Features

• Thermal compensation
• Integrated controller
• Logical block addressing
• Implied seeks
• SCSI disconnect and reconnect capability
• SCSI bus parity
• Closed-loop actuator servo (dedicated disk servo surface plus data reference)
• Automatic actuator lock
• Dedicated head landing zone
• Buffer memory parity
• Self-diagnostic on power up
• Automatic retry and data correction on read errors
• In-line alternate sector assignment
• Reassignment of new defective sectors without the need to reformat
• Probability of not recovering data: 1 in to the power of 12 bits read

Performance

Data transfer rate
  Buffer to/from media          2 MB/S (instantaneous)
  Host to buffer                up to 5 MB/S (synchronous)
  Host from buffer              up to 5MB/S (synchronous)
Rotational speed                4316 RPM
Average latency                 6.95 mS
Sector time                     289.5 uS
Seek Time
  Single cylinder               1.0 mS (read)
                                3.0 mS (write)
  Typical                       11.0 mS (read)
                                13.0 mS (write)
  Average (weighted)            11.5 mS (4 reads / 1 write)
  Full stroke                   20.0 mS

DC power requirement limits

Power supplied to the drive must conform to the following limits:

+12 volt supply
   + or -5.0% (during run)
   - 7.0% +5.0% (during start)


+5 volt supply
   + or -5.0%

+5V DC idle current
Nominal Maximum 0.70 amps 0.90 amps

+12VDC idle/seek current
The current drawn (in amps) from the 12 volt supply is defined for seeking and steady state operations as follows:

                 Nominal        Maximum
Idle
average          0.70           0.90
peak ripple                     1.60
peak to peak                    1.10

Seek
average          1.20           1.40
peak ripple                     2.7
peak to peak                    2.25

+12VDC start/stop current
Nominal Maximum start
(0-0.26 sec) 3.90 amps 4.60 amps
(0.26-1.5 sec) 2.90 amps 3.30 amps

Power supply ripple
Voltage Maximum Notes +5 VDC 100 mV peak-to-peak 0-10 MHz +12 VDC 150 mV peak-to-peak 0-10 MHz

Maximum common mode noise
300 mV peak-to-peak (0 to 100 MHz)

Note: Common mode noise is defined as the differential voltage between frame ground and electrical ground.

Operating environment

The drive operates within its' performance limits when the following environment is maintained. Product life calculations are based on the nominal environment for a typical application.

Humidity:

Operating            8% to 80% noncondensing
Storage              5% to 80% noncondensing
Shipping             5% to 100% (applies at a
                     packaged level)

Wet bulb temperature:

Operating            80 degrees F (26.7 degrees C) maximum
Shipping/storage     85 degrees F (29.4 degrees C) maximum

Elevation:

Operating            -1000 to 10000 feet
                     (-304 to 3048 meters)
Shipping/storage     -1000 to 30000 feet
                     (-304 to 9144 meters)

Temperature:

Operating ambient    50 to 122 degrees F (10 to 50 degrees C)
Operating casting    50 to 140 degrees F (10 to 60 degrees C)
temperature
Operating casting    not to exceed 3.6 degrees F (2 degrees C)
temperature delta    (see note below)
Shipping             -40 to 140 degrees F (-40 to 60 degrees C)
Storage              34 to 140 degrees F (1.1 to 60 degrees C)

Note: Measured between top and bottom of disk enclosure.

Vibration and shock

Operating vibration
Due to the complexity of this subject we recommend that users contact the distributor to discuss how to perform the required measurements if they believe this to be an area which requires evaluation.

Nonoperating vibration
No damage occurs when vibration at the unpackaged drive does not exceed 0.5 G at swept sinusoidal frequencies from 2 to 200 Hz.

Operating shock
The drive continues to operate, at the stated through-put, when subjected to a 5 G half sine wave shock pulse of 11 milliseconds duration.

No permanent damage occurs to the drive when subjected to a 10 G half sine wave shock pulse of 11 milliseconds duration.

The shock pulses are applied in either direction in each of three mutually perpendicular axes, one axis at a time.

Nonoperating shock
No damage occurs as long as the unpackaged drive is not subjected to a square wave shock greater than a value of 35 Gs applied in all directions of the three axes for a period of 20 milliseconds, one direction at a time. (front,left side, right side, back).

Start and stop times

Time              Nominal              Maximum

Start             27 sec               1 min
Stop              9 sec                12.5 sec

During the start sequence diagnostics are performed and are divided into two sections. Pre motor-start diagnostics test the static RAM (control store memory), post motor-start diagnostics test the data buffer, upload the code, perform channel testing and "Reassign in Progress" operations. For more information on diagnostics see the 0661 SCSI Specification.

If a reset is issued before the drive is ready, the power-on sequence starts again. Otherwise, when a reset is issued the present state of the motor is not altered.

A timeout of one minute or more is recommended for the start unit command. This allows the system to take advantage of the extended ERP that the drive does in order to successfully start up.

Note: It is the integrators' responsibility to ensure that equipment into which this drive is fitted meets the relevant regulatory requirements (EMC, etc).