Models: DFMS-Sxx

Features

• Magneto resistive heads
• User configurable block sizes
• Closed loop actuator servo (embedded sector servo)
• PRML data channel with digital filter
• Spindle synchronization
• Drive supported SCSI bus termination power
• Enhanced ECC on the fly
• Predictive failure analysis

Configuration 

• Interface SCSI-2/SCSI-3/SCA
• Formatted device capacity 1.32/2.32/2.65/4.32/5.31 GB
• Sector size 256-744 Bytes (even # of bytes only)
• Data heads 4/7/8/13/16
• Disks 2/4/4/7/8
• Areal density (max) 501.8-578.1 Mb/sq.in.
• Recording density (max) 132,817
• BPI Track density 4352 TPI

Performance

• Rotational speed 5400 RPM
• Media transfer rate (avg) 10.87 MB/sec (instantaneous)
• Interface transfer rate (max) 20.0 MB/sec (synchronous, sustained)
• Interface transfer rate (max) 10.0 MB/sec (asynchronous)
• Latency average 5.55 ms
• Seek time (typical) Average (read) 7.8-8.4 msec Track to track 0.6 ms Full track 16.5 ms
• Spin up 8.2-10 sec

Power

• Requirements +5 VDC +/-5% ²
• Power supply ripple (0-20 Mhz max) 100 mV p-p ³ Dissipation (typical)
• Idle average 6.7/7.8/7.8/9.2/9.6 Watts
• Seek average 9.4/10.6/10.6/11.9/12.4 Watts
• Start up .3/1.8 Amps ⁴ Supply rise time

Physical size

• Height 25.4 mm / 41.3 mm ⁵
• Width 101.6 mm
• Depth 146.0 mm
• Weight 0.5 kg / 0.8 kg ⁶

Environmental characteristics Altitude

• Operating -304 to 3048 m
• Ship / store -304 to 12192 m
• Temperature⁷ Operating 5 to 55 C Storage 0 to 65 C Shipping -40 to 65 C
• Temperature gradient 20 C / hour (max) (Operating, storage or shipping)

Operating

• Ambient temperature 5 to 55 C
• Relative humidity (non-condensing) 5% to 90%
• Maximum wet bulb (non-condensing) 26.7 degrees C
• Shock ⁸ (half-sine wave) 10 G / 2 msec
• Vibration 1.0 G

Non-Operating

• Ambient temperature -40 to 70 C
• Relative humidity (non-condensing) 5% to 95%
• Maximum wet bulb (non-condensing) 29.4 degrees C
• Shock ⁹ (half-sine wave) 150 G / 2 msec
• Vibration 2 G

Notes:

1. 1 MB = 1000000 bytes
2. The drive shall not incur damage for an over voltage condition of +25% (maximum duration of 20ms) on the 5 V nominal supply.
3. The maximum supply ripple is measured at the 5 V input on the drive.
4. .3 Amps for 1x, 2x and 3x. 1.8 Amps for 4x and 5x.
5. 25.4 mm for 1x, 2x and 3x. 41.3 mm for 4x and 5x.
6. 0.5 kg for 1x, 2x and 3x. 0.8 kg for 4x and 5x.
7. The system is responsible for providing sufficient air movement to keep the surface temperature, measured at the center of the drive's top cover, below 60 C.
8. The drive will withstand, with no hard error, a 100 G half-sine wave shock pulse for a 2 ms duration.
9. The drive will withstand, with no permanent damage or degradation in performance, a 120 G half-sine wave shock pulse of 11 ms duration or 300 G for 2 ms.

Vibration and shock

Operating/non-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.

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 milliseconds 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 milliseconds, one direction at a time.

Additionally, no damage will occur if the unpackaged drive is not subjected to an 11 millisecond half sine wave shock greater than 60 Gs applied to all three axis, one direction at a time.