MPI 40 Series - Purpose of Equipment; Physical Description

Figure 1-3: 41S/42S Disk Drive
1.3 PURPOSE OF EQUIPMENT
The Model 40 Series Disk Drives are high-speed, random access devices
which store data on and retrieve data from an oxide-coated mylar diskette that
is 8 inches (20.32 cm) in diameter. It provides a highly reliable and compact
solution to problems of low-cost data storage.
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Typically, floppy disk drives are used with intelligent terminal controllers,
microcomputers, word processing systems, data communications systems, error
logging, microprogram loading, and point-of-sale terminals. The Model 40
Series is designed to meet and perform to ANSI specification, utilizing
standard 8 inch diskettes.
1.4 PHYSICAL DESCRIPTION
The Model 40 Series can be mounted vertically or horizonally. How-
ever, when mounted horizonally, it is recommended that the drive be positioned
with its top side up (refer to figure 4-1). The mechanical components consist
of an aluminum chassis, on which is mounted a spindle (belt-driven by a DC
motor); a stepper motor/band combination for positioning the magnetic head
assembly; and a cone/clutch assembly for centering and holding the recording
media under operation. Access for diskette loading is at the front of the
drive.
The recording-head assembly is of a glass bonded ferrite/ceramic structure,
with lifetime expectancy in excess of 20,000 hours. The electronic circuitry
is mounted on two circuit cards. The spindle speed PCBA controls the drive
spindle, and the control electronics PCBA controls all other functions of the
drive. Power and interface signals plug directly into the control electronics
PCBA.
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