ZiLOG System 8000 - Page 277

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HRM

Z1log

HRM

If

the

initial

disk

format

succeeds,

SMDFMT

will

do

track-by-track

surface

analysis

on

the

disk

to

discover

those

sectors

with

media

errors.

The

first

step

in

the

analysis

makes

certain

that

the

sector

headers

are

readable.

The

sector

IDs

of

all

sectors

on

the

track

are

read

and

compared

with

the

data

that

should

be

in

each

field.

This

read-and-compare

test

repeats

the

number

of

times

given

by

Parameter

2.

The

second

step

makes

certain

that

the

data

fields

of

the

sectors

are

good.

For

this

test,

six

patterns

are

used:

'AAAA',

'5555',

'FFFF'

'6DB',

'DB6',

and

'B6D'.

Each

pattern

is

written

to

the

track,

then

read

a

number

of

times.

Parameter

2

determines

the

number

of

reads

per

pattern.

Any

error

during

track

writes

and

reads

cause

SMDFMT

to

do

writes

and

reads

to

each

individual

sector

on

the

track.

During

surface

analysis,

SMDFMT

keeps

track

of

all

sec-

tors

with

hard

and

soft

errors.

After

surface

analysis,

SMDFMT

reformats

the

disk,

flagging

the

bad

sectors.

During

the

reformat

step,

each

track

has

one

sector

flagged

as

either

bad

or

spare,

with

all

other

sectors

being

active.

If

there

is

an

uncorrectable

(hard)

error

in

the

header

or

data

portion

of

a

single

sector

on

the

track,

that

sector

is

flagged

as

bad

and

all

others

are

active.

If

there

are

correctable

(soft)

errors

on

one

.or

more

sectors

on

the

track,

and

no

sec-

tors

with

hard

errors,

one

of

the

sectors

with

a

soft

defect

is

flagged

as

bad

and

all

others

are

active.

If

there

are

no

defects

on

any

sectors.

on

a

track,

all

sectors

are

active

except

the

last,

which

is

flagged

as

a

spa;re.

If

a

track

has

more

than

one

sector

with

hard

error(s)

1

the

track,

and

in

fact

the

entire

disk,

is

unusable.

A

message

will

appear

at

the

conclusion

of

SMDFMT

if

this

happens.

After

the

disk

is

reformatted,

SMDFMT

will

display

a

lap

summary

table.

The

entire

format

sequence

will

repeat

n

times,

wher~

n

is

the

value

in

the

HREPS

field

on

the

SADIE

test

line.

If

HREPS

=

0,

SMDFMT

will

repeat

the

format

sequence

until

the

user

aborts

the

diagnostic.

A-46

Zilog

A-46

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