MPI 40 Series - Functional Description; Specification Summary

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1.5 FUNCTIONAL DESCRIPTION

The Model 40

Series

is

self-contained

and

requires

no

operator

inter-

vention

during

operation.

The

drive

consists

of

a

media-rotating

system,

a

head-load

and

positioning

system,

and a

write/erase

and

read

system.

The

MPI

Model 40

Series

storage

drives

read

and

write

in

single

or

double

density

on

standard

diskettes.

The

MPI

Model 41

provides

storage

on

one

side

of

standard

diskette

or

on

both

sides

if

the

"flippy"

option

is

requested

by

the

customer.

The

MPI

Model 42

provides

for

information

storage

on

both

sides

of

standard

two-sided

diskettes.

The

only

difference

between

these

two

units

is

the

number

of

heads

in

the

disk

drive

and

storage

capacity.

The

logic

PCB

is

identical

in

all

models.

When

the

front

door

is

opened,

access

is

provided

for

the

insertion

of

a

diskette.

The

diskette

is

accurately

positioned

by

chassis

guides,

the

front

latch

inhibitor,

and

by

the

backstop.

Closing

the

front

door

activates

the

cone/clutch

system,

resulting

in

centering

of

the

diskette

and

clamping

it

to

the

spindle

hub.

The

spindle

hub

is

driven

at

a

constant

speed

of

360

RPM

by a

servo-controlled

DC

motor.

When

the

drive

is

in

operation,

it

is

important

that

the

head-to-media

rela-

tionship

be

controlled.

This

is

accomplished

by

the

head-load

system

in

the

following

way:

When

the

door

is

closed

the

media

is

pressed

against

the

lower

head;

the

Index

sensor

is

referenced

to

the

head

and

the

spindle

hub;

and

the

upper

head

in

the

Model 42

drive,

or

the

felt

pad

in

the

Model

41

drive,

is

loaded

against

the

media

on

the

opposite

side

of

the

head

with

a

force

of

approximately

20

grams.

The

recording

head(s)

is

positioned

over

the

correct

track

by means

of

a

four-phase

stepper

motor/band

mechanism, and

its

associated

electronics.

A

one-step

movement

causes

a

one-track

movement.

With

band

positioning,

very

high

step

rates

can

be

accomplished

with

the

Model 40

Series

system.

1.6 SPECIFICATION SUMMARY

This

section

provides

mechanical

and

electrical

specifications

and

information

relevant

in

understanding

the

characteristics

of

the

MPI

Model

40

Series

Flexible

Disk

Drive.

The Model 40

Series

specifications

have

been

catagorized

under

the

following

headings:

A.

Performance

B.

Function

c.

Physical

D.

Reliability

1-4

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