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Hard Drive: LAPINE: TITAN LT200 20MB 3.5"/HH MFM ST412

T I T A N   L T 2 0 0    LAPINE
NO MORE PRODUCED                                      Native|  Translation
Form                 3.5"/HH               Cylinders     612|     |     |
Capacity form/unform    20/   25 MB        Heads           4|     |     |
Seek time   / track  65.0/15.0 ms          Sector/track   17|     |     |
Controller           MFM / ST412           Precompensation     1
Cache/Buffer               KB              Landing Zone
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 90    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle          11.5 W     Shock        g        10       |     60
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA        40
       spin-up            W     ECC        Bit
                                MTBF         h      28000
                                Warranty Month
Lift/Lock/Park     YES          Certificates                                  



  |                                                         |XXX Power
  |                                                         |XXX P3
  |                                                         |XX
  |                                                         |XX P2
  |                                                         |XX
  |                                                         |
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX P1
  |                                                         |XX
  |                                                  S4+-+  |XX
  |                                                   || |  |XX
  |                                                  S1+-+  |XX
  |                                                         |XX
  |                                                         |

    |      P1                   P2           |
    |                         |XXXXXXXXX|P3  |
    |                         +Power----+    |
    |                                        |
    |                                        |
    |                                        |
    |                                        |



Jumper Setting

Address Assignments
An individual drive may have an address of 0, 1, 2, or 3. The address
is determined by the connection of the drive select jumpers. These
jumpers are located (near the microprocessor) on the PCB of the
drive. Jumper installed at S1, S2, S3, or S4 selects drive address
0, 1, 2 or 3, respectively.

   |Drive|S1    |S2    |S3    |S4    |
   |  1  |CLOSED|OPEN  |OPEN  |OPEN  |
   |  2  |OPEN  |CLOSED|OPEN  |OPEN  |
   |  3  |OPEN  |OPEN  |CLOSED|OPEN  |
   |  4  |OPEN  |OPEN  |OPEN  |CLOSED|



Notes on Installation

The TITAN LT200 may be mounted in any position. Eight mounting holes
are provided in the drive chassis. These holes accept 6-32 machine
screws. Please note that up to four drives may be mounted in a
standard 3.25" x 5.75" x 8.0" space in a host system.

Power dissipation for the drive is 11.5 watts (average). Cooling,
whether by air or by fan, must sufficient to keep both the drive and
the host system within their required temperature limits.

Cable Connections
After the drive has been mounted, connect the cables. Use only the
recommended cables. For the control cable and data interface, we
recommended the twisted pair or flat ribbon cables. These cables
should not be longer than 20 feet. Similarily, the power cable should
have twisted pairs for each line voltage and return.

Multiple Drive Interconnect
When more than one drive is installed into a host system, the cabling
between the controller/data separator of the host system and the
drive should be arranged as shown in the following figure.

                 Cabling for multiple drives

   +-----------+                                +-----------------+
   |           +---o---Control------------------+J1     Drive 1   |
   |           |   |    +-------Data------------+J2               |
   |           |   |    |             +-Power---+J3               |
   |           |   |    |             |         +-----------------+
   |           |   |    |             |         +-----------------+
   |Controller |   o----+-------------+---------+J1     Drive 2   |
   |           |   |    | +-----------+---------+J2               |
   |           |   |    | |           o---------+J3               |
   |           |   |    | |           |         +-----------------+
   |           |   |    | |           |         +-----------------+
   +-----------+   o----+-+-----------+---------+J1     Drive 3   |
   |           |   |    | | +---------+---------+J2               |
   |           +---+----+ | |         o---------+J3               |
   |           +---+------+ |         |         +-----------------+
   |Data       +---+--------+         |         +-----------------+
   |Separator  |   +------------------+---------+J1     Drive 4   |
   |           +----------------------+---------+J2               |
   |           |                      o---------+J3               |
   +-----------+                      |         +-----------------+
                       DC voltages----+

Three types of connectors are required for the LT200 electrical
interface. Use the following types or their equivalents:

  Name                     Part Number
  P1: Control Interface    AMP 88373-3
  P2: Data Interface       AMP 88373-6
  P3: Power Supply         AMP 1-480424-0 (Housing)
                           AMP 350078-4 (Pins)

These P1, P2, and P3 connectors (on the TITAN's PCB) mate with the
edge connectors (J1 and J2) and power connector (J3), respectively.

Data Interface
Connectors J1 and J2 are assigned for the data interface; J1 has 34
pins and J2 has 20 pins. The even pin numbers are shown on the
component side of the PCB. The odd pin numbers are printed on the
solder side of the PCB. Both have their key slot between 4 and 6.

Drive Control and Power Interface
All drive outputs are driven by tri-state drivers. All drive control
output signals are unbalanced true when low, and are in the high-
impedance state when the drive is not selected.

Observe the following restrictions when applying power to the TITAN

 - If the 5-volt power is applied first, the 12-volt power must follow
   within 100 msec.

 - Both the 5-volt and 12-volt supplies must be able to maintain the
   necessary voltage and ripple specifications with 12 ohm resistive
   loads. During the first four seconds, the 12-volt supply must
   maintain these specifications with a 4.8 ohm resistive load.

 - During operation, the rate of voltage change for the 12-volt supply
   must not exceed the specified tolerance.

 - During operation, the dc power must never be broken. Only the ac
   can be used for power down. Do not disconnect the dc plug (P3) with
   power applied. If dc power is interrupted during operation, repeat
   power up instructions and power down using ac shut off.



General Description
The LT200 Winchester disk drive may be used as a storage device for
any computer system with the industry standard ST412 or ST506 inter-
face. This product is ideal for ruggedized applicatons and specially
suited where compact size, light weight, high storage capacity, and
reliability is required.

The LT200 is a rugged, light weight 3.5-inch Winchester disk drive.
It has a storage capacity of 20 megabytes formatted with 16 spare
tracks. It has a four-point internal suspension systm and head lifter
which allows it to withstand shocks up to 60 g's when power is off.
It far exceeds the industry standard. With external shock absorbers,
this figure can be significantly improved. Head/media slap in transit
is protected by a proprietary head lifter, which automatically lifts
the heads from the media and locks them in a secure position when
power goes down. When the power is applied, it sets the disks in
motion and the head lifter loads the heads back to the surface of the
media where they fly just above the media surface. This feature
eliminates head/media wear during start ups and power downs, as well
as prevents the potential for stiction.

The LT200 uses a rotary band positioner driven by a bipolar stepper
motor. This operates under the control of a microprocessor and it
positions the read/write heads. The head positioning system is
designed in such a way that the two thermal loops of the positioning
system is designed in such a way that the two thermal loops of the
positioning system oppose one another. This results in an extremely
accurate head positioning over the entire operating temperature

A ferrofluidic seal is installed to eliminate contamination from the
motor bearings. The recirculating filter at the periphery of the
disks efficiently cleans the HDA air by trapping entrained particles.

The electronics of the LT200 are mounted on a single four-layer
circuit board beneath the HDA and inside the shock-mounted frame.
On-board diagnostics monitor the power supply, host controller, and
drive functions. Up to four TITAN LT200 drives can be linked to a
single controller on a common power and control bus.

Head Lifter Mechanism
The LT200 uses the proprietary head lifter mechanism that is unique
in the Winchester disk drive technology. This mechanism prevents the
heads from ever touching the disk surface thus making it shock
resistant while eleiminating stiction and head/media wear. The head
lifter mechanism consists of four sturdy metal rods, a spring, and
head lifter circuitry. When the power is interrupted, the heads are
automatically lifted from the disk surface.

Precompensation is recommended on every track from 0 to 615. The
optimum amount of precompensation is 12 nanoseconds for both early
and late bits.

Mapped Defects
Each drive shipped from the factory will have a list of disk defects
attached to the HDA cover. The list will indicate the number and
location of hard errors. These defects must be excluded from any data
or format use in order to meet specified error rates.

The total number of maximum allowable defects are as follows:

a. 30 per drive
b. 10 per disk surface.

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