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1. GENERAL DESCRIPTION
1.1 GENERAL
1.1.1
General
The M2301 B/M2302B micro-disk drives are high performance disk drives with un-
formatted storage capacity of 11.7MB and 23.4MB respectively.
The unit consists of contact start-stop type heads and media, a unique head position-
ing band actuator, air filter, and a DC motor and other parts to drive the disks.
All these are contained within a sealed cover. And outside the cover there is a
printed circuit board with the following function; read-write, driver receiver and
sequence logic. In addition there is an external head pre-amplifier board.
The unit is remarkably compact, highly reliable and inexpensive. It was designed to
be the same size as on 8 inch floppy disk drive. The unit can also be connected in
daisy chain configuration of up to 4 units. Its data format is of a fixed length and
together with its easy-to-handle interface, has simplified system design.
1.1.2
Features
(1)
Compact
Since the disks are 200mm in outer diameter and are driven by a DC motor
directly connected to the spindle, the device is extremely compact in size.
The unit measures 217mm (8.5 in) in width, 111 mm (4.4 in) in height and
356mm (14.0 in) in length.
(2)
Economical
The positioning mechanism of the drive is a stepping motor which uses a steel
band and a viscous damper. This has made the unit less expensive.
(3)
High Reliability
The heads, disks, and the positioner are within the disk enclosure and are pro-
tected by a plastic cover. In the disk enclosure, there is a breathing filter and a
recirculation filter to keep the air clean, thus ensuring reliability.
(4)
Preventive maintenance is unnecessary.
(5)
DC Power
Because a built-in DC motor is used, the unit does not have to be modified to
suit line frequencies (50Hz/60Hz) or input power voltages (110, 115, 220,
240V).
(6)
Physical Size
The unit is the same size as an 8 inch floppy disk. Therefore, when replacing a
floppy disk, the locker need not be changed.
(7)
Mounting Plane
The unit can be installed in its locker either vertically or horizontally.
This allows easier installation and flexible system design.
(8)
Loss Power Consumption
Very low power demand (seeking 60W, non seek 50W) permits it to be used in
a wide range of environmental temperature (5°C to 45°C) without a cooling
fan.
(9)
Audible Noise
The unit's low noise output, approx. 55dB (A-scale weighting) even during
seeking makes it ideal for office use.
B03P-4605-0003A .... B
1-1
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