Seagate ST-506 User manual

8T506

PRODUCT

MANUAL

c5S»

seagate

ST506

Product Manual

July

4,1983

36036-001

920 Disc Drive, Scotts

Valley,

95066-4544, USA

Telephone: 408/438-6550 •

Telex:

176455SEAGATE SCVL

c559

seagate

Notice

This manual and all the

material

contained in

are

copyrighted with

may

not be copied, in

whole

part,

without

written

consent of Seagate Technology.

Seagate reservesthe right

change,

without

notice, the

specifications

contained in

this

manual.

TABLE OF CONTENTS

SECTION

PAGE

1.0 Introduction

..................................................

1.1

General Description

........................................

1.2

Specification

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.1

Physical

Specifications.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.2 Reliability

Specifications.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.3 Performance

Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.4 Functional

Specifications.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.0 Functional Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1

General

Operation.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2

Read/Write and Control

Electronics.

. . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Drive

Mechanism.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Air

Filtration

System.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Positioning

Mechanism.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6 Read/Write Heads and

Discs.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.0 Functional Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1

Power Sequencing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Drive Selection

.....

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Track Accessing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Head Selection

...

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.5 Read Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.6

Write

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 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 2°,

.......................................

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 0

................................................

4.2.3 Write Fault

............................................

4.2.4 Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2.5 Ready

.................................................

4.3 Data Transfer Lines

................................

.I.

........

4.3.1

MFM Wr.ite 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 Operation Option

.................................

4.5.2

"0"

(Defeat Recal.) Operation

.............................

4.5.3

"H"

Half

Step

Option

....................................

4.5.4 Nylon Ground Washer

...................................

5.0 Physical Interface

..............................................

SECTION PAGE

5.1

J1/P1 Connector-Control Signals

..............................

5.2 J2/P2 Connector-Data Signals

.................................

5.3

J3/P3 Connector-DC Power

...................................

5.4

J10/P10 Frame Ground

Connector

.............................

6.0 Physical Specifications

.........................................

6.1

Mounting

Orientation

........................................

6.2

Mounting

Holes

.............................................

6.3 Physical Dimensions

........................................

7.0 Track Format .

.................................................

7.1

Gap 1

.....................................................

7.2

Gap 2

..........

.........................................

7.3 Gap 3

.....................................................

7.4 Gap 4

......

......................................

7.5

Defective Sector Flags

.......................................

LIST OF ILLUSTRATIONS

FIGURE PAGE

1.0

Air

Filtration

System/Head Disc

Assembly.

. . . . . . . . . . . . . . . . . . . . . .

2.0

Spindle Hub Air

Flow.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.0 Positioning Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.0 Power Up

Sequence.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.0 Control Signals

................................................

6.0 Data Signals

................................................

" 12

7.0 Typical Connections, 4 Drive System

..............................

iii

FIGURE PAGE

8.0

Control Signals Driver/Receiver Combination

.......................

9.0

Step General Timing

............................................

9.1

Slow Seek Step Pulse Timing

...................................

9.2

Algorithm Driven Seek

.........................................

10.0

Index Timing

.................................................

11.0 Data Line Driver/Receiver Combination

...........................

12.0

Write Precompensation Patterns

................................

13.0

Read/Write Data Timing

........................................

14.0 Option Shunt Block

...........................................

15.0

Interface Connector Physical Locations

..........................

16.0

Connector Dimensions

......................................

17.0

J2 Connector Dimensions

......................................

18.0

J3 Connector

.................................................

19.0 Mounting, Physical Dimensions

.................................

20.0 Overall Physical Dimensions

....................................

21.0

Track Format Example

.........................................

22.0

"A1"

Address Mark Byte

.......................................

LIST

TABLES

TABLE PAGE

J1/P1

Connector Pin

Assignments.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

J2/P2 Connector Pin Assignments

................................

III J3/P3Connector Pin Assignments

................................

Power Requirements

...............

........................

V Motor Start Current Requirements

...............................

1.0 Introduction

1.1

General Description:

The ST506

disc

drive is a random access storage device utilizing

two

non-removable

51/4

inch

discs

as storage media. Each

disc

surface

employs

one read/write head

service 153 tracks.

Low

cost

and

unit

reliability are achieved

through

the use

a band

actuator

and open loop stepper head

positioning

mechanism. The

inherent

simplicity

mechanical

construction

and electronic con-

trols

allow maintenance free operation

throughout

the

life

the

drive. Both

Boards are mounted

outside

the Head Disc Assembly

(HDA), allowing field serviceability.

Mechanical and

contamination

protection

for

the heads, actuator,

and

discs

is provided by

impact resistant aluminum enclosure. An

integral air recirculating system provides clean air through a 0.3

micron

filter. A second port in the

filter

assembly

allows

ambient air

pressure equalization

without

chance

contamination.

A 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

results in a very low temperature rise

within

the HDA. This provides

significantly

greater off-track margin and

the

ability

immediately

perform read and write operations

after

power up

with

no thermal

stabilization

delay.

The ST506 is

identical

in size and

mounting

configuration

the in-

dustry

standard

minifloppy

disc

drives. They use the same

voltages, and no

power is required.

Key Features:

• Storage Capacity

6.38 megabytes

unformatted,

5.0 megabytes formatted.

• Same physical size and

mounting

the

minifloppy.

• Same

voltages as

the

minifloppy.

• Band

actuator

and stepper

motor

head

positioning.

• 5.0 megabit/second

transfer

rate.

• Simple floppy-like interface.

• Same track capacity as a

double

density

inch

floppy.

-1-

1.2 Specification Summary

1.2.1

Physical SpecificationsIEnvironmental

Limits

Ambient Temperature

Operating:

Non-operating: 40°

122°F (4°

50°C)

-40°

140°F

(-40°

60°C)

Maximum Temperature Gradient

Operating: 18°F/hour or 10°C/hour

Non-operating: Below condensation

Relative Humidity:

Maximum Wet Bulb:

Maximum elevation

Operating:

Non-operating:

80% non-condensing

78.8

(26°C)

10,000 feet

-1,000

30,000 feet

Maximum Shock

Without

Incurring Physical Damage

Operating: 10G's*

Non-operating: 20G's*

*No mechanical damage

wi"

occur

within these limits.

D.C. Power Requirements

+ 12V

±5%,

1.6A typical, 3.5A (At power on)

±5%,

.7A typical, 1.0A (Maximum)

Maximum Ripple: 50mV peak to peak

(12V,

5V)

Mechanical Dimensions

Height:

Width:

Depth:

Weight:

Shipping Weight:

Heat Dissipation

Typical:

Maximum:

3.25 inches

5.75 inches

8.00 inches

4.6 pounds

(2.1

Kg)

9.0 pounds

(4.1

Kg)

watts

Maximum

Accoustic

Output: 50DBA @ 12" distance

1.2.2 Reliability Specifications

MTBF: 11,000 POH, typical usage

MTTR:

minutes

PM:

Not

required

Component design life: 5 years

-2-

Error Rates

Soft Read Errors*: 1 per

bits

read

Hard Read Errors**: 1 per

bits

read

Seek Errors: 1 per

6 seeks

*Recoverable

within

16 retries

**Not

recoverable

within

retries

1.2.3 Performance Specifications

Capacity

Per Drive:

Per Surface:

Per Track:

Access Time

Track To Track

Average*:

Maximum*:

Settling Time:

Formatted

5.0 Megabytes

1.25 Megabytes

8,182 Bytes

205 ms

*Using fast seek (includes settling)

Transfer Rate:

Average Latency: 8.33

1.2.4 Functional Specifications

Rotational Speed:

Recording Density:

Flux Density:

Track Density:

Cylinders: .

Tracks:

Read/Write Heads:

Discs:

·3·

Unformatted

6.38 Megabytes

1.59 Megabytes

10,416 Bytes

3ms

15ms

±10%

5.0 Mbits/sec

3,600

RPM

± 1%

7,690

BPI

7,690 FCI

255

TPI

153

612

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