MILPER’s MRDC-20035HA is a rugged, high capacity disk drive designed for use as plug-in unit into MILPER’s MRC family of Rugged Computers, or in any enclosure for standard 5¼“ Device, customer’s enclosure or any other removable mass storage application. The MRDC-20035HA stores up to 20 Gigabytes of formatted data. The unit has an average random seek of 12 msec.

Ruggedized for operation in severe environments - where extreme temperatures, shock, vibration, humidity and air pressure are common - the MRDC-20035HA is field proven in “on-the-move” operation in tracked and wheeled vehicles, as well as airborne application. Since warm up time is very short near instant readiness is provided at all operating temperatures. The sealed, housing encompasses the entire drive mechanism, including electronics, isolating the drive from shock and vibration and protecting it from high humidity and changes in altitude. An embedded digital servo system automatically compensates for temperature variation, ensuring accurate, reliable head positioning over the entire operating temperatures range.
To prevent damage during handling and transport, the heads are automatically parked and secured by a locking mechanism when power is removed.

CAPACITY
Formatted 20,039GB
Average Sectors per track 63
Cylinders 16,383
Bytes per Sector 512
Read Write Heads 2
Discs 1

Seek Time
Track-to-Track 0.8 msec.
Average Random 12 msec.
Maximum 24 msec.

Rotational Latency
Average 7.14 msec
Normal Maximum 11.1 msec
Spindle speed 4200

Data Transfer Speed
Internal Transfer Rate 155 ~ 286 Mbits/sec.
Host Transfer Rate 100 Mbytes/sec.

DIMENSIONS
Cartridge
Height 4.45”
Width 1.50”
Length 6.00”

Cradle
Height 5.75”
Width 1.625”
Length 7.25”

Power
Input Power +5 VDC +12 VDC
Consumption 3.3 W Average. 12 W @ startup

Temperature
Operating: -18 +55 oC
Intermittent: -20 +70 oC
Non Operating: -54 +85 oC
Note: Up to 5 Minutes worm up time is required at –20 °C

Humidity
Operating/Storage MIL-STD-810C Method 507.1 Proc. I, 100%RH (non condensation)

Vibrations
Operating MIL-STD-810F, Method 514.5 Cat. 8 (Propeller A/C)

SHOCK
Operating 30g, 11 msec half sine
Non Operating 120g, 11 msec half sine

EXPLOSIVE
MIL-STD-810F Method 511.4

EMI/RFI
MIL-STD-461D

ALTITUDE
Operating 45,000 feet
Non Operating 65,000 feet