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FDD412A/B

5.3.2

Medium

Life

The

medium

is

held

in

contact

with

the

magnetic

heads

during

a

read/

write

operation.

handle

and

store

it

significantly

affects

the

service

life.

Since

the

disk

is

mounted

as

needed,

the

way

to

‘In

addi-

tion,

the

product

quality

varies

from

manufacturer

to

manufacturer.

(1)

What

shortens

service

life

of

media

[|

cacesory

|

1

a

10

li

12

Associated

with

FDD

control

method

Associated

_with

FDD

installa-

tion

design

Associated

with

how

to

set

medium

on

FDD

Table

5.8

Probable

Cause

Shortening

Service

Life

Damaged

Portion

Remarks

head

load/unload

opera-

tions

on

the

same

spot

of

oxide

coating

Continuous

use

in

head

load-on

state

Use

at

ambient

tempera-—

ture

of

50°C

or

more

Medium

inserted

without

FDD

spindle

rotating

Medium

left

inserted

Synchronized

and

repeated

|

Oxide-coating

disk

surface

do

-

Disk

center

hole

:

Jacket

1

|

This

problem

depends

on

the

FDD

control circuit

for

solution.

(Considered

in

circuit

design).

-.do

-

|

Where

the

FDD

is

used

in

an

inadequately

venti-

lated

location,

any

margin

providing

for

temperature

rises

is

exhausted.

The

disk

center

hole

tends

to

be

damaged,

causing

an

off~track

state.

Spindle

revolutions

damage

the

jacket.

halfway

for

a

long

time,

with

spindle

rotating

Door

closed,

with

medium

inserted

halfway

into

FDD

Jacket

and

area

around

disk

center

hole

;

damages

the

area

around

Pressure

on

the

collet

i

the

center

hole

Associated

with

how

to

handle

medium

Fingerprints

on

oxide-

coated

disk

surface

i

ir

re

pc

Oxide-coated

disk

surface

;

oxide

coating.

Chemical

ingredients

at

fingerprints

change

the

Use

of

solvent

(thinner,

alcohol,

Freon,

etc.)

-.do

-

Chemical

change

on

oxide-coating

Use

of

clips

Writing

on

index

with

pencil,

ball-point

pen

or

any

hard

tip

writing

utensil

Jacket

and

disk

Oxide-coating

disk

surface

2

(SP

The

portion

pinched

by

|!a

clip

is

mechanically

;

deformed,

error.

causing

an

Use

of

a

felt-tip

pen

(or

any

soft

tip

writ-

|

ing

utensil)

is

prefer-

Bend

or

breakage

Use

of

erasure

red.

-

do

-

Damages

causes

errors.

~-do

-

Rubber

chips

result

in

—100-

error.