Seagate ST-506 Manuel utilisateur

·ST506

MICROWINCHESTER

OEM

MANUAL

PRELIMINARY

APRIL

1.1

1981

·&agate

Tec1moloyy

Page

4.0

Electrical

Interface

4.1

Control

Input

Lines

4.1.1

Reduced

Write

Current

4.1.2

Write

Gate

4.1.3

Head

Select

and

4.1.4

Direction

4.1.5

Step

4.1.6

Drive

Select

1-4

4.2

Control

Output

Lines

4.2.1

Seek

Complete

4.2.2

Track

4.2.3

write

Fault

4.2.4

Index

4.2.5

Ready

4.3

Data

Transfer

Lines

4.3.1

MFM

write

Data

4.3.2

·MFM

Read

Data

4.3.3

Read/Write

Timing

4.4

Drive

Selected

4.5

CUstomer

Options

4.5.1

Radial

Select

4.5.2

Defeat

Reca1ibrate

4.5.3

Half

Step

.5.0

Physical

Interface

5.1

Jl/Pl

Connector

Control

Signals

27·

5.2

J2/P2

Connector

Data

Signals

6.0

5.3

5.4

Physical

6.1

6.2

6.3

6.4

J3/P3

Connector

Power

J4/p4

Frame

Ground

Connector

Specifications

Mounting

Orientation

Mounting

Holes

Physical

Dimensions

Shipping

Requirements

7.0

Track

Fonnat

7.1

7.2

7.3

7.4

7.5

7.6

Figures:

Gap

Sector

Interleaving

Defective

Sector

Flags

Air

Fil.tration

System

Positioning

Mechanism

Power

Sequence

Control

Signals

Data

Signals

Typical

Connection,

Drive

System

Control

Receiver/Driver

Combination

Step

Mode

T~ing

Index

Timing

Data

Line

Driver/Receiver

Combination

iii

Page

5-6

21.

Figures

(Continued)

Write

Precompensation

Patterns

Read/Write

Data

Timings

Connector

Physical

Locations

Connector

Dimensions

Connector

Dimensions

Connector

Mounting

Physical

Dimensions

OVerall

Physical

Dimensions

Track

Format

Shipped

"Al"

Address

Mark

Byte

Tables

Jl/Pl

Connector

Assignments

J2/P2

Connector

Assignments

III

Connector

Assignments

Power

Requirements

Page

1.0

Introduction

1.1

General

Description:

The ST506

disc

drive

random

access

storage

device

with

two

non-removable

inch

discs

storage

media.

Each

disc

surface

employs

one

movable

head

service

153

data

tracks.

The

total

formatted

capacity

the

four

heads

and

surfaces

megabytes.

(32

sectors

per

track,

256

bytes

per

sector,

612

tracks).

Low

cost

and

unit

reliability

are

achieved

through

the

use

band

actuator

and

open

loop

stepper

head

positioning

mechani'sm. The

inherent

simplicity

mechanical

construction

and

electronic

controls

allows

maintenance

free

operation

throughout

the

life

the

drive.

Both

Electronic

PCB's

are

mounted

outside

HDA

for

field

serviceability.

Mechanical

and

contamination

protection

for

the

heads,

actuator

and

discs

are

provided

impact

resistant

aluminum

enclosure.

self

contained

recirculating

system

supplies

clean

air

through

0.3

micron

filter.

second

port

the

filter

assembly

allows

pressure

equalization

with

ambient

air

without

chance

contamination.

patented

spindle

pump

assures

adequate

air

flow

and

uniform

temperature

distribution

throughout

the

head

and

disc

area.

Thermal

isolation

the

stepper

and

spindle

motor

assemblies

from

the

disc

enclosure

yields

very

low

temperature

rise

within

the

enclosure,

providing

significantly

greater

off

track

margin

and

the

ability

immediately

perform

read

and

write

operations

after

power

with

thermal

stabilization

delay.

The

ST506

electrical

interface

similar

the

Shugart

Associates

SAlOOO

family

inch

fixed

disc

drives.

The

ST506

size

and

mounting

identical

the

industry

standard

minifloppy

disc

drives

and

uses

the

same

voltage

and

connector.

power

required.

Key

Features:

•

storage

Capacity

6.38

megabytes

unformatted,

5.0

megabytes

formatted

shipped.

•

Winchester

design

reliability,

9.5

gram

head

load

force,

micro-inch

flying

height.

• Same

physical

size

and

mounting

the

minifloppy.

• Same

voltages

the

minifloppy.

• Band

actuator

and

stepper

motor

head

positioning.

•

5.0

megabit/second

transfer

rate.

•

Simple

floppy

interface.

• Same

track

capacity

double

density

inch

floppy.

•

170

millisecond

random

average

access

time,

reducible

via

simple

software

algorithm

(See

Section

4.5.3)

1.2

Specification

Summary:

1.2.1

1.2.2

1.2.3

Physical

Specifications:

Environmental

Limits:

Ambient

Temperature

l22

SOOC)

Relative

Humidity

= 8

SO%

Maximum

Wet

Bulb

= 7SO

non-condensing

Maximum

Altitude

10,000

feet

Power

Requirements

+12V

5%,

1.SAtypical,

4.SA

power

+5V

5%,

0.7A

typica1#

1.0A

maximum

+12V/+SV

Maximum

Ripple

50mV

P-P

Mechanical

Dimensions:

Height

3.25

inches

Width

S.75

inches

Depth

S.OO

inches

Weight

4.2

1bs.

(1.9

kg)

Heat

Dissipation

watts

typical

watts

maximum'

Reliability

Specifications:

MTBF

11,000

POH,

typical

usage

Not

required

MTTR

minutes

Component

Design

Life

= 5

years

Error

Rates:

Soft

read

errors

*Hard

read

errors

Seek

errors

= 1

per

10~~

bits

read

= 1

per

bits

read

= 1

per

seek

*Not

recoverable

within

re-tries.

Performance

Specifications:

Capacity

1.2.4

Unformatted

Per

Drive

Per

Surface

Per

Track.

Formatted

Per

Drive

Per

Surface

Per

Track

Per

Sector

Sectors

per

Track

6.38

Megabytes

1.59

Megabytes

10416

Bytes

5.0

Megabytes

1.25

Megabytes

8192

Bytes

256

Bytes

Transfer

Rate

5.0

Megabits

per

second

Access

Time

Track

Average

(Inc.

Settle)l70

ms,

reducible

ms.

(See

Section

4.5.3)

Maximum

(Inc.

Settle)500

ms,

reducible

245

ms.

Settling

Time

Average

Latency

Functional

Specifications

Rotational

speed

Recording

density

Flux

density

Track

density

Cylinders

Tracks

R/W

Heads

Disks

8.33ms

3600

7690

255

153

612

rpm

bpi

max

fci

tpi

2.0

Functional

Characteristics

2.1

General

Operation

The

ST506

disc

drive

consists

Read/Write

and

control

electronics,

read/write

heads,

track

positioning

actuator,

media,

and

air

filtration

system.

The

components

perform

the

following

functions:

Interpret

and

generate

control

signals.

Position

the

heads

over

the

desired

track.

Read

and

write

data.

Provide

contamination

free

environment.

2.2

Read/Write

and

Control

Electronics

are

packaged

two

printed

circuit

boards.

The

primary

board

which

power,

control

and

data

signals

are

connected

includes:

Index

~etection

circuit.

Head

position/actuator

circuit.

Read/write

circuits.

Drive

speed

circuit.

Head

select

circuit.

Write

fault

detection

circuit.

Step

motor

drive

circuit.

Drive

select

circuit.

Track

zero

detector

circuit.

The

second

PCB.,

mounted

the

baseplate

under

the

primary

board

derives.

its

power

from

the

primary

board

and

provides

power

and

speed

control

the

spindle

drive

motor.

2.3

Drive

Mechanism

Brushless

drive

motor

rotates

the

spindle

3600

rpm.

The

spindle

driven

directly

with

belt

pulley

being

used.

The

motor

thermally

isolated

from

the

baseplate

minimize

temperature

rise

the

sealed

chamber

containing

the

heads

and

discs.

The

~otor

and

spindle

are

dynamically

balanced

insure

low

vibration

level.

brake

used

provide

fast

stop

the

spindle

motor

when

power

removed.

The

baseplate

shock

mounted

minimize

transmissibility

vibration

the

chassis

frame.

2.4

Air

Filtration

System

(Figure

The

discs

and

read/write

heads

are

fully

enclosed

module

using

integral

recirculation

air

system

with

absolute

filter

which

maintains

clean

environment.

Integral

the

filter

port

which

also

permits

pressure

equalization

with

the

ambient

air

without

contaminate

entry.

2.5

Positioning

Mechanism

(Figure

The

read/write

heads

are

mounted

ball

bearing

supported

carriage

which

positioned

band

actuator

connected

the

stepper

motor

shaft.

The

stepper

motor

thermally

isolated

from

the

baseplate

minimize

temperature

rise

the

sealed

chamber

containing

the

heads

and

discs.

AIR

fLOW

SCRU,1313IN

FtL

TER

FIG

DISC

SCR

131N

F1LTER

/ .

I3A

010

ETR

FILTER

FIG

DISC

'--

SPINDLE

tv1

~-'

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