Sharp FDD-412A - Page 8

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FDD412A/B

(7)

Electromagnetic

door

lock/umlock

mechanism

The

controller

is

equipped

with

an

electromagnetic

door

lock/unlock

mechanism

that

prevents

an

inadvertent

opening

of

the

door

during

operation.

pene

Fig.

1.1

Outside

View

of

FDD-412A/B

Floppy

Disk

Drive

2.

PRINCIPLES

OF

OPERATION

2.1

Outline

The

FDD

(floppy

disk

drive)

is

a

device

that

writes

and

reads

data

to

and

from

the

floppy

disk.

As

shown

in

Fig.

2.1,

a

floppy

disk

has

77

concentric

"tracks"

on

either

surface

(i-e.,

154

tracks

on

both

sides).

Data

is

sequentially

recorded

on

each

track.

A

carriage

has.one

magnetic

head

on

each

side

respec-

tively,

and

read/write

data.

It

moves

radially,

processing

data

on

the

tracks.

To

write

or

read

data

to

or

from

a

given

location

on

the

floppy

disk,

the

following

steps

are

required:

(1)

The

magnetic

head

and

recording

medium

are

given

a

relative

velocity.

(2)

The

magnetic

head

is

positioned

over

the

target

track.

(3)

The

target

data

is

searched

from

among

numerious

data

records

written

on

that

track.

:

(4)

The

data

is

read

from

or

written

onto

the

record.