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Hard Drive: TANDON: TM262 21MB 5.25"/HH MFM ST506

T M 2 6 2    TANDON
NO MORE PRODUCED                                      Native|  Translation
Form                 5.25"/HH              Cylinders     615|     |     |
Capacity form/unform    21/   25 MB        Heads           4|     |     |
Seek time   / track  80.0/ 3.0 ms          Sector/track   17|     |     |
Controller           MFM / ST506           Precompensation 65535
Cache/Buffer               KB              Landing Zone      663
Data transfer rate    0.625 MB/S int       Bytes/Sector      512
                      0.625 MB/S ext
Recording method     MFM                            operating  | non-operating
Supply voltage     5/12 V       Temperature *C         4 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |      8 80
       standby            W     Altitude    km    -0.457  2.972| -0.457 12.195
       idle          10.0 W     Shock        g        10       |     40
       seek               W     Rotation   RPM      3568
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   -
                                MTBF         h      15000
                                Warranty Month
Lift/Lock/Park     NO           Certificates     CSA,UL1950                   



  +---------------------------------------------------------+  1
  |                                                         |XX
  |                                                         |XX J1
  |                                                      +1 |XX
  |                                             Terminator| |XX
  |                                             Resistor || |XX
  |                                                      || |XX
  |                                                      ++ |XX
  |                                                  W1+--+ |
  |                                          Drive   W2|  | |XX1
  |                                          Address W3|  | |XX J2
  |                                                  W4|  | |XX
  |                                                  W5|  | |XX
  |                                                    +--+ |XX
  |                                                         |XX
  |                                                         |  1
  |                                                         +---J3XX
  |                                                         +-----XX



Jumper Setting

 Drive Address Jumper
                                            W1 Drive Select 0
   +--------+   +--------+   +--------+     W2 Drive Select 1
   ++++++++++   ++++++++++   ++++++++++     W3 Drive Select 2
          xx W1       xx W2      xx   W3    W4 Drive Select 0
                                 |          W5 Radial Configuration
   +--------+   +--------+      Jumper
   ++++++++++   ++++++++++
      xx    W4   xx      W5
      |          |
     Jumper     Jumper

The drive address option allows the user to daisy chain up to four
drives, and to enable one drive at a time. Drive Select is
implemented by shorting one of the four connections, using the Drive
Select Jumper. The W5 location is used for radial configurations.
The drive is selected at all times with the W5 jumper installed.

If jumper configurations are changed, power should be cycled off and
on, so that the microprocessor can recognize the new configuration.

 Terminator Resistor
                        The terminator resistor pack, located on the
        +--------+      logic circuit board should be installed in the
        |********| ^    last drive of the daisy chain. All other
        +--------+ |    drives on the interface must have the
        ++++++++++      resistor pack removed. For a radial configura-
        +--------1      tion, all drives should have the terminator
                        resistor pack installed.



Notes on Installation

Installation direction

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
      x           x                |  |     |           |     |  |
 +------x------x-------+           |  +-----+           +-----+  |
 +-+------x--x-------+-+           +--+                       +--+
   |       xx        |
   |     x    x      |
     x            x

Mounting the Drive
The drive can be mounted in any vertical or horizontal plane. On the
TM362, eight 6-32 tapped holes are provided for mounting: two on each
side and four on the bottom of the frame. On the TM262 twenty-four
6-32 tapped holes are provided for mounting: eight on each side and
eight on the bottom of the frame. The drive is manufactured with some
critical internal alignments that must be maintained. Hence, it is
important the mounting hardware does not introduce significant stress
on the drive.

Any mounting scheme in which the drive is part of the structural
integrity of the enclosure is not permitted. Mounting schemes should
allow for adjustable brackets or incorporate resilient members to
accommodate tolerances.

A sway space is required between the head disk assembly and other
assemblies in the user system to allow for movement of the housing
on its shock mounts 0.060 inces minimum.

Daisy Chain/Radial Capability
The circuit board provides address selection and gating functions
that allow a user to daisy chain up to four drives or configure the
drive for radial connection. A SIP resistor pack is used to
terminate the interface. The resistor pack is removed from its SIP
socket on all drive except the last one in a daisy chain. When a
single-drive system or a radial configuration is used, the resistor
pack remains plugged into the SIP socket.

Both drives are compatible with controllers that use an ST506/412
industry standard interface.

Front Panel
Front panels equipped with an activity indicator are available for
each of the drives.

Air Filtration
A self-contained, recirculating air filtration system supplies clean
air through a 0.3-micron filter. A secondary breather filter is
provided to allow pressure equalization with the ambient atmosphere
without contamination. The entire head-disk-actuator compartment is
maintained at a slightly positive pressure to further ensure an
ultraclean environment.

Interface Connectors
The electrical interface between the drive and the host system is via
three connectors. J1 provides control signals for the drive. J2
provides for the radial connection of read/write data signals. J3
provides for D.C. power.

J1/P1 Connector
Connection to J1 is through a thirty-four-pin circuit board
connector. The pins are numbered 1 through 34. The even pins are
located on the solder side of the circuit board. A key slot is
provided between Pins 4 and 6. The recommended mating connector for
P1 is AMP ribbon connector P/N 88383-3, without ears.

J2/P2 Connector
Connection to J2 is through a twenty-pin circuit board edge
connector. The pins are numbered 1 through 20. The even pins are
located on the solder side of the circuit board. The recommended
mating connector for P2 is AMP ribbon connector P/N 88373-3, without
ears. A key slot is provided between Pins 4 and 6.

J3/P3 Connector
D.C. power connector J3 is a four-pin AMP Mate-N-Lok connector, P/N
1-480426-0. The recommended mating connector, P3, is AMP P/N
1-480424-0, utilizing AMP pins P/N 60619-4. J3 pins are labeled on
the J3 connector. J3 cabling must be 18 AWG minimum.

Interface Line Descriptions
The interface for the TM362 and TM262 drives is avilable in one
configuration. It is compatible with ST506/412 indutry standard
drives. Compatibility is defined as using the same pin assignment
where the signal and function are common.

The interface may be connected in the radial or daisy chain



This manual provides useful information to assist the customer when
incorporating the Tandon rigid disk drive into a system.

The TM362 and TM262 disk drives are full feature, compact units that
use a pseudo-closed-loop head positioning system in conjunction with
standard Winchester technology to store data on 3.5-inch plated
media. Voltage and signal requirements for both drives are identical
to those of Tandon Corporation's standard 5-1/4-inch family of rigid
disk drives.

Frame size is the only difference between the TM362 drive and the
TM262 drive. The TM362 is designed to fit in a standard 3.5-inch
cavity, and the TM262 is designed to fit in a standard 5-1/4-inch
drive cavity.

The storage media is contained within the drive in a fixed, non-
operator-removable configuration.

Purpose of the Drive
These drives are rotating disk memory devices designed for random
access data storage and retrieval. Typical applications include word
processing systems, entry level microprocessor systems, intelligent
calculators, program storage, small business computer systems, and
any application in which low cost, high speed random access data
storage is required.

Microprocessor Control
The TM362 and TM262 drives feature an onboard microprocessor,
providing five major functions:

 1. Self-calibration on power-up.
 2. Seek timing for the head positioning mechanism.
 3. Write current switching for optimal data recording quality.
 4. Power and track fault detection.
 5. Compensation for positioning errors caused by temperature and
    mechanical variations.

Functional Description
The functional characteristics of the TM362 and TM262 drives are
identical. The drives are fully self-contained and require no
operator intervention during normal operation. During the power-up
sequence, the spindle motor reaches 3,568 RPM, and the positioning
mechanism recalibrates the recording heads back to Track 0. If the
spindle motor does not up to speed within 15 seconds, the drivers to
the spindle motor will be turned off. A new power up sequence will be
attempted when the power is momentarily removed and then restored.

The drives are designed to optimize MFM write and read data recording
methods, as specified by the ST506/412 interface. Data recovery
electronics include a low-level read amplifier, differentiator, a
zero-crossover detector, and digitizing circuits. No data encoding
or decoding features are provided on the drives.

The heads are positioned over the desired track by means of a stepper
motor and a rack and pinion mechanism. Servo positioning pulses are
recorded on the final segment of each Head 0 track, and, by
continuously monitoring the location of the heads in relationship to
those pulses, the drive is able to maintain highly accurate servo

The onboard microprocessor monitors all functions that could affect
drive performance. If a problem exists, the drive will abort its
power sequence or (after achieving a Ready state) declare a fault

A parking zone is provided for the read/write heads at cylinder 663.
The parking function is under the control of the drive controller.

 Seek Time
       |                                  |362/262 |
       |Track-to-Track         msec. typ. |   3    |
       |Average                msec. typ. |  80    |
       |                       msec. max. | 195    |
       |Head Settling Time     msec.      |  15.0  |
       |Latency                msec. avg. |   8.41 |

Power Sequencing
No power sequencing is required. The microprocessor starts the
spindle motor when both voltages are present.

Soft and Hard Read Error Rates, Exclusive of Media Defects
For data that has been verified previously as error free, and when
used in conjunction with a data separator and phase lock loop of good
design, the recoverable (soft) error rate for any subsequent read
operation shall not exceed one error in 1 x 10(10) bits transferred.
A recoverable read error is an error that may be corrected within
five attempts to reread the data.

The nonrecoverable (hard) read error rates shall not exceed one error
in 1 x 10(12) bits transferred. A nonrecoverable read error is an
error that may not be corrected within five attempty to reread data,
providing that the writing of the data previously has been verified
as correct. The seek error rate is not exceed one error in 1 x 10(6)

Media Defects
Any defects on the media surface will be identified on a defect map
provided with each drive. This defect map will indicate the head
number, track number, and the number of bytes from index for each
defect. Each defect shall be no longer than 16 bits. Cylinders 000
and 001 are guranteed error free.

The defect map is offered as a guide only. The number of defects and
their locations can change due to customer system variations, such
as data separators.

A parking track is located at cylinder 663, to reduce the probability
of damage to data tracks during extreme shock conditions.

Mean Time Between Failures 15,000 power on hours
Mean Time To Repair 30 minutes
Component Design Life 5 years
Preventative Maintenance Not Required

Dust Cover
The design of an enclosure should incorporate a means to prevent
contamination from loose items (e.g. dust, lint, and paper chad)
since the drive does not have a dust cover.

Write precompensation
Tandon does not recommended write precompensation.

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