus connector.

The IDE interface buffers data and control signals between the drive
and the AT bus of the host system, and decodes addresses on the host
address bus. The Command Block Registers on the drive accept commands
from the host system BIOS.

NOTE
Some host systems do not read the Status Register after the drive
issues an interrupt. In such cases, the interrupt may not be
acknowledged. To overcome thos problem, you may have to configure a
jumper on the motherboard or adapter board to allow interrupts to be
controlled by the drive's interrupt logic. Read your motherboard or
adapter board manual carefully to find out how to do this.

J11A/B/C DC Power/Interface Connector
--------------------------------------
The drive's DC power can be applied to either section A or B.
The IDE-bus interface (40-pin) uses section C.

                J11 AT (40-pin)/DC (4-Pin & 3-Pin)
                Combination Connector
 +----------------------------------------------------------------+
 |                                               3-Pin    4-Pin   |
 |    40-Pin AT (J11 Section C)                  DC Power DC Power|
 |   +---------------------------------------+   J11B     J11A    |
 |   |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 o o| |
 |   ++-------------------+------------------+  +3-2-1+ +4-3-2-1+ |
 +----+-------------------+---------------------------------------+
      |                   |
      Pin 40              Missing Pin
                          Pin 20

 J11A Pin 1  +12 VDC
          2  +12 VDC Return (Ground)
          3  + 5 VDC Return (Ground)
          4  + 5 VDC

 J11B Pin 1  + 5 VDC
          2  +12 VDC
          3  Ground

 DC Power (J11 A and B)
 ----------------------
 The recommended mating connectors for the +5VDC and +12VDC input
 power are listed above.

J11A 4-Pin Connector: AMP P/N 1-480424-0

       Loose piece contacts: AMP P/N 61173-4

       Strip contacts:       AMP P/N 350078-4

J11B 3-Pin Connector: Molex P/N 39-01-0033

       Loose piece contacts: Molex P/N 39-00-00341

       Strip contacts:       Molex P/N 39-00-0023

Labels indicates the pin numbers on the connectors.

IDE-Bus Interface Connector (J11C)
----------------------------------
On the ProDrive LPS 210/420AT hard disk drive, the IDE-bus interface
cable connector (J11 section C) is a 40-pin Universal Header.

To prevent the possibility of incorrect installation, make sure the
connector is keyed by removing Pin 20. Removing this pin ensures the
connector cannot be installed upside down.

For mating with J11 section C, recommended cable connectors include
the following parts or their equivalents:

AMP receptacle with strain relief P/N 1-499506-0

AMP receptacle without strain relief P/N 1-746193-0

To key the cable connector, 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

 J12 LED Connector
 -----------------
 The LED connector may be used to connect an external LED for the
 purpose of monitoring drive activity. A 220-ohm resistor is connected
 in series from the +LED pin to +5 volts. The -LED pin is connected
 to a switching transistor on the drive that turns on and lights the
 LED when the disk is performing a read or write operation. When no
 read or write operation is taking place, the transistor turns off and
 the LED is extinguished. The recommended mating connector parts are:
 Two-position housing: Molex P/N 51021-0200,
 Loose-piece contacts: Molex P/N 50058-8100, or equivalent.

 Pin 1 -LED, Pin 2 +LED.

For Systems with a Motherboard AT Adapter
=========================================
You can install the ProDrive LPS 210/420AT hard disk drive in an
AT-compatible system that contains a 40-pin AT-bus connector on the
motherboard.

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 LPS 210/420AT hard disk drive in an AT-
compatible system without a 40-pin, IDE-bus connector on its
motherboard, you need a third-party IDE-compatible 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 disl controller board. If it does, you
must disable the hard disk drive controller functions on the
controller board before processing.

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 of
     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
     screws.

Electrical Characteristics
--------------------------
All signals are transistor-transistor logic (TTL) compatible - with
logic 1 greater than 2.0 volts and less than 5.25 volts; and logic 0
greater than 0.2 volts and less than 0.8 volts. Neither the adapter
board, motherboard interface, or drives require terminating
resistors.

Air Filtration
--------------
The ProDrive LPS 210/420AT hard disk drives are Winchester-type
drives. The heads fly very close to the media surface. 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 seals the drive with a metal cover. When the
drive is in use, the rotation of the disks forces the air inside the
drive through an internal filter. The highest air pressure within the
HDA is at the outer perimeter of the disks. A constant stream of air
flows through a 0.3-micron circulation filter positioned in the base
casting.

Features

QUANTUM PRODRIVE LPS 210/420AT PRODUCT MANUAL 81-106898-02, JUNE 94

General Description
-------------------
Quantum's ProDrive Low Profile Series (LPS) 210AT/420AT hard disk
drives are a part of a family of high-performance, 1-inch-high hard
disk drives manufactured to meet the highest product quality
standards. ProDrive LPS hard disk drives use nonremovable, 3 -inch
hard disks, and are available with a Small Computer System Interface
(SCSI) or Advanced Technology (AT) interface.

The ProDrive LPS 210AT/420AT hard disk drives feature an embedded IDE
drive controller and use ATA commands to optimize systems
performance. The drive manages media defects and error recovery
internally, these operations are transparent to the user.

 Seek Times
 ----------
   +------------------+--------------+
   |Track-to-track    |    5 ms typ. |
   +------------------+--------------+
   |Average seek      |   15 ms typ. |
   +------------------+--------------+
   |Full stroke       |   31 ms typ. |
   +------------------+--------------+
   |Rotational Latency|    8.33 ms   |
   +------------------+--------------+

System Startup and Operation
----------------------------
Once you have installed the ProDrive LPS 210/420AT 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 210/420AT hard disk drive. This procedure allows
    the system to recognize the drive by translating its physical
    drive parameters such as cylinders, heads, and sectors per
    track, into a logical addressing mode. The drive can work with
    different BIOS drive-type tables of the various host systems.
    You can choose any drive type that does not exceed the capacity of
    the drive.

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

Formatted Capacity
------------------
At the factory, the ProDrive LPS 210/420AT 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
3.945 MB/s in burst. Data is transferred from the read buffer to the
AT bus at a rate up to 6.0 MB/s, using programmed I/O. If IORDY is
used, then this transfer rate can be increased to 11 MB/s. Using the
Multiword DMA protocol, transfer rates of 13.3 MB/s. are achievable
(burst mode only).

 Reliability
 -----------
 Mean Time Between Failures (MTBF): 300,000 Power On Hours (POH),
                                    typical usage
 Component Life:                    5 years
 Preventive Maintenance (PM):       Not required
 Start/Stop:                        20,000 cycles (minimum)

The Quantum MTBF numbers represent Bell-Core MTBF predictions and
represent the minimum MTBF that Quantum or a customer would expect
from the drive.

Error Detection and Correction
------------------------------
As disk drive areal densities increase, obtaining extremely low error
rate requires a new generation of soghisticated error-correction
codes. Quantum ProDrive LPS 210/420AT 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 occur, an automatic retry and a more rigorous double-
burst correction algorithm enable the correction of any sector with
two burst 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 reduce the
probability of miscorrection.

Automatic Actuator Lock
-----------------------
To ensure data integrity and prevent damage during shipment, the
drive uses a dedicated landing zone and Quantum's patented AIRLOCK.
AIRLOCK, locks the headstack in the landing zone. It consists of an
air vane mounted near the perimeter of the disk stack and a locking
arm that restrains the actuator arm assembly.

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 air vane 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, an
electric return mechanism automatically pulls the actuator into the
landing zone, where the AIRLOCK holds it in place.

Disk Caching
------------
The ProDrive LPS 210/420AT hard disk drive incorporates DisCache, a
96K 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 SET CONIGURATION command.

Defect Management
-----------------
The ProDrive LPS 210/420AT 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.

Track and Cylinder Skewing
--------------------------
Track and cylinder skewing in the ProDrive LPS 210/420AT minimizes
latency time and thus increases data throughput.

Track Skewing
-------------
Track skewing reduces the latency time that results when the drive
must switch read/write heads to access sequential data. A track skew
is employed such that the next logical sector of data to be accessed
will be under the read/write head once the head switch is made and
the data is ready to be accessed. Thus, when sequential data is on
the same cylinder but on a different disk surface, a head switch is
needed but not a seek. Since the sequential head-switch time is well
defined on the ProDrive LPS 210/420AT (6 ms worst case), the sector
addresses can be optimally positioned across track boundaries to
minimize the latency time during a head switch.

Cylinder Skewing
----------------
Cylinder Skewing also is used to minimize the latency tome associated
with a single-cylinder seek. The next logical sector of data that
crosses a cylinder boundary is positioned on the drive such that
after a single-cylinder seek is performed, and when the drive is
ready to continue accessing data, the sector to be accessed is
positioned directly under the read/write head. Therefore, the
cylinder skew takes place between the last sector of data on the last
head of a cylinder and the first sector of data on the first head of
the next cylinder. Since single-cylinder seeks are well defined on
the ProDrive LPS 210/420AT, the sector addresses can be optimally
positioned across cylinder boundaries to minimize the latency time
associate with a single-cylinder seek.

Error Reporting
---------------
At the start of a command's execution, GoDrive 40/80AT hard disk
drives check the COMMAND register for any conditions that would lead
to an abort command error. The drive then attempts execution of the
command. Any new error causes execution of the command to terminate
at the point at which it occurred. The following table list the valid
errors for each command.

 -----------------+--------------------------+---------------------+
 COMMAND          |ERROR REGISTER            |STATUS REGISTER      |
                  +--------------------------+---------------------+
                  |BBK|UNC|IDNF|ABRT|TK0|AMNF|DRDY|DWF|DSC|CORR|ERR|
 -----------------+---+---+----+----+---+----+----+---+---+----+---+
 Check Power Mode |   |   |    | V  |   |    | V  | V | V | V  | V |
 Read Defect List | V | V | V  | V  |   |  V | V  | V | V | V  | V |
 Exec. Drive Diag.|   |   |    |    |   |    |    |   |   |    | V |
 Format Track     |   |   | V  | V  |   |    | V  | V | V |    | V |
 Identify Drive   |   |   |    | V  |   |    | V  | V | V |    | V |
 Initi. Parameters|   |   |    |    |   |    | V  | V | V |    |   |
 Inval.Cmnd. Codes|   |   |    | V  |   |    | V  | V | V |    | V |
 Read Buffer      |   |   |    | V  |   |    | V  | V | V |    | V |
 Read DMA         | V | V | V  | V  |   |  V | V  | V | V | V  | V |
 Read Configurati.| V | V | V  | V  |   |  V | V  | V | V | V  | V |
 Read Multiple    | V | V | V  | V  |   |  V | V  | V | V | V  | V |
 Read Sectors     | V | V | V  | V  |   |  V | V  | V | V | V  | V |
 Read Sec. Long   | V |   | V  | V  |   |  V | V  | V | V |    | V |
 Read Verify Sec. | V | V | V  | V  |   |  V | V  | V | V | V  | V |
 Recalibrate      |   |   |    | V  | V |    | V  | V | V |    | V |
 Seek             |   |   | V  | V  |   |    | V  | V | V |    | V |
 Set Configuration| V |   | V  | V  |   |    | V  | V | V |    | V |
 Set Features     |   |   |    | V  |   |    | V  | V | V |    | V |
 Set Multiple Mode|   |   |    | V  |   |    |    |   |   |    | V |
 Write Buffer     |   |   |    | V  |   |    |    |   |   |    | V |
 Write DMA        | V |   | V  | V  |   |    | V  | V | V |    | V |
 Write Multiple   | V |   | V  | V  |   |    | V  | V | V |    | V |
 Write Sectors    | V |   | V  | V  |   |    | V  | V | V |    | V |
 Write Sec. Long  | V |   | V  | V  |   |    | V  | V | V |    | V |
 -----------------+---+---+----+----+---+----+----+---+---+----+---+

Key:
V = Valid errors for each command
ABRT = Abort command error
AMNF = Data address mark not found error
BBK = Bad block detected
CORR = Corrected data error
DRDY = Drive not ready detected
DSC = Disk seek complete not detected
DWF = Drive write fault detected
ERR = Error bit in the Status Register
IDNF = Requested ID not found
TK0 = Track zero not found error
UNC = Uncorrectable data error

General

QUANTUM ATA TIPS

Comparing the Fast ATA and Enhanced IDE Disk Drive Interfaces
-------------------------------------------------------------
Why are Fast ATA and Fast ATA-2 Important?
Faster data transfer rates are important because a computer is
only as fast as its slowest component. Today's 486, Pentium, and
PowerPC-based computers offer processor speeds many times faster
than only two years ago. Bus speeds have also increased with the
inclusion of 32-bit VL and PCI local buses, which have a maximum
data transfer rate of 132 MB/second.

Faster buses mean that data can be transferred from the storage
device to the host at greater speeds. Fast ATA and Fast ATA-2 allow
disk drives to store and access this data faster, thus enhancing the
other high-speed components in the system and removing the
bottleneck associated with older ATA/IDE drives. In short, Fast
ATA helps bring very high performance to desktop PC systems.

In addition, when compared to SCSI, Fast ATA is the least expensive
way to achieve faster disk drive data transfer rates and higher
system performance. The implementation of Fast ATA through system
BIOS provides performance without incremental hardware co sts.
Older systems can support Fast ATA using an inexpensive host
adapter.

Fast ATA and Fast ATA-2 are easy to implement in either VL or PCI
local bus systems. The hardware connection can be made using a
standard 40-pin ATA ribbon cable from the drive to the host
adapter. Direct connection to the motherboard further eases
integration when provided by the motherboard supplier.

Once connected, the high data transfer capabilities of Fast ATA can
be enabled through the data transfer options found in most CMOS BIOS
setup tables. Newer versions of BIOS provide automatic configuration
for Fast ATA drives.

Fast ATA can improve efficiency by allowing more work to be
completed in less time because the computer moves data faster.
Graphic, multimedia, and audio/visual software users will benefit
most because the speed of those applications, which work with large
blocks of data, are transfer-rate dependent.

The Fast ATA and Enhanced IDE interfaces both use the local bus to
speed data transfer rates. Enhanced IDE also uses the same PIO modes
as Fast ATA, although a data transfer rate equal to the PIO mode 4
rate has not been announced for Enhanced IDE. The major differences
between Fast ATA and Enhanced IDE are that the latter includes
three distinct features in addition to fast data transfer rates.
The additional features of Enhanced IDE are as follows:

High-capacity addressing of ATA hard drives over 528 MB -
a BIOS and device driver function.

Dual ATA host adapters supporting up to four hard disk drives per
computer system - a function of BIOS, operating system, and host
adapter, not the drive.

Support for non-hard disk drive peripherals such as CD-ROMs -
a function of BIOS and the operating system, not the drive

Each of these features supports improved functionality at a system
level, a positive development for the industry and end users.
However, support for all three features requires an extremely high
degree of integration and revisions to operating systems and hard-
ware, in addition to BIOS changes. Specific support is required not
only for the storage peripherals but also for host adapters, core
logic, the system bus, BIOS, and operating systems - virtually every
major block of PC architecture.

There is no central industry-supported standard that controls the
features of Enhanced IDE. With no standard, some products sold as
"Enhanced" may provide only one of the three features of Enhanced
IDE. For example, fast data transfer rate support is be coming
standard on mid-range and high-end local bus systems. This single
feature could satisfy the users immediate requirements without the
need for the other features of Enhanced IDE.

In the future, if the same system is upgraded to add the remaining
features of Enhanced IDE, users may be forced to purchase an Enhanced
IDE package that contains a feature already installed. This could
result in unnecessary costs, integration conflicts, and in-
compatibility with original factory implementations.

Fast ATA, on the other hand, represents only the fast data transfer
rates for ATA hard drives (support for PIO mode 3 or 4 and DMA mode
1 or 2). Fast ATA and Fast ATA-2 data transfer rates can be easily
achieved when the system BIOS and hard drive suppo rt the PIO and
DMA protocols.

BIOS that supports Fast ATA does not necessarily support high-
capacity addressing, dual host adapters or non-hard drive
peripherals. But these features are being introduced independently
by system manufacturers in order to compete in the PC marketplace.

All of Quantum's disk drives designed for PCs now support Fast ATA,
and new products with Fast ATA support will be introduced in early
1995. The drives are also fully backward compatible with older ATA/
IDE (non-Fast ATA) BIOS.

The Quantum drives support both the Extended CHS (Cylinder Head
Sector) and LBA (Logical Block Address) addressing methods in
overcoming the 528 MB DOS capacity barrier. Quantum drives can also
be used with dual host adapters.

Finally, there are no incompatibilities with Quantum hard drives
that would prevent computer systems from supporting non-hard drive
peripherals.

Quantum drives that support Fast ATA include the following families:

Quantum ProDrive LPS 170/210/340/420
Quantum ProDrive LPS 270/540
Quantum Maverick 270/540
Quantum Lightning 365/540/730
Quantum Daytona 127/170/256/341/514

Fast ATA and Fast ATA-2 are important technologies that can take
advantage of the performance provided by the latest high-speed
microprocessors and bus architectures. The high-speed interfaces
are based on industry standard specifications and are the least
expensive way to achieve faster disk drive data transfer rates.
Fast ATA is not a group of features that requires an extremely
high level of integration, and only represents the fast data transfer
rates for ATA hard drives (PIO mode 3 or 4 and DMA mode 1 or 2).
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