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Hard Drive: IBM: 0661-371 320MB 3.5"/HH SCSI2 SE

0 6 6 1 - 3 7 1    IBM
NO MORE PRODUCED                                      Native|  Translation
Form                 3.5"/HH               Cylinders     949|     |     |
Capacity form/unform   320/  371 MB        Heads          15|     |     |
Seek time   / track  12.5/ 4.0 ms          Sector/track     |     |     |
Controller           SCSI2 SINGLE-ENDED    Precompensation
Cache/Buffer            64 KB DUAL-PORTED  Landing Zone
Data transfer rate    2.000 MB/S int       Bytes/Sector      512
                      4.000 MB/S ext SYNC
Recording method     RLL 1/7                        operating  | non-operating
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |      5 99
       standby            W     Altitude    km    -0.305  3.048| -0.305  9.144
       idle          11.9 W     Shock        g        10       |     35
       seek               W     Rotation   RPM      4316
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   48
                                MTBF         h     150000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC380,IEC435,UL19...



  |+-------------------SCSI--------------------------+ +Power--+|
  ||o o o o o o o o o o o o o o o o o o o o o o o o 1| |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 o o| |       ||
  |+-------------------------------------------------+ +-------+|
  |  +---------+  +----+                                        |
  |+-+o o o   o|  |    |Vent Hole                               |
  || |o o o o o|  +----+                                        |
  || +---------+  +----+                                        |
  ||Option Jumper |    |Vent Hole                               |
  ||Block         +----+                                        |
  ||                                                            |
  |+Bit 0         +----+                                        |
  |               |    |Vent Hole                               |
  |               +----+                                        |



Jumper Setting

Option Jumper Block
The jumper block is used to select the SCSI device ID and to control
spindle motor start. All signal option lines can be driven from one
ground line but the ground pins should only be used for driving
option lines.

                                +------- C3; Bit2 (MSB)
              C2; Bit1 -------+ | +----- Blank Polarity
        C1; Bit0 (LSB) -----+ | | | +--- D2; Remote Start
                           |o o o   o|
                           |o o o o o|
             Ground A1 -----+ | | | +--- B2; Ground
             Ground A2 -------+ | +----- B1; *
                                +------- A3; Ground

 * If pin B1 is high on power up, (high is floating), the B1 pin will
   be used as an output for Motor Active, (high=motor off, low=motor
   on); and if pin B1 is low on power up, pin B1 stays as an input.

If the remote start shunt is not on, the file starts by SCSI command

SCSI Address Selection

   | ADDRESS  |        Jumpers        |
   |          | Bit 2 | Bit 1 | Bit 0 |
   |    0     | OPEN  | OPEN  | OPEN  |
   |    1     | OPEN  | OPEN  | CLOSED|
   |    2     | OPEN  | CLOSED| OPEN  |
   |    3     | OPEN  | CLOSED| CLOSED|
   |    4     | CLOSED| OPEN  | OPEN  |
   |    5     | CLOSED| OPEN  | CLOSED|
   |    6     | CLOSED| CLOSED| OPEN  |
   |    7     | CLOSED| CLOSED| CLOSED|



Notes on Installation

The drive can be mounted in the following posistions listed below.

- Bottom Side Down

- Right Side Down

- Left Side Down

- Rear Side Down

Four mounting holes are provided on the bottom of the drive, and two
mounting holes are provided on each side of the drive.

The torque applied to the mounting screws is not exceed 1.0 Newton-
meters 0.1 Newton-meters.

A minimum of 2 mm clearance MUST be given to the bottom surface
except at the bottom mounting holes. For proper cooling it is
suggested that a clearance of 6 mm be provided under the file and on
top of the file.

Precaution must be taken so as not to block any of the vent holes on
the side and ends of the file.

The top of the drive will not exceed the height dimension by more
than 2 millimeters during a 35 G 20 millisecond drop.

 Power Connector
      +------------+   pin 1    +12 V
      | 1  2  3  4 |   pin 2    GND
      +------------+   pin 3    GND
                       pin 4    + 5 V

The DC power connector is designed to mate with AMP part 1-480424-0
using AMP pins part 350078-4 (strip) or part 61173-4 (loose piece),
or their equivalent.

SCSI Signal Connector
The SCSI signal connector is a 50-pin connector Molex part #70246
meeting ANSI/SCSI specifications.

SCSI Bus Terminators
The file has no internal SCSI bus terminators. The user is
responsible for properly terminating and powering the SCSI bus in the
using system.

AMP #88-4163-081-1 or DATA MATE DM500-06-8 or equivalent external
terminator may be used for termination of the file.

For a single-ended cable a 50 conductor flat cable or a 25 signal
twisted cable can be used with a maximum length of 6.0 meters, and a
stub length not to exceed 0.1 meters.

This file has an internal stub length of 0.077 meters. To remain
compliant with ANSI, the SCSI bus cable must not add more than 0.023
meters additional stub length.

The read/write heads are mounted on the actuator. The actuator is a
swing-arm assembly driven by a voice coil motor. A closed-loop
positioning servo controls the movement of the actuator. A dedicated
servo surface and head supplies feedback to the positioning servo to
keep the read/write heads centered over the desired track. During
seeks, the servo head provides track crossing information to the

The actuator assembly is balanced to allow vertical or horizontal
mounting without adjustment.

When the unit is stopped (via a SCSI command or power off condition)
the actuator automatically moves the heads to a dedicated landing
zone outside of the data area, where the actuator is locked.



- Industry-standard interface: ANSI/SCSI-2

- Thermal compensation

- Integrated controller

- Logical block addressing

- Implied seeks

- SCSI disconnect and reconnect capability

- SCSI bus parity

- Rotary voice coil motor actuator

- Closed-loop actuator servo

- 1 : 1 interleave

- Buffer memory parity

- Read buffer look-ahead

- Self-diagnostics on power-up

- Automatic retry and data correction on read errors

- In-line alternate sector assignment for high performance

- Reassignment of new defective sectors without the need to reformat

- Automatic actuator lock

- Dedicated head landing zone

- No preventative maintenance required

- Two Field Replaceable Units (FRU's): Electronic and File

 Seek Time
       |                                  |0661-371|
       |Track-to-Track         msec. typ. |   2    |
       |Average                msec. typ. |  11.5  |
       |                       msec. max. |  25    |
       |Latency                msec. avg. |   6.95 |

SCSI Data Transfer Rate Specification
The SCSI data transfer rate is dependent on the mode, either
synchronous or asynchronous.

When the file is configured for a synchronous data transfer rate of
4.0 MB/sec (instantaneous), the average SCSI data transfer rate is
realized will be at least 3.8 MB/sec.

The asynchronous data transfer rate is depentend on both the
initiator and target delays to the assertion and negation of the SCSI
REQ and ACK signals. It is also dependent on SCSI cable delays. The
file will assert or negate the REQ signal within 175 nsec of the
assertion or negation of the ACK signal.

The SCSI data transfer rate specification only applies to the Data
phase for logical block data for Read, Write, Write and Verify, etc.
commands is not specified.

 SCSI Bus Electrical Characteristics
 The following are for the Western Digital WD33C93A SCSI Bus Interface
 Controller is used in this drive.
  |Symbol|Input Characteristics     |Min|Max|Units|Conditions     |
  |IIL   |Input leakage             |   |10 | uA  |VIN=0.4 to VCC |
  |IOL1  |SCSI output leakage       |   |50 | uA  |VOUT=0.5 to VCC|
  |      |(inactive)                |   |   |     |               |
  |IOL2  |Output leakage (tri-state)|   |10 | uA  |VOUT=0.4 to VCC|
  |VIH   |Input high voltage        |2.0|   | V   |               |
  |VIL   |Input low voltage         |   |0.8| V   |               |
  |VIHYS |Schmitt trigger input     |0.2|   | V   |               |
  |      |hysterisis (all SCSI pins)|   |   |     |               |
  |VOH   |Output high voltage       |2.4|   | V   |IO=-400uA      |
  |VOL1  |SCSI output low voltage   |   |0.5| V   |IO=48.0mA      |
  |VOL2  |Output low voltage        |   |0.4| V   |IO=4.0mA       |
  |      |(all others)              |   |   |     |               |
  |VCC   |Supply current            |   |20 | mA  |Ta=+25 dec C.  |
 NOTE  Ta = 0 to 70 deg. C
       VCC = +5V   0.25V, GND = 0V

 Acoustics Levels
 Upper Limit Sound Power Requirements (Bels)
 |         |Octave Band Center Frequency (Hz) | A-weighted  |
 |Mode     | 125| 250| 500| 1 k| 2 k| 4 k| 8 k|Max. Sum     |
 |Idling   | 4.5| 3.5| 3.3| 3.5| 4.3| 4.3| 4.0|   4.75      |
 |Operating| 4.5| 4.0| 3.6| 3.8| 4.6| 4.6| 4.3|   5.00      |
 The operating mode is simulated by seeking at a rate between 12 and
 15 seeks per second.

ECC Implementation
Six bytes of ECC are provided for each data block. The code has been
configured to guarantee accurate correction of any single burst error
of 11 bits or less. Single burst errors of length 12-27 bits are
guaranteed to be accurately detected as uncorrectable errors. Single
burst errors of length 28-48 bits are always detected, however, it is
possible that miscorrection may occur. The overall miscorrection
probability for length 28-48 bit errors is approximately 1.5 E -8.
Single burst errors that are more than 48 bits in length will be
subject to the same miscorrection probabilities, and additionally,
may not be detected by code. The misdetection probability for errors
greater than 48 bits long is approximately 3.5 E -15.

Head/Disk/Spindle Assembly
The head and disk assembly (HDA) is assembled in a clean room
environment and contains the disks and actuator assembly. Air is
constantly circulated and filtered through a high-efficiency filter
when the drive is operational. Venting of the HDA is accomplished via
an absolute breather filter.

The HDA is shock mounted to minimize transmission of vibration
through the chassis.

The spindle is driven directly by an in-hub, brushless DC drive
motor. The motor is dynamically balanced to ensure a low level of
vibration. Dynamic braking is used to quickly stop the spindle.

Thermal Compensation
The file periodically compensates certain all heads to account for
movements caused by thermal changes. The compensation process is
initiated automatically by the file and may result in performance
degradation while in progress.

The compensation process is started every five minutes during the
first hour after power is applied, and every twenty five minutes
thereafter. The heads are compensated one at a time until all heads
are done. It takes 140 msec to compensate one head; about 1.8 sec to
compensate all heads.



SCSI Installation Guide Generic

Installation requirements
To install a drive inside your computer or in an external storage
enclosure for SCSI devices, you must have:

 1 The documentation that came with your computer or storage

2 The documentation that came with your hard drive.

3 A small, flat blade screwdriver.

 4 A SCSI controller, which is either built into the system board or
   on an adapter inside your computer.

 5 An installation kit, if it is required for your computer. Contact
   your place of purchase if you are not sure.

 6 If you are installing this into a PS/2 computer, you will also need
   the up-to-date backup copy of your reference diskette and
   diagnostic diskette.

WARNING: Do not open the static-protective bag containing the drive
until instructed to do so. Static electricity can damage the drive.

Hardware and software considerations
Operating system
The operating system and hardware are two of the factors that
determine the number of drives a computer can support. The manuals
for your computer and operating system can help you to determine the
number and type of hard disk drives you can use.

Power supply
Two factors that determine the number of internal drives that a
computer or SCSI storage enclosure can support are:

1 The available current of the power supply

2 The nominal operating current of each drive installed

Most computer power supplies have output over-current protection. If
the total allowed current is exceeded, the power supply shuts down.
The computer must be turned off and turned on again.

SCSI ID Each SCSI device connected to a SCSI adapter must be assigned
a unique SCSI identification number (ID). The ID you assign to this
device depends on the number of SCSI devices connected to the SCSI
adapter and the SCSI IDs already assigned to those devices.

Note: All IBM SCSI controllers support SCSI IDs 6 through 0. (ID 7 is
used for the SCSI controller.) Some SCSI controllers support SCSI IDs
15 through 8. If your SCSI controller supports more than seven
devices, then you can use SCSI IDs 15 through 8. If you are not sure
if your SCSI controller supports more than seven devices, refer to
the documentation that came with your SCSI controller for

If you have an IBM PS/2 computer, you can view your SCSI ID settings
by accessing the system programs. From the main menu, select Set
configuration. The select Set and view SCSI configuration.
Other computers might have utility programs that enable you to view
the SCSI configuration, or you might have to physically inspect the
installed SCSI devices to see how the IDs are set. For more
information, refer to the documentation that came with your computer
or SCSI controller.

Handling precautions
1 Turn off all attached devices first; then turn off the computer.

 2 Unplug all the power cords from electrical outlets before starting

 3 Disconnect all power cables from your computer and attached devices
   before starting installation.

 4 Limit your movement. Movement can cause static electricity to build
   up around you.

5 Handle the drive carefully and by the edges.

6 Do not touch any exposed printed circuitry.

7 Prevent other people from touching the components or the drive.

 8 When you are installing the drive, touch the static-protective
   package containing the drive to a metal expansion-slot screw or
   other unpainted metal surface on the computer, for at least 2
   seconds. (This drains static electricity from the package and your

 9 When possible, remove the drive and install it directly into the
   computer without setting it down. If this is not possible, place
   the drive, component side up, on the static-protective bag on a
   flat surface until the drive is installed.

10 Do not place the drive on the computer cover or on a metal table.

Installing the drive
These instructions guide you as you install the drive inside your
computer or storage enclosure.

Step 1. Setting the jumpers and terminators

 Note: Be sure you have chosen the SCSI ID before continuing. If you
       did not yet choose the SCSI ID, go to "SCSI IDs" above, then
       return here. Follow these steps to set the SCSI ID to match
       your chosen SCSI ID.

 1 Touch the static-protective bag containing the drive to a metal
   expansionslot cover on the computer. This drains any static
   electricity from the package and your body.

 2 Remove the drive from the static-protective bag, holding the drive
   by the edges. Do not touch any exposed components on the drive.

3 Place the drive on the bag, on a flat surface.

 4 When the Auto Start feature is enabled, the hard disk drive motor
   starts as soon as the computer is turned on. Locate the Auto Start
   jumper by referring to the documentation that came with your drive.
   If the Auto Start jumper is not in place, the hard disk is started
   by a command from the SCSI controller. For drives installed in
   IBM computers or storage enclosures ensure that this jumper is off.
   The hard disk drive is started in a staggered sequence. This
   reduces the start-up load on the power supply. For non-IBM
   computer, refer to the documentation that came with your
   computer for further information.

 5 Set the SCSI ID that you selected. To remove a jumper, pull it
   straight off. To install a jumper, line up the two holes in the
   jumper with the appropriate two pins on the drive. Then push the
   jumper onto the pins until it is completely seated and covers
   both pins.

 6 Store any jumpers you do not use in a safe place, in case you need
   to change the SCSI ID for this drive later. WARNING: If you have
   extra jumpers, do not store them on any of the extra pins on the
   connector. Storing them on a set of pins could damage the drive.

Step 2. Connecting the terminator
The location of the drive you are installing inside the computer or
storage enclosure determines whether you need to connect a terminator
or put a jumper on the Enable Active Termination pins. Read the
information in the following table to determine if you must install
the terminator. For more information about termination, refer to the
documentation that came with your computer.

Note: A SCSI chain of devices consists of multiple SCSI devices
connected by a SCSI cable to a SCSI controller.

If the hard disk drive is: Then:
The last physical device on a SCSI chain of Install the terminator
devices inside the computer.

The last physical device on a SCSI chain of Install the terminator
devices inside an external storage enclosure.

Step 3. Enabling term power
If your drive has a jumper for term power and your SCSI controller is
suppling term power, (check with the manufacturer of your controller)
then you do not need to enable the term power. The jumper should be
off. For help in locating the term power jumper, refer to the
documentation that came with your drive.

Step 4. Installing the drive
For the specific information on installing a hard disk drive, refer
to the documentation that came with your computer. You will be
required to mount the drive inside your computer, and connect signal
and power cables to the hard drive. When installed in an enclosure,
the drive is attached by cable to the external connector of a SCSI
controller. The controller can be either on a SCSI adapter or built
into the system board inside of your computer.

Note: Be sure to use the correct screws provided with your drive.
Using the wrong ones might cause damage to the drive.

Step 5. Completing the installation procedure
The installation of the drive is complete. Reinstall the cover on the
computer or storage enclosure. Store these instructions and any extra
parts in a safe place in case you change your configuration.

After installing your hard disk drive, use the information that came
with your computer to reconfigure your system. When you power on your
system, turn on all attached devices first; then turn on the

If you have any problems at this point, turn off all attached
devices; then, turn off the computer and check that:

1 The cables are installed correctly

2 No options or cables are loose

3 The SCSI ID is properly set

4 No two SCSI drives have the same SCSI ID

5 The terminators are properly installed

Turn on all attached devices; then, turn on the computer. If you
still have a problem, refer to the troubleshooting information in the
documentation that came with your computer.

Step 6. Update configuration
Whenever you add or remove an option from your computer, you must
update the configuration information. Your computer might have an
automatic configuration program, or you might have to follow a
specific procedure. For more information, refer to the documentation
that came with your computer.

Step 7. Preparing the drive for use
Having successfully installed the hard disk drive, you need to
prepare it for use. Depending on the operating system you are using,
you might need to partition then format the hard disk. Refer to the
documentation that came with your operating system for information on
how to format your new drive. To make the drive just installed your
primary drive, you might need to create a new system partition on the
drive. For information on creating a new system partition, refer to
the documentation that came with your operating system.

You might be able to solve a problem yourself. Before calling IBM,
you might want to try some or all of the following troubleshooting

1 Remove and reattach all drive cables

2 Remove and reseat the drive

3 Place the drive in a different slot, if one is available

 4 If your drive contains jumpers or switches, check that they are set
   as specified

 5 Reread any software instructions; be sure software settings are

6 Inspect the drive for damage, such as bent pins

 7 Check the computer manual for instructions about the installation
   of upgrades. Look for a section about system setup or system
   configuration. Follow all procedures.

 8 After completing these steps, reassemble the computer and connect
   the power cord.

If you are still having problems and want to call IBM technical
support, have available as much of the following information as

1 Drive model or P/N and description

2 Computer manufacturer and model

3 Exact wording of error message (if any)

4 Description of the problem

 5 Hardware and software configuration information for your system
   If possible, be at your computer. Your technical support rep might
   want to walk you through the problem during the call.

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