Quantum ProDrive 40S, ProDrive 80S Product Manual

Quantum

ProD rive Series™

Intelligent Disk Drives

ProDrive™ 40S/80S

Product Manual

Quantum Corporation

730-00-9302 .

Rev: A

Date: 6/88

Quantum ProDrive Series™

Intelligent Disk Drives

ProDrive™ 40S/S0S

Product Manual

Quantum

730-00-9302

Corporation

Rev: A

Date: 6/88

ii

PREFACE

Quantum reserves the right

to

obligation

Quantum publishes descriptive brochures and
Manuals for each product line.
Technical Support Bulletins which are sent
changes to the content

Quantum publications
Quantum

Publication No.

incorporate such changes

in

the

same

730-00-9302 Rev. A

to

make changes and/or improvements to its products without incurring any

In

addition, important changes to a product are conveyed in the

of

a manual are covered

may

be

requested from your Quantum Sales Representative,

manner

as

spare

UL

recognition

CSA

certification granted under File No. LR49896

VDE

certification granted

or

improvements

to

parts.

in

units previously sold

data

sheets, Product Manuals, and Technical Reference

all product customers

by

publishing Addenda to the affected manual.

of

record. Those changes which require

or

shipped.

or

may

UUCSANDE

granted

under

File

No. E78016

per

File No. 11342-3250-2003/AIA

fonn

be

ordered from

of

Quantum
two
further details

directed

Product covered

4,647,769; 4,647,997; 4,661,696;

ProDrive

years from the date

to

the Quantum service center in your area.

AIRLOCl(®

disk drives are warranted against defects in material and workmanship for a period

of

shipment.

can

be

obtained from your Quantum sales representative. All requests for service should be

or

licensed under the following U.S. Patents: 4,538,193; 4,593,194; 4,639,798;

OCopyright

ProDrive

Nand

ProDrive Series

and

DisCaclae@are

WARRANTY

The

warranty includes parts and labor. This is a limited warranty;

PATENTS

4,669,004; 4,703,176.

1988, Quantum Corporation. All rights reserved.

Nare

registered trademarks

Printed

Other

trademarks

in

U.S.A.

patents pending.

of

Quantum

of

Quantum

Corporation.

Corporation.

of

iii

SERVICE CENTERS

Quantum Service Center

1804 McCarthy Boulevard
Milpitas, California
408-432-1100

95035

Quantum Gmbh
Hanstrasse
0-6000
West Germany
Phone: [phone]
Telex: 4-17-166

70

Frankfurt/M-

71

iv

TABLE OF CONTENTS

SECTION

1 - GENERAL DESCRIPTION AND SPECIFICATIONS

1 . 1 GENERAL DESCRlPTlON. . . . . . . . . . . . . . . . . . . . . . . . .

1

.1

1.2

.1

~'TIC)t6

1 .2.1 Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . 1 -2

1 .2.2

1.2.3

1

.2.4

1.2.5

1 .2.6

Applicable

Perfonnance
Functional
Reliability

hnlStics.

Standards

Documents.

...••.•.••....•...•..•.......•

Specffications. . . . . . . . . . . . . . . . . . . . . 1-3

Specifications.

Specification. . . . .

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

and

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

Regulations.

..

. . . . . . . . . . . . . . . . . . . . . 1-4

.'.

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

..

..

. . . . . . . . . . . . . . . . . . . . 1-5

SECTION 2 - INSTALLATION AND OPERATION

2 . 1 I'6'T

2.

2

2.3

2.

4

AL.LA

'J1C)tII. • • • • . . . • • . . . • . • . . . . . . . . • • • • • • .

2.1.1

2.1.2

2.1.3

2.1 .4

VB'f11LA~...............................

INTERCONNECTING

2.3.1

2.3.2

ClF'ERA~.................................

2.4. 1

2.4.2

2.4.3

2.4.4

2.4.5

2.4.6

2.4.7

Space

Requirements.

Unpackaging

Mounting.

Power

DC

Power

~ICon~r

General

Self

Seek

Enable

Wait

SCSI

Faceplate

Driver

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Requirements.

CABLE

Connector.

Procedures

Test

Parity

Option.

Spin

Option. . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Bus

Device

LED

Tenninators.

. . . . . . . . . . . . . . . . . . . . . . . 2-2

Instructions.

. . . . . . . . . . . . . . . . . . . . . 2-2

. . . . . . . . . . . . . . . . . . . . . . . 2-4

CONNECTORS. . . . . . . . . . . . . . 2-6

. . . . . . . . . . . . . . . . . . . . . . . 2-6

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

. . . . . . . . . . . . . . . . . . . . . . . . 2-7

Option

. . . . . . . . . . . . . . . . . . . . . . . 2-8

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

Identification.

Operation.

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

. . . . . . . . . . . . . . . . . . . . . 2-8

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

..
..
..

1-1
1-1
1-1

1 -5

1-5

2-1

2-5

2-6
2-7

2-8
2-8
2-8

SECTION 3 - PRINCIPLES OF OPERATION

3 . 1

3 • 2 PIoDrlve

ProDrive

3. 1

.1

3. 1 .2

3.1.3

3.1 .4

3.1.5

3. 1

.6

3.1 .7

3.2.1

3.2.2

3.2.3

3.2.4

DRIVE

MEaiANlSM.

Base

Disk

Rotary
t-teadstack

~

Automatic

Air

Ritration.

DRIVE

General

Head

ReadlWrite System. . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Interface

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

Casting

Stack

Assembly.

. . . . . . . . . . . . . . . . . . . . . . 3-2

Assembly. . . . . . . . . . . . . . . . . . . . . .

Positioner

Assembly

(Actuator)

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

Assembly. . . . . . . . . . . . . . . . . . . . . . . . 3-2

Erlcxx:Ier.

Actuator

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

Lock.

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

..

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

ELECTRONICS.

Desaiption. . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Positioning

Control. . . . . . . . . . . . . . . . . . . . . . . .

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

System

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

..

..

..

..

3-1

3-2

3-2

3-2
3-3

3-4
3-4
3-6

v

Table

of

Contents (Cont.)

SECTION 4 - SCSI INTERFACE

4.1

4.2

4.3

~

At.ISI~

4.2.1 Conformance

4.2.2

SCSI

INTERFACE CHARACTERISTICS. . . . . . . . . . . . . . . "

4.3.1

4.3.2

4.3.3

4.3.4

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

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

Level

and

Hardware

General

SCSI

Bus

SCSI

Implementation

Description. . . . . . . . . . . . . . . . . . . . . .

Electrical

SignaJs

Bus

Characteristics ~ . . . . . . . . . . . . . . . . . . . 4-2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

liming.

. . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Altematives. . . . . . . . . . . . . .

Choices. . . . . . . . . . . . . . .

SECTION 5 - SCSI PROGRAMMING GUIDELINES

5.

1

GENERAL

5 . 2

5

5.4

5 • 5

5.6

5.

5.8

5 . 9

5.

5.

SCSI

5.2.1

5.2.2

5.2.3

5.2.4

5.2.5

5.2.6

5.2.7

5.2.8

5.2.9

5.2. 1

• 3

SCSI

5.3.1

5.3.2

SCSI

5.4. 1

5.4.2

5.4.3

SCSI
MESSAGE

5.6.1

5.6.2

5.6.3

7 COMMAND

5.7.1 Command Descriptor
COMPLETION
READING

5.9.1

5.9.2

5.9.3

1 0

CONFIGURING

5.10.1 PIoDrlwOperating Modes. . . . . . . . . . . . . . . . . .

5.10.2

11

COMMAND

5.11.1

5.

11

5.11.3

5.11.4

5.11.5

5.11.6

DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . .

BlJS PIiASES. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bus

Free

Phase. . . . . . . . . . . . . . . . . . . . . . . .

Arbitration
Selection
Reselection
Information
Command

Data

Status

Message

0 Signal Restrictions Between Phases. . . . . . . . . . . . . .

BUS

CONDI'fIOt\IS.

ATTENTION
RESET

BUS

PHASE

Non-Arbitrating

Arbitrating

All

Systems

Fl()INI'EfIS.

SYSTEM

Message

Messages.

Message Error Recovery Strategy. . . . . . . . . . . . . . . . . . 5-13

IMPLEMENTATION.

STATUS

AND

WRmNG.

Logical
Logical

Transferring

Operating

DESCRIPTIONS.

TeST UNIT READY Command: Opcode =

.2 REZERO UNIT Command: Opcode =

REQUEST SENSE Command: Opcode = 03(hex). . . . . . 5-22

FORMAT UNIT Command: Opcode = 04(hex). . . . . .

REASSIGN BLOCKS Command: Opcode = 07(hex). . . . . . . . 5-35

READ Command: Opcode = 08(hex)

Phase. . . . . . . . . . . . . . . . . . . . . . . . . .

Phase. . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Phase

(Optional)

Transfer

Phase

Phase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Phase. . . . . . . . . . . . . . . . .

Phases

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

. . . . . . . . . . . . . . . . . . . 5-3

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

'.

Phase. . . . . . . . . . . . . . . . . . . . . . . .

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

Condition.

Condition

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

SEQUENCES.

Systems. . . . . . . . . . . . . . . . . . . . . . 5-7

Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

SPECIRCA

Protocol. . . . . . . . . . . . . . . . . . . . . . .

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

BYTE. . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18

Blocks.

Block

THE

PRODRIVE.

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

Address

Data. . . . . . . . . . . . . . . . . . . . . . . . . . 5-19

Mode

Tables. . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . 5-7

. . . . . . . . . . . . . . . . . . . . 5-7

. . . . . . . . . . . . . . . . . . . . . . . . 5-7

nON.

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

. . . . . . . . . . . . . . . . . . . . . 5-14

Block (COB). . . . . . . . . . . . . . . . . . 5-15

Ranges. . . . . . . . . . ~ . . . . . .

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

. . . . . . . . . . . . . . . . . . . . . . . 5-21

OO(hex).

01

(hex). . .

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

4-1
4-1

..

4-1

..

4-1

4-1

..

4-1

5-1
5-1

..

5-1
5-1

5-4
5-5

. . . . . . . . . . 5-6

..

5-6

..

5-6

'.

. 5-7

" 5-7

..

5-9

..

5-9

..

5-10

..

5-17

..

5-18

..

5-19

..

5-20

..

5-20

..

5-20

. . . . . . . . 5-21

..

....

..

5-22
5-28

5-36

vi

Table

of Contents (cont.)

5.11.7

5.11.8

5.11.9

5.11.10

5.11.11

5.11.12

5.11.13

5.11.14

5.11.15

5.11.16

5.11.17

5.11.18

5.11.19

5.11.20

5.11.21

5.11.22

5.11.23

5.11.24

5.11.25

5.11.26

SECTION

6 • MAINTENANCE

WRITE
SEEK
INQUIRY
MODE
RESERVE
RELEASE
MODE
START/STOP
SEND
READ
READ
WRITE
SEEK
WRITE
VERIFY
READ
WRITE
READ
READ
WRITE

6.1 <E&Al..1JESC:FF

6.2

6.3

6.4 MAINTENANCE

~PfECAU1'IC)t6.....................

PREVENTA11VE

6.4.1

6.4.2

MAHrENANCE. . . . . . . . . . . . . . . . . . . . .

LEVELS,

Levels

Tools,

Command:

Command:

Opcode =

Command:

SELECT

Command:

Command:

Command:

SENSE

DIAGNOSTIC
CAPACITY
EXTENDED

EXTENDED

EXTENDED

AND

Command:

UNIT

~mand:

VERIFY

Command:

DEFECT

BUFFER
BUFFER
LONG

LONG

I'ICJIII.

of

Maintenance.

Equipment

DATA

Command:

Command:

Command: Opcode = E8(hex). . . . . . . . . .

Command:

• . . . • . . . . . . . . . . . . . • • • • . •

TOOLS,

and Spares. . . . . . . . . . . . . . . . . . . . 6-2

Opcode =

Opcode

Command:

Command:

Command:

Command:

Command:

Command:

Opcode = 2F(hex). . . . . . . . . . . . . . . 5-63

OA(hex).

OB(hex).

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

. . . . . . . . . . . . . . . 5-38

= 12(hex). . . . . . . . . . . .

Opcode

Opcode

Opcode

Opcode

Command:

Opcode

Opcode

Opcode

EQUIPMENT

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

= 15(hex). . . . . . . . . . . 5-41

= 16(hex). . . . . . . . . . .

= 17(hex). . . . . . . . . . .

= 1A(hex). . . . . . . . .

Opcode

Opcode = 10(hex). . . . . . . . . 5-59

Opcode

Opcode

Opcode = 2A(hex). . . . . . . . . 5-61

Opcode

Opcode = 2E(hex). . . . . . . . . 5-62

= 1 B(hex). . . . . . . . . 5-58

= 25(hex). . . . . . . . . . 5-60

= 28(hex). . . . . . .

= 2B(hex). . . . . . . . . 5-62

Opcode = 37(hex). . . . . . . . 5-64

= 3B(hex). . . . . . . . . . . 5-66

= 3C(hex). . . . . . . . . . . 5-67

= EA(hex). . . . . . . . . . . . 5-69

AND

SPARES. . .

..

..

..

..

..

..

..

5-37
5-38
5-52

5-53
5-54

5-61

5-69

6-1
6-1
6-1
6-1
6-1

APPEHIX

APPENDIX

APPENDIX

~D·(lCBSARY

APPENDIX E • QUANTUM

A· DISCAQE®. . . . . .

B·

TRACK

IntrtxIuction.

TI'CICk

ForrTlat.

Track

and

C·

MEDIA

IrlIn:xilIction

[)efect [)etection .

[)efect

Marlagernerll. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Error

CaTectirlg

Retum

AeIlair

Material

Cf1arges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ProOr1ve

FORMAmNG

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

. . . . . • . . . . . . . . . . . . . . . . . . . . . . . . .

Cylinder

DEFECT

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

Ccx:Ie.

Authorization

Series

Drive

APPENDICES

Skewing.

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

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

REPAIR

Revision

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

HANDUNG

AND

ERROR

CORREcnNG

CODE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

.

PROCEDURE

(RMA

or

RA). . . . . . . . . . . . . . . . . . . .

Identification.

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

..

..

..

..

..

..

A-1

B-1
B-1
B-1

C-1
C-1
C-1

0-1

E-1
E-1
E-1

vii

TABLES

IIbII

1-1
2-1
4-1
5-1
5-2
5-3 Transfer
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
5-22
5-23
5-24
5-25
5-26 RElEASE
5-27
5-28
5-29
5-30
5-31
5-32
5-33
5-34
5-35
5-36
5-37
5-38
5-39
5-40
5-41

5-42
5-43
5-44
5-45
5-46

A-1

Vbration~.............................

DC

Power

Signal

SaJrces.

Information

Message

Ccmnarlcm

SIaIlJs

Byte

Status

Byte

PtolJtIve

TEST

UNIT
REZERO
REQUEST
EXTENDED
SENSE
FORMATUNITConmand
FORMAT

Defect

list -

REASSIGN
REASSIGN
READ

Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-36

WRITE
SEEK

Camland. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38

INQUIRY
INQUIRY
MODE
MODE
RESERVE

MODE
MODE

SENSE
STARTISTOP
SEND

DIAGNOSTIC

READ

CAPACIlY Command. . . . . . . . . . . . . . . . . . . . . . . .

READ

CAPACIlY Data. . . . . . . . . . . . . . . . . . . . . . . . . . .

READ

EXTENDED
WRITE
SEEK

EXTENDED
WRITE
VERIFY
READDEFECTDATAConmand

[)efec:t list

PIlysicaI

Bytes

Offset

WRITE
READ

BUFFER

READ

BUFFER

READ

LOOG

WRITE

t:JII!It:actIe

I!Ia

1-2

Requirements. . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Transfer

Codes

Rates

~

. • . . . . . . . . . . . .

Code

S1atus

READY

UNIT

SENSE

ERROR

UNIT

LOGICAL
BLOCKS
BLOCKS

Phases. .

Sl4JIX)rted

Supported/Transfer

by

Bit

Values. . . . . . . . . . .

Ccxtes.

Camland.

.'

. . . . . . . . . . . . . . . . . . . . . . . . 5-4

by

the ProDrItIe. . . . . . . . . . . . . . .

Period

Values. . . . . . . . . . . . . . . . 5-11

the

ProDrItIe.

. . . . . . . . . . . . . . . . •

.~

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

..

. . . . . . .

.'

. . . .

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

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

Camland. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22

Conmand. . . . . . . . . . . . . . . . . . . . . . . . . . 5-22

SENSE

Formal. . . . . . . . . . . . . . . . . . . . . . . .

Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

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

Command

Variations.

BLOCK

. . . . . . . . . . . . . . . . . . . . . . 5-29

FORMAT. . . . . . . . . . . . . . . . . . . . . 5-30

Command. . . . . . . . . . . . . . . . . . . . . .

Defed list. . . . . . . . . . . . . . . . . . . . . .

Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-37

Camland. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-39

DATAFormat. . . . . . . . . . . . . . . . . . . . . . . . . . .

SElECT Command. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-41

SELECT

Parameter

list. . . . . . . . . . . . . . . . . . . . . . . . . 5-42

Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-53

Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-53

SENSE

Camland. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-54

Data.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-56

UNIT

Camland. . . . . . . . . . . . . . . . . . . . . . .

Command. . . . . . . . . . . . . . . . . . . . . . . . . 5-59

Command. . . . . . . . . . . . . . . . . . . . . . . . . . 5-61

EXTENDED
AND

VERIFY

Conmand. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

~.

SeeD-

Fran

BUFFER

LONG

PrograrnrnabIe

Command.

Conmand. . . . . . . . . . . . . . . . . . . . . . . . . . 5-62

Command.

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

. . . . . . . . . . . . . . . . . . . . . . . . 5-62

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

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

Fermat.

Cammal

Conmand. . . . . . . . . . . . . . . . . . . . . . . . .

~.

Command.

Command.

Index

. .

..

. . . . . . . . . . . . . . . . . . . . . . . . . 5-65

Format.

Kt.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-68

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

. . . . . . . . . . . . . . . . . . . • . . • . . . 5-66

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-69

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

Parameters.

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

..

. 2-5

..

..

..

..

..

..

..

..

..

..

.,

..

..

..

..

..

.'

. . . 5-65

..

..

..

5-1
5-15

5-17
5-17
5-18
5-21

5-23
5-28

5-35
5-36

5-39

5-58

5-60

5-60
5-61

5-63
5-64
5-65

5-67

5-69

A-3

0

viii

f.kID 2IaI

2-1
2-2
2-3
2-4
2-5
2-6
2-7
3-1
3-2 M
3-3
3-4
4-1
4-2
5-1
5-2
5-3

B-1

B-2

C-1
C-2

AoOWe

AoOWeP~

AoOWeMounting

AoOWeMounting Saew Clearance. . . . . . . . . . . . . . . . . . . .

DC
SCSI

Shorting

AoOWe

Head

FteaiWriIe

SCSI
SCSI

Phase
Phase

Sin1lIified

ExarT1lIe
ExarT1lIe

Factory

Field

Mechanical

Assembly. . . . . . . . . . . . . . . . . . . . . . . .

Power

Cori1ector

Coni19ClOr'

PluglTenninator

(J1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Exploded

Filbc::dion.

Positioning

Bus

Bus

Sequenc:a;

Found

. . . • • . . • . . . . . . . . . . . . . . . . . . . . • . . . • . 3-3

Electronics.

Block

DacJram.

Pin

Assignments.

Trring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Sequences

SCSI

System

of

a 7

-8ector

of

a

15-Sector

Found

Defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Defects. . . . . . . . . . . . . . . . . . . . . . . . . . . .

FIGURES

Dimensions.

Dimensions.

(J2). . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Location

VtfNI. . . . .

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

..

..

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

..

..

on

PCB

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

..

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

..

..

. . . . . . . . . . . . . . . . . . . . . . . . . 3-4

. . . . . . . . . . . . . . . . . . . . . . : . . . . 3-5

. . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

without

with

Arbitration.

Arbitration.

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

Track

Skew. . . . . . . . . . . . . . . . . . . . . . . .

Cytinder

. . . . . . . . . . . . . . . . . . . . . 5-8

. . . . . . . . . . . . . . . . . . . . . . . 5-8

Skew. . . . . . . . . . . . . . . . . . . . . .

..

2-1
2-2
2-3
2-4

2-7
3-1

5-9

B-1

B-2

C-3

ix

x

SECTION 1

GENERAL DESCRIPTION AND .SPECIFICATIONS

1.1

The Quantum ProDrive
disk platters as storage media. These drives feature formatted capacities ranging from 42 to 168 megabytes
and a variety
industry-standard
megabytes
megabytes
powerful SCSI commands

efficiently managed within these products and can
drives feature an innovative design using an integrated controller, minimum number
control

of

NOTE:

1.1.1

This document provides a general description
of

operation, interface command implementation, and maintenance. Additional infonnation pertaining to

SCSI interface may be found in the ANSI X3.I31-1986, Small Computer System Interface

the
Specification Common Command

1.2

GENERAL DESCRIPTION

Series™

of

interfaces. This manual covers the

Small Computer System Interface (SCSI) host interface. The ProDrive 40S has 42

of

formatted capacity on two disks with three movable heads; the ProDrive 80S has 84

of

formatted capacity on three disks with six movable heads. These drives make optimum use

to

product quality during manufacture. The result is low cost, high reliability products.

Throughout this manual, ProDrive 40S/80S
40S

or

the ProDrive 80S. ProDrive 40S and ProD rive 80S will be used to refer specifically

42

to the

and 84 megabyte versions, respectively.

is a family

provide maximum system performance. Media defects and error recovery are

of

ten hard disk drives using non-removable 3 1/2-inch rigid

ProDrive™40S

be

fully transparent to the user. The

or

ProDrive will refer to either the ProD rive

and ProDrive 80S, which feature the

ProDri:ve

of

parts, and close

APPLICABLE DOCUMENTS

of

the

ProDrive

Set, Rev 4B, (by an ANSC X3T9.2 working group).

40S/80S, including installation, principles

SPECIFICATIONS

Series

of

Key features

• Formatted storage capacity

• Industry-standard (ANSI) SCSI host interface, CCS, Rev 4B

• Fully integrated SCSI controller

• Industry standard 3 1/2-inch form factor

• Data transfer rate
synchronous

• Full disconnect/arbitrate/reconnect capability

• 64 KB look-ahead, programmable DisCache®

•

19

• 48 bit computer generated cyclic ECC (Error Correcting Code) with
. capability

• Automatic retry for read disk errors

• Transparent defect mapping

• High-performance in-line defective sector skipping and reassignment
sectors without need to reformat

• Buffer memory parity and SCSI bus parity

•

Patented

• Read/Write with

• Support for 512, 1024, and 2048 byte logical block sizes

• Multiple block data transfer up to 64K blocks

of

the ProDrive 4OS/80S include:

of

42

or

84 megabytes

of

up to 2.0 megabytes/second asychronous, 4.0 megabytes/second

msec average access time

AIRLOCK® automatic shipping lock and dedicated landing zone

1:

I interleave operation .

II-bit

burst correction

of

new defective

General Description and Specifications 1-1

Section

General

1

Description

and Specifications

1.2.1

Environmental

PHYSICAL SPECIFICATIONS

Limits

Ambient Temperature -

Ambient Relative Humidity Non-Operating:

Altitude (relative to sea

l~vel)

Mechanical Dimensions (Exclusive

Height
Width
Depth
Weight

=
=
=
=

1.625 in.

4.0 in.

5.75 in.

1.9 lb.

(41.3 mm)
(101.6 mm)
(144.9 mm)

(0.88 kg)

Non-Operating:

Operating:

Operating:

- Non-Operating:
Operating:

of

Faceplate)

-40°F to 140°F (-40°C to 65°C)

42°F/hr (20°C/hr) gradient

39°F to 122°F (4°C to 50°C)
23°F/hr (IO°C/hr) gradient

5% to 95% without condensation

Maximum wet bulb

8% to 85% without condensation
Maximum wet bulb

-200 (-60M) to 40,000 ft. (12

-200 (-60M) to 10,000 ft. (3 km)

= 115°F (46°C)
= 79°F (26°C)

km)

Heat Dissipation

Average
Typical

Power consumption includes power dissipated by drive's SCSI bus terminators.

Shock

Table
axes (the principal drive base axes). The term "operating" implies that the drive will be fully functional
while being subjected to the shock or vibration level listed during operation. "Non-operating" implies that
there will be no change in performance once the drive is powered up after being subjected to the listed shock
or vibration in the powered-down (non-operating) condition.

and

I-I

lists specified levels for shock and vibration applied to any

Power Consumption (idle):

Power Consumption (30% Seeking):

Vibration

TABLE 1·1 Vibration

VIBRATION:

5-500 Hz Sine Wave (Peak to Peak)

1 Oct/Min

SHOCK:

1/2 Sine Wave

11

Sine Sweep

of

msec Duration ( 1 0 hits maximum)

8 Watts (27.3 BTUlHr)
9 Watts (30.7 BTUlHr)

of

the three mutually perpendicular

and

Shock Specficiation

Operating

O.50G

lOG

(1

soft error/shock)

(6 G No soft errors)

Non-Operating

2.00G

60G

In addition, the ProDrive as packaged in the shipping container will withstand drops onto a concrete
surface from 48 inches on all surfaces, six edges and three comers. It will withstand vibration applied to

of

the container

1·2

0.5 G, 5-100 Hz (0 to Peak) and

General Description and Specifications

1.5

G, 100-500 Hz (0 to Peak).

Section 1

General Description and Specifications

1.2.2

PERFORMANCE SPECIFICATIONS

Capacity

Fonnatted capacity (MB) *

Number

of

512 byte sectors

* One megabyte is defined as 220 bytes

Data

Transfer

Seek Times/Miscellaneous Times

DESCRIPTION

Single Track Seek (msec)
Average

1/3
Full
Average Rotational Latency (msec)
Sequential Head Switch (msec)

Power-U~

Rates Buffer to SCSI Bus - Up to 2.0 Mbytes/second asynchronous,

Disk to Buffer -

Seek (msec)

Stroke Seek (msec)

Stroke Seek (msec)

Time (sec)

ProDrive 40S

82,029

TYPICAL

NOMINAL

CONDITION

6

19

:!)

35

8.3

3.0

13

ProDrive 80S

40

4.0 Mybtes/seconds synchronous

Up

to 1.25 Mbytes/second in bursts

NOMINAL

CONDITION

7

21

23

40

8.3

3.0 3.0

15

80

164,058

MAXIMUM

WORST

CONDITION

CASE

7

23

25

45

8.3

18

NOTES: Quoted seek times include head settling time but do not include command overhead or latency

Seek time is the time required for the actuator to seek and settle on track.

time.

Seek times are measured by averaging 1000 seeks

of

the average

1000 random seeks. In the rare occurrence

of

the indicated length. Average seek time is

of

a seek error, any individual seek

may take up to 5 seconds for recovery.

of

Sequential head switch time is the time required for the head to move from the end

of

sector on a track to the beginning
cylinder. This time is fixed by the track skewing feature

the next sequential sector, located on the next track, same

of

the drive. (See Appendix B.)

the last

Power-up time is the time from the supply voltages reach operating range to the time the drive

to

accept

aU

is able

Nominal conditions are defined as
applied shock

commands.

0

25

C ambient temperature, nominal supply voltages, and no

or

vibration. Worst case conditions are defined as worst case extremes

of

temperature and supply voltages.

General Description and Specifications

1·3

Section 1

General Description and Specifications

Media Quality

The ProDrive features defect management, which eliminates the need to manually identify defects. Defect

is

management

completely transparent to the user. See Appendix C for a detailed description

of

the

ProDrive defect handling procedure and ECC (Error Correcting Code) capability.

Error

Error rates are defined by Quantum as follows:

2)

3)

4) Unrecoverable errors are those whose final retry error pattern is uncorrectable using ECC: retry reads

Rates

Random Data Errors (2):
Defect Data Errors (3):
Unrecoverable Data Errors (4):
Seek Errors (5):

1)

A data error
over at least

shock or vibration.

Random errors are those which do not exhibit a repeating error pattern, i.e
twice in a row within a specified number
once data
probably not due to media defects.

Defect errors are those which exhibit a repeating error pattern, i.e
within eight retry reads. and cannot be read without error up to that point.
to media defects. The sectors will be automatically reallocated
Enabled bit in page 1 H and the Reallocate Uncorrectable Error Enabled bit in page 39H
MODE SELECT command are set to
See Appendix C for a description

are terminated by either a repeating error pattern, or eight attempts without reading correctly.

is

one (1) sector read incorrectly. Data error rates are defined as average rates measured

1000 different sectors under any

is

read correctly.) The sectors will not be automatically reallocated since the errors are

1 error per
1 error per
1 error per
1 error per

of

retry reads; the default is eight. (Retries are terminated

See Appendix C for information on defect handling.

1.

(The default is 0: automatic reallocation is not performed.)

of

error correction options.

10

10

bits read (maximum)

12

10

bits read (maximum)

14

10

bits read (maximum)

106 seeks (maximum)

of

the specified operating conditions except applied

.•

the error does not occur

.•

the error occurs twice in a row

Such errors are likely due

if

the Automatic Read Reallocation

of

the

in

5) A seek error is any seek
the drive must go through a full recalibration routine to locate the desired cylinder. A full
recalibration takes approximately five seconds.

1.2.3

FUNCTIONAL SPECIFICATIONS

which the drive does not locate the desired cylinder.

ProDrive 40S ProDrive 80S

1·4

Nom Rotational Speed (RPM)
Max Recording Density (bpi}
Max Flux Density (fei)
Track Density (tpi) 1,000 1,000
Data Cylinders
Data Tracks
RlWHeads
Disks
Encoding Scheme

General Description and Specifications

3.662 ±O.3% 3.662

22.055 22.055
14,700

834

2,502

3
2

RLL 2,7 RLL 2,7

14.700

5,004

or

any seek in which

±O.3~

834

6
3

Section 1

General Description and Specifications

1.2.4

MTBF:
PM:
MTTR:
Start/Stop:

1.2.5

Idle Mode: 45

1.2.6

The

a)

b)

c)

d)

RELIABILITY SPECIFICATIONS

50,000 POH typical usage
Not required
30

minutes

10,000 cycles

ACOUSTICS

dBa

maximum at 1 foot in any direction

STANDARDS AND REGULATIONS

ProDrive disk drives satisfy the following standards and regulations:

U.L.:

CSA:
SDA:

VDE:

FCC:

Standard 478, Standard for Safety, Electronic Data Processing Units and Systems

Standard C22.2-154 Data Processing Equipment
Standard C22.2-143 Office Equipment

VDE 0806, (IEC 380), Standard for Office Appliances and Machines

FCC Rules for Radiated and Conducted Emissions, Part 15, Sub Part
Equipment

J, For Class B

General Description and Specifications

1·5

Section 1 General Description and Specifications

(This page intentionally left blank..)

1-

6 General Description and Specifications

INSTALLATION

SECTION 2

AND OPERATION

2.1

2.1.1

The ProDrive disk drives are shipped with a faceplate installed and shock mounts mounted directly to the
base casting. Figure

INSTALLATION
SPACE REQUIREMENTS

2-1

shows the external dimensions

of

the drives.

104.2

438

All dimensions in millimeters

FIGURE 2-1 ProDrive Mechanical Dimensions

~

Installation and Operation 2 - 1

Section 2

Installation and Operation

2.1.2

UNPACKAGING INSTRUCTIONS

a) Open the shipping container.
b)

Lift shipping container material and remove drive.

Figure 2-2 illustrates the 8-pack packing assembly for the
identifies each item.

ProDrive. The list following the figure

/"-

INSERTS

/ 4PL

./

/_.

BOTTOM

./.

STY

FIGURE

PackinK

NOTES: After unpacking the disk drive(s), store the packing materials for possible future use.

2 - 2 Installation and Operation

Assembly

Item

Descrjptjon:

A. Shipping Container (8-pack)
B.

C.

D.

Internal Padding

ProDrive Disk Drive

Package inserts

The

ESD bag

is

used to prevent electronic component damage during handling and shipment.
You should ensure that your handling and shipping procedures will also preclude damage due to
electrostatic discharge.

2·2

ProDrive Packing Assembly

Section 2

Installation and Operation

2.1.3

The ProDrive may be mounted in any orientation. The mounting bracket with'integral
designed for this purpose. Figure 2-3 shows

holes on each side

MOUNTING

of

the bracket.

T

the location

1'04.1

of

the mounting bracket

±.30

---,..

D

••

ami

the .four mountin,g

;:

D

D

shoc.J<.mo

unts

'.

is

o

DD

2.7±.1~

All dimensions

FIGURE 2-3 ProDrive Mounting Dimensions

The base casting is very close to the drive mounting bracket. Mounting
must be chosen so that
through the mounting bracket holes.
the mounting hole threads and avoid damaging ,orplaoing

To

casting.
the mounting screws must not exceed 8 inch-pounds.

avoid stripping the mounting hole ;ihreads,

no

more than the specified length

See Figure 2-4. This .length will allow full use

'01'6±'30

in

millimeters

__

;themaximum

~

...

of

screw

:unw.ante.d

ll

thread

stress on the base

'torque applied to

~

:9OF.ew

!kmg:ths

protrudes

of

Installation and Operation 2 • 3

Section 2

Installation. and Operation

"'"

"""',,

50

..

"

~

l

r~

i .130

I .

: \

5.5mm-l

"T!6

FIGURE

2.1.4

DC Power

The voltages and current requirements
sequencing either
power.

POWER REQUIREMENTS

OFF

Voltage

2·4

or

ON is required by the

Nominal
Tolerance

\

\ :

J~

r~

\ I

!c::==========~}

.....--

____

....,

J

\

\ I \

\

"-

PCB

HARD

DISK

ASSEMBLY

ProDrive Mounting Screw Clearance

of

the DC Power supplied to the drive are listed below. No power

ProDrive.

Power requirements include SCSI terminator

+12V
±10%

+SV
±S%

Current

Ripple

2 • 4 Installation and Operation

and

Noise

Typical (Idle)
Typical (Seeking)
Maximum (Power Up)

Maximum

O.SOA
O.80A

1.60A
100

mV

P-P

O.SOA
O.60A

0.6SA
SO

mV

P-P

Section 2

Installation and Operation

Drive

Startup

12

Volt Supply - ProDrive 40S/80S Start Current Profile (Typical Average)

2

112

(A)

1

I

o

-

t

t=O,

power on

Power Sequencing

Current

Profile

~

~~

~

rIIIIIIIIl

~

,

3

SECONDS

l.J

~

4

No damage or loss
may be lost in the sector being written at the time
transient voltages
opening up

Power Reset Limits

+5

+12 Volts: 10.2 to 9.6 Volts

When powering up, the drive will remain reset (inactive) until both reset limits are exceeded. When
powering down, the drive will become reset when either supply voltage drops below the lower threshold:
hysteresis is

2.2

The

ProDrive

(500C).
temperature

Any user-designed cabinet should provide adequate air circulation so that this maximum air

of

data will occur if power

+ 10% to -100% from nominal while powering up

of

either voltage

Volts:

50 m V minimum.

or

4.6

to 4.5 Volts

return line.

is

applied or removed during drive operation, except that data

of

power loss. In particular, the drive can sustain

or

down, as well as the shorting out or

VENTILATION

operates without a cooling fan provided the ambient air temperature does not exceed 122°F

is

not exceeded.

Installation and Operation 2 - 5

Section 2

Installation and Operation

2.3

2.3.1

The DC power connector (J2)
the PCB near the SCSI connector. See Figure 2-5. The recommended mating connector (P2) (AMP PIN
480424-0) utilizes AMP pins [PIN 350078-4 (strip) or PIN 61173-4 (loose piece)]. J2 pins are labeled on
the J2 connector.

NOTE: Pins 2 and 3 are connected on the drive.

2.3.2

INTERCONNECTING
DC POWER CONNECTOR

is

a 4-pin DuPont Connector (SK 20055-(00) mounted on the back edge

Pin I +12 volts DC
Pin 2 +
Pin 3 +5 volt return (ground)
Pin 4 +5 volts DC

12

volt return (ground)

FIGURE

2-5 DC Power Connector (12)

SCSI CONNECTOR

CABLE

CONNECTORS

of

1-

One SCSI cable connector
in

Section 4 - SCSI Interface.

Connection to
2-6. A key slot is provided to prevent incorrect installation
mating connector for
strain relief),

NOTE: Un keyed mating connectors should not be used due to the possibility

11

is

or

equivalent.

backwards.

(JI)

is required for the ProDrive. Details

through a 50-pin Universal Header connector. A connector sketch is shown

of

11

is AMP receptacle

~~~~",=""="~~=-=-=~~",=,,,,=,,"',=,,-,=,,,,-POSITION

aaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaa

FIGURE

PIN

1-499508-2 (with strain relief) or PIN

2-6

SCSI

Connector

of

the signals required can be found

the mating connector. The recommended

(11)

in

1-746195~2

of

plugging the connector

#1

INDICATOR

Figure

(without

in

2 - 6 Installation

and

Operation

Section 2

Installation and Operation

2.4

2.4.1

Configuration
This section describes the user-selectable hardware options that should be set prior to installation. Figure
2-7 identifies the location
these options. In addition to the optional hardware configurations described below,
can also be affected by many optional features controlled by individual

information about the

J2

DC

CONNECTOR

OPERATION
GENERAL

of

a ProDrive disk drive varies depending on the system

of

SCSI commands.

PROCEDURES

shorting plugs and terminators on the Printed Circuit Board which control

SCSI

TERMINATORS

in

which it is to be installed.

ProDrive operation

SCSI commands. See Section 5 for

MICROPROCE

SSOR

BACK

DRIVE

OF

o

EPROM

JUMPERS

SCSI

CONNECTOR

FIGURE 2-7 Shorting Plug/Terminator Locations on the PCB

(1)

FACTORY TEST

CONNECTOR

FACE
SIDE

PLATE

Installation and Operation 2 - 7

Section 2

Installation and Operation

2.4.2

The self seek test continuously exercises the actuator

installed, the drive will perfonn random seek patterns, verifying target IDs after every seek. The pattern
will repeat as long as power

ProDrive is sent from the factory

The

2.4.3

Shorting plug
checking
although parity is still generated.

ProDrive is sent from the factory with shorting plug

The

2.4.4

The

WS shorting plug controls the Wait/Spin option. When this plug is installed, the motor will not
spin upon power-up
permits power sequencing
demanding peak start current at the same time.
will be ready within
start spinning upon power-up

ProDrive is sent from the factory with the WS plug not installed (Wait/Spin option disabled).

The

SELF SEEK TEST OPTION

is

applied to the drive

with

shorting plug SS not installed (Self Seek Test disabled).

ENABLE PARITY OPTION

EP

controls the checking

of

data across the SCSI bus is enabled. With

of

parity across the SCSI bus. When this plug is installed, parity

WAIT SPIN OPTION

or

reset until the host sends the START/STOP command across the SCSI bus. This

so

that the system power supply will not be overloaded by many devices

Once the START/STOP command is received, the drive

15

seconds. When the WS shorting plug is not installed, the motor will automatically

or

reset and be ready within

of

the drive. When shorting plug option SS is

or

until an error has occurred.

EP

removed, parity checking is not performed,

EP

installed (Parity enabled).

15

seconds.

2.4.5

The SCSI bus can support up to eight devices including the host system. The identity number determines
the priority level
the ProD rive prior to installation.

Three shorting plugs (A2,
comprise a 3-bit binary number in which A2 is the most significant bit and
Installation represents
shorting plugs installed, the device identity is

The ProD rive is sent from the factory with plugs A2 and A 1 installed (device 6).

2.4.6

The green
It lights at the beginning
The LED remains on even when the drive is disconnected from the initiator during a command.

2.4.7

The ProDrive contains three resistor networks, in sockets, to terminate the SCSI bus. The location
these terminators is shown in Figure 2-7. Section 3.2.2
terminators.
SCSI bus should contain the terminators. When a ProDrive is used in a position

the first

SCSI

of

BUS

each device, so careful consideration must be taken in choosing the identity number

Al

aI,

DEVICE IDENTIFICATION

and

AO)

shown in Figure 2-7, are used for device identification. These plugs

AO

is the least significant.

meaning that with all shorting plugs installed the device identity is

O.

FACEPLATE LED OPERATION

LED

located on the ProDrive's faceplate illuminates when the drive is executing a command.

of

a command and does not go

off

until the command is completed or aborted.

DRIVER TERMINATORS

of

the manual describes the function

It

is important to note that only the first device (usually the host) and the last device on the

on

the bus

or

last, all three

of

the terminators must be removed.

7.

of

these

other

of

With no

of

than

ProDrive is sent from the factory with the terminators installed.

The

2 - 8 Installation and Operation

PRINCIPLES OF

SECTION 3

OPERAtiON

3.1

The drive mechanism consists

These subassemblies

Figure 3-1.

ProDrive

are

40S/80S DRIVE MECHANISM

of

the mechanical subassemblies which are sealed under a metal cover.

not

adjustable

nor

are

they field

repairable.

Please refer to

FIGURE

3·1

ProDrive Exploded View

PrinCiples

of

Operation 3 • 1

Section 3

Principles

of

Operation

3.1.1

The base casting is a single-piece cast aluminum alloy which provides a mounting surface for the rest
drive mechanism.
assembly. A gasket is mounted on the outside top edge to ensure a seal with the metal cover. Surfaces are
provided for mounting the magnet plate assemblies for the rotary positioner assembly, and a read/write
preamplifier. Mounting holes are provided outside the cover area, for the PCB and shock mount bracket
assembly. .

3.1.2

The disk stack assembly is secured to the
of

disks, disk spacers and a disk clamp. The
assembly, disk mounting hub, and ferro-fluid magnetic seal. This seal prevents outside air from entering
the drive through the bearing bore
spacers are placed
disks are an aluminum alloy with a thin film magnetic metal coating which is lubricated using a carbon

overcoat. This overcoat prevents head and media wear when the heads are in contact with the disk surface,

which only occurs outside the data area.

3.1.3

The positioner used

magnet plates, a rotary single phase coil, a headstack mounting hub, and a bearing shaft. The magnets are

composed
casting. The rotor and hub are molded together. The shaft is pressed into the base casting. Crash stops

mounted to the magnet plate assembly prevent the heads from being driven into the spindle
surface.

BASE CASTING ASSEMBLY

It

has two machined holes for mounting the motor/spindle assembly and the positioner

DISK STACK ASSEMBLY

DC

spindle motor which is bolted to the base casting.

DC

motor assembly consists

or

along the bearing shaft. In the ProDrive 80S, three disks and two

on

the hub and clamped in place; the ProDrive 40S uses two disks and one spacer. The

of

a DC motor, spindle bearing

ROTARY POSITIONER ASSEMBLY (ACTUATOR)

on

the ProDrive is a Quantum proprietary design. It consists

of

two alternating poles bonded to the magnet plates which in tum, are bolted to the base

of

the upper and lower

or

off

of

It

consists

the disk

the

3.1.4 HEADSTACK ASSEMBLY

The headstack assembly consists
and the rotary positioner assembly. It is designed such that the mass center

of

center
design in which the head arms, optical scale, and rotary positioner coil assembly balance each other. The
heads are mini-composite slider type heads. They are mounted to Whitney-style spring steel flexures which
are screwed to the head arms. The head conductors are flex cables routed through one flex circuit. A read
preamplifier/write driver is mounted to this flex circuit.

3.1.5

The optical encoder assembly consists
optical reticle, a multi-cell photo diode matrix, and a flex circuit.

The infrared LED and the mirror are mounted in the upper portion

scale mounted with the headstack to move between the mirror-reflected light from the infared LED and the

lower portion

so that each cell only

angular position

the mounting hub. This is accomplished without the need for external counterbalances through a

OPTICAL ENCODER

of

the housing which contains the reticle and photo cells. The reticle masks the photo cells

rece'ives light through a specific portion

of

the reticle and scale are precision adjustments made when the drive is manufactured.

of

the read/write heads, head arms, spacers, flex circuit, an optical scale,

of

the entire stack is at the

of

a housing, an infared light-emitting diode (LED), a mirror, an

of

the housing. This allows the optical

of

the movable scale. Both the clearance and

3 - 2 Principles

of

Operation

Section 3

Principles

of

Operation

3.1.6

The ProDri,'e uses a dedicated landing zone to ensure data integrity and prevent damage during shipment.

It also uses AIRLOCK@. Quantum's patented means

AIRLOCK consists

actuator to hold the headstack in the landing zone whenever the disk is not rotating. As DC power is

applied to the motor and the disk stack starts rotating, an airflow is generated around the disk. As airflow
increases with disk rotation, the airvane and its
landing zone. When DC power is removed from the motor, an electronic return mechanism automatically
pulls the actuator into the landing zone so the

3.1.7

The

ProDri~e

surface.

end

of

this sentence.

It is absolutely essential that the air circulating within the drive
drive is assembled in a Class 100 purified air environment, then sealed with a metal cover. During the life
of

the drive. the rotating disks act as an air pump to force the air through an internal filter. Figure 3-2

shows the air flow in the enclosed area

The lowest pressure area within the drive is at the top in the center
filter is bonded in this area
equalize internal and external pressures. The highest pressure area within the drive is located at the outer

of

edge
this location. Air is pumped continuously into the side
disks, is filtered, and exits from the side
Since this area
filter. This setup ensures a continuous flow
stringent cleanliness required, the cover and seals should not

the disk. Another 0.3 micron filter called the circulation filter is mounted to the base casting at

AUTOMATIC ACTUATOR LOCK

of

locking the headstack in the landing zone. The

of

an airvane mounted close to the edge

ann

rotate. enabling the headstack to move freely out

AIRLOCK can hold it

of

the disk stack with an

in

place.

ann

that intersects the

AIR FILTRATION

Series drives are Winchester type drives and. as such, the heads fly very close to'the media

The

nominal flying height is 8 microinches - more than 2500 times smaller than the period

of

the drive.

of

the cover. This filter allows outside air into the sealed area

of

of

the filter facing away from the rotating direction

of

the drive is at a lower pressure than at the edge

of

filtered air as soon as the disks start to rotate. Due to the

be kept free

of

the filter facing the rotating direction

of

the disks, air will circulate through the

be tampered with.

of

particles.

the spindle. A 0.3 micron breather

To

of

the drive to

of

of

the

at

this end, the

of

the

the disks.

the

FIGURE

3·2

Air

Filtration

3

MICRON

FILTER

CIRCULATION

Principles

of

Operation 3 • 3

Section 3 Principles of Operation

3.2

3.2.1

All drive electronics, including SCSI controller functions, are contained on one Printed Circuit Board
Assembly (PCBA). This is accomplished through advanced circuit design and the use
mounted devices and proprietary
PCBA are the preamplifier chip for the read/write circuitry, and the electronic circuitry for the optical
encoder photocells and infared LED; these are located under the drive cover. The preamplifier is mounted as
close to the read/write heads as possible to improve the signal-to-noise ratio. The following paragraphs
provide operation details for major functional

3.2.2

At power-on and at other predetermined times, wedge data on the inside and outside tracks is read by the read
channel for each disk surface. This analog data is converted to a digital value by an on-chip
on the microcontroller. The controller uses these values to calculate the slope
error line from outside to inside
internal temperature and a time mark. New values are read and the slope
temperature and/or time exceeds a predetermined value. When seeking, signals P I and P2 from the optical
encoder are used to determine track crossings.
track, the position error for that track is applied, and the head settles to the center
Signals
Differences between the reference position and the position indicated by
from the pulse width modulator. This signal is converted to an analog form and applied to the actuator
driver, causing the actuator to move the head back onto the desired track centerline.

PI

ProDrive

40S/80S DRIVE ELECTRONICS

GENERAL DESCRIPTION

of

miniature surface-

VLSI components. The only electrical components not contained on the

circui~s

within the drive.

HEAD POSITIONING SYSTEM

AID

of

the expected track position

of

each surface. These values are stored along with the current HDA

is

recalculated whenever the

Once the actuator has positioned the head close to the desired

of

the proper track.

and P2 are monitored and compared with a reference position to hold the head on track.

PI

and P2 will result in an output

converter

Figure 3-3 provides a block diagram

of

the head positioning electronics.

MICROCONTROLLER

FIGURE

3 • 4 PrinCiples

of

Operation

3-3

Head Positioning Electronics