Features

• Industry-standard interface: ANSI/SCSI-2
• Integrated controller
• Logical block addressing
• Implied seeks
• SCSI disconnect and reconnect capability
• SCSI bus parity
• High performance (H12 & H11) and low power (L12 & L11) models available
• (0,4/4) 8/9 rate encoding
• Read-ahead caching
• Multi-segmented data buffer
• Scatter/gather function support
• Tagged and untagged command queuing (selectable)
• Automatic sector reallocation (selectable)
• Error logging
• Down-loadable SCSI firmware
• Automatic retry and data correction in read errors
• In-line alternative sector assignment for high performance
• Sector reassignment without reformat
• Predictive failure analysis

Data transfer rate
   Buffer to/                 3 MB/S (instantaneous)
   from media
   Host to buffer             up to 5 MB/S (synchronous)
   Host from buffer           up to 5 MB/S (synchronous)
Rotational Speed              4316 RPM
Average latency               6.95 mS
Seek time
                              Read        Write
   Single cylinder            0.6 mS      2.5 mS
   (all models)
   Average      (L11, L12)    10.6 mS     12.6 mS
   (weighted)   (H11, H12)    9.4 mS      11.4 mS
   Full stroke  (L11, L12)    20.0 mS     22.0 mS
                (H11, H12)    18.5 mS     20.5 mS

DC power requirement limits

The following voltage specifications apply at the file voltage connector, there are no special power on/off sequencing requirements.

+12 Volt Supply
   +/- 5.0% (during run)
   -7.0% +5.0% (during start)
+5 Volt Supply
   +/- 5.0%

Power supply current (Amps) - Population mean
                             +5 Volt    +12 Volt
Idle average                  1.07        0.49
Seek peak (H11, H12)                      1.84 (see note 1)
          (L11, L12)                      0.78
Spin-up   (H11, H12)                      3.75 (see note 2)
          (L11, L12)                      3.59
Commutation                               0.35

Note 1: The idle average, communication and seek peak should be added together to determine the total 12 volt peak current.

Note 2: The current at start is the total 12 volt current required (ie the motor start current, module current and voice coil retract current.

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 90% noncondensing
Storage                       5% to 95% 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 10,000 feet
                              (-304 to 3048 meters)
Shipping/storage              -1000 to 40,000 feet
                              (-304 to 12,192 meters)

Temperature:
Operating ambient             41 to 131 degrees F (5 to 55 degrees C)
Operating casting             41 to 131 degrees F (5 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 149 degrees F (-40 to 65 degrees C)
Storage                       34 to 149 degrees F (1.1 to 65 degrees C)

Temperature Gradient
Operating                     18 degrees F (10 degrees C) per hour
Shipping/storage              below condensation

These temperature limits are extremely important and must not be exceeded at the worst case drive and system operating conditions with the drive randomly seeking, reading, and writing.

Note: Measured between top and bottom of disk enclosure. See Figure 3 on back page for location of measurement points.

Externally generated ripple

(as seen at file power connector)

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

During file start up and seeking, 12 volt ripple is generated by the file (referred to as dynamic loading). If several files have their power daisy chained together then the power supply ripple plus other file's dynamic loading must remain within the regulation tolerance window of +/- 5%. A common supply with separate power leads to each file is a mode desirable method of power distribution.

The file's mounting frame is electrically isolated from the file's disk enclosure. The disk enclosure is not at ground potential. Therefore any user mounting scheme must not result in the disk enclosure being shorted to ground.

To prevent external electrical noise from interfering with the file's performance, the file's mounting frame may be electrically isolated from the system mounting frame. If isolation is not practical then the file's mounting frame must be within +/- 150 millivolts of the file's power supply ground. At no time should more than 35 milliamps of current be injected into the file frame. The frequency range that has been tested with this specification is 0 to 100 MHz.

Hot plug/unplug support

If there is a need to plug or unplug the file while the power supply is active than the using system must assure that the ground pin makes contact first. This prevents a possible CMOS latch-up condition. During the hot 'plug-in' event the 5 or 12 volt power supply voltage must not go out of tolerance on the high voltage direction. During the hot 'unplug' event capacitors on the file will prevent inductive flyback voltages from increasing to the point of damage to the file.

If the SCSI bus is connected while it has power active on any of its lines then a power or signal glitch may occur on the bus. If any other devices are sharing the bus then this glitch may cause them to produce an error.

Vibration and shock

Operating/nonoperating 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.

Operating shock

The drive will continue to operate, at the stated "Performance," when subjected to a 5 G half sine wave shock pulse of 11 mS duration.

No permanent damage will occur 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 axis, one axis at a time.

Non-operating shock

No damage will occur if the unpackaged drive is not subjected to a square wave shock greater than a "faired" value of 35 Gs applied to all three axis for a period of 20 mS, one direction at a time.

Start and stop times

Time                          Nominal     Maximum
Power Up                      2.0 sec     2.4 sec
Start Unit                    19.5 sec    1 min
Stop                          9 sec       12.5 sec

During the start sequence diagnostics are performed and are divided into two sections. Power-up 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 0663 Enhanced Disk Drive 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).