Iomega ALPHA·10H, ALPHA·10.5H Technical Description Manual

'1I-~.A®

-

l

-N':"'4

TECHNICAL
DESCRIPTION
MANUAL

OEM DISK STORAGE SU'BSYSTEM

AlPHA-10H/10.5HW'TH

IOMEGA Corporation 1821

NOVEMBER 1984 00701300-000

EXTENDED

West

4000 South Roy, Utah 84067

SCSI

,--

________

FCC

WARNING

This equipment generates, uses,
dio

frequency energy

in

accordance with
cause interference
been

tested

and

found

and

if

not

this

to

radio communications.
to

instruction

comply

a Class A computing· device pursuant

Part

15

of

FCC

Rules,

which

'are designed

reasonable protection against
operated in a
this

,equipment
cause interference in
expense will
may

be

required

commercial

in a

be

required to take whatever measures

to

correct

environment. Operation

residential

which

case the user

the interference.

________

and

can

installed

with the

to

sucb

interference

area

radiate

and

manual,

It

limits

Subpart J

to

provide

is

likely

at

his

----...

ra-

used

may

has
for

of

when

of
to

own

This
Information
be superseded in
guarantee,
accuracy

Normal
powered equipment should
Never
power
for
use
ual.

manual

expressed

or

precautions

work

source

incidents

of

on

this

is

completeness

is

subject

current

future

the

Di

activated.

resulting

equipment or'

as
documents.

or

impl

used in handling

sk

to

change without

of

publication,

IOMEGA

ied,

of

the

be

Storage Subsystem with

IOMEGA

from

inaccuracies

with 'regard

material.

followed

assumes

careless

electrically

at

no

in

notice.

but

makes

to

all

times.

liability

or improper

this

may

no

the

the

man-

ALPHA·10H

DISK STORAGE SUBSYSTEM

WITH

EXTENDED SCSI

i10.5HTM

OEM

1821

TECHNICAL

DESCRIPTION

MANUAL

December 1984

Iomega Corporation

West

4000

(801)

South Roy, Utah 84067

776-7330

-

00701300-000

PREFACE

This' Techni'c'al' Des'criptl0n'

ing of a 10/10.5 megabyte, 8 inch disk storage subsystem,

by

IOMEGA

ler,

up

tridges.

sign of

disk,

low

cost

This

document

as

Alpha-10H/10.5H

to

two

disk

Through

its

drive,

the

flexible

the subsystem

Winchester-like performance

flexible

media. .

provides

Manual

m

drives,

original

provides info.rmati'on for'

•

The

subsystem

and

removable 10/10.5

magnetic disk

offers

and

reliability;

equipment manufacturers

consists

of a control-

megabyte

media

and

the unique de- .

the advantages of (1)

and

(2)

o·

source of information useful in understanding the function
ation
lowing

of

the subsystem.

descriptive,

•

SECTION

1.0,
of the subsystem
physical
ance

•

SECTION
and

specifications,

2.0,

the hardware

essential

•

SECTION

3.0,
cartridge
tification

Specifically,

interfacing,

and

General 'Description, includes

and

provides

characteristics,

and

Interface,

and

for

normal

host-to-subsystem

principles

special
contains information regarding

software

the

manual

operational

an

overall description of

of operation, perform-

features.

interface.

SCSI

includes the

information~----

an

introduction

This materi
interfacing.

Operational Information, includes techniques of

use, a description of operator

of cabling

and

connections.

controls,

interfac-

identified

car-

rigid

removable,

(OEMs)

and

oper-

fol-

its

SCSI

al

is

and

iden-

a

•

SECTION
tions
quirements,

•

APPENDIX
byte, 8 Inch

provid~s'error

•

APPENDIX

4.0,

for the

and

A,

Diagnostic Port Error

B,

Interconnect

.controller Options, explains the available

controller,

Di

code

cable information for

Reference to
the

new

text

cover

of

and

IOMEGA

this

foreword,

or

manual

00701300-000
15

December

11

1984

operating

principles,

operational impact.

Codes

sk

Storage Subassembly with Extended

for the 10/10.5

information for the subsystem.

Cable

interfacing

its

Alpha-10H/10.5Hm product

to allow the

directly

to the ultimate

Ordering Information, includes

with host

OEM

to pass the

end

and

user.

interface

power

is

not

document,

op­re-

Mega­SCSI,

supply.

made'

with

in

CONTENTS

Page

1.0

·1.4.2.2.4

GENERAL

1.1

1.2

1.2.1

DESCRIPTION

OVE~VIEW

.,

PHYSICAL/MECHANICAL

Function

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

OF

SUBSYSTEM

FEATURES

CHARACTERISTICS

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

1.2.2 Drive Characteristics

1.2.3

1.2.4

1.3

1.4

1.4.1

1.4.1.1

1.4.1.2

1.4.1.2.1

1.4.1.2.2

1.4.1.2.3

1.4.1.2.4

1.4.1.2.5

1.4.2

1.4.2.1

1.4.2.1.1

1.4.2.1.2

1.4.2.2

1.4.2.2.1

1.4.2.2.2

1.4.2.2.3

Controller Characteristics

Cartridge Characteristics

SUBSYSTEM

PRINCIPLES

Drive

Cartridge
Drive Interface

BLOCK

OF

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

DIAGRAMS

OPERATION

Format

•.•..•••....•...••.....••...••.••..•

Board

Preamp

Section

•......•...............•.•.....•....

Write Current Driver Section
Motor

Speed

Control Section
Operator Interface Section
Actuator Driver Section

Controller

Analog

Read

Servo

Digital Section

Mi

croproces sor C i rcu i

Servo

Board.~

Section

Channel

Error

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

••••••••••••••••••••••••••••••••••••••

Decoding

Control

•..•..•....................•........

•...............•........•...........

•...........••••...•..••.•.••••..•.•.

Interface Circuitry
File Control Circuitry

1.4.3

1.4.3.1

1.4.3.2

Interleaving

Interleaving

Error Correction

and

Error Correction

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

·

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

•......

0...................

','

.....•..•.••.•..•..••

••..•••••.••.•...•..•...••.•••••

•.•.••••....••..•••••...••••

.••••....•...•..••..•....•.••

.........••.........•...•..•....

..•...•..•...•....•.•......•...••

....•.....•....••......••..•...

......•.•.......•.....

......•.•.•.••••....•••

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

...............•.•.........

.•.•..........••.••...........

try

.........••.••........•.•.

...•.•.•.••..•..•...•..•••...•.

.......••......•••....•.....

Code

.....•..•...•.

Code

.......•.•.•....•....•.......

~

.

1-1
1-1
1-2

1-2

1-2
1-3
1-4

1-4
1-6
1-6

1-6
1-8
1-8
1-8
1-9
1-9
1-9
1-9
1-9
1-9
1-10
1-10
1-11
1-11
1-11
1-11
1-12
1-12
1-14

1.5

1.5.1

1.5.2

1.5.3

1.5.4

1.5.5

1.5.6

1.5.7

1.5.8

SUBSYSTEM

Capacity

Performance

R e 1 ;

Env; ronment

Power

Phys;

Organ;

Record;

SPECIFICATIONS

...............•...•.............

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

.•..•.......••..•........

ab

i 1 ; t y

••••••••••••••••••••••••••••••••••.

cal

zat i on

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

•••••••••••••••••••••••••••••••••••••••

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

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

~g

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

-

•...•....•...•....

~

••••••••••••••

15

December

1-15
1-15
1-15
1-16

,

••••

1-16.
1-17

.

1-17
1-19
1-19

00701300-000

1984

iii

Co.NT~NTS

(cont)

,

2.0

INTERFACE

2.1

, 2

~2'

~

.'

t ' •

..

..

2.2.1

2.2.2

2.2.2.1

2.2.2.2

2.2.2.3

2.2.2

..

4

2.2.2.5

2.2.2.6

2.2.3

2.2.4

2.3

203.1

203.2

2.303

2

..

3.3.1

2.3.3.2

2.3.3.3

2.3.3.3e1

2.3.3.3.2

2.3.3.3.3

2.3.3.3.4

2.3.3.3.5

2.3.3.3.6

2.3.3.4

2.3.3.4.1

2.3.3.4.2

2.3.3.4.3

2.3.3.5

2.3.3.6

2.3.3.7

2.3.3.8

2.3

..

3.9

2.3.3.10

2.3.3.11

2.3.3.12

2.3.3.13
2'.3.3.14

2.3.3.15

2.3.3.16

2.3.3.17

2.3.3.18

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

SMAll

'HARDWA'RE·)NTERFACE'

.

SCSI

COMPUTER

.:...

.

..

.

'.

~.........,

'B

u s Line s • . • . • • • • • . • • • . • • • • . • . • • • . • • . • • • • . . • • • • • • • • • • • 2-1

Host

Interface
Selection
Command
Data

Transfer
Ending
Busy

Status

Abort Sequence

Res

e t

eo

n d i t

Electrical

SOFTWARE

Command

Structure
Logical Block Addressing
Command

Description

Test Unit
Rezero Unit
Request Sense

Regular Sense Data
Extended Sense Data
Extended Sense Plus Error Class

Z-Track Data

Sector

Flaqqed Track

Format Unit

Standard Implementation

Extended Implem.entation

Device-specific

Format Track

Reassign Blocks

Read

Data

SYSTEM

•.•••.••.•••• ' •••• , .••...

'.'

~...

Protocol

Sequenc~

Tt"ansfer

Sequence..............................

Status

Transfer

Transfer

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

ion.

• • • • • • • . . • .'. . • • . • • • • • • • • • • • • . • . • • • • • • • 2 -9

Requirements

INTERFACE

••••..•••••••••.••••••••••••.••.•••••

Ready

Command

Command

Command

and

ID

Data

•••.•.••..••..•••.•.•...•.••.•••••••
listing

Command

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

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

Command

INTERFACE

..

..'

.

-.

....

(SCSI)

-"...

.••.•..••.•..••.••

..'

, ••••.

"."

.

.'..

~,

••.•.•.

. .

..

.

•••••••.••.••.•.••..••.•.••••••

•••.••••• ~ •••••••••••••••••.••••••

Sequence...........................

Sequence

Sequence

••••••••••.••.

••.••••••.•••.•..•.••

•••••••••••••••••••••••••.•••••

••••••••••

.....

·•••••••••••••.•••••••••

e,.........................

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

.••.••••••••••.•••••.•••••••.•

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

...•.•.•••...•.•••••••...•••••.

••.••.

Current Track

~.

. . • • • . • •

••.

and

Code

Number

•••

.•

.••.••••••

•••.••••.•.••

•••.•..••••••••.•••••••••••••

..

o

•••••••••••••••••••••••••••••••

...........

.•••••••.

c

••••••••

OG

e.................... 2-20

Implementation.....................

•••••••••••••••••••••••...•.••••••.

~

•• :

~

..

~

••••••

•• ••

••••••

Wr i te D at a Command..................................

Seek

Inquiry
Start/Stop
Send
Prevent/Allow
Read
Extended

Extended Write
Write
Read

Command

••.•••••••••• ' •••••.••••••.••..

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

Command

Diagnostic

Capacity

Read

and

Verify

Long

Command

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

Command
Media
Command
Command

Command

Command

•••.•••••••••••••••.•••••••••

Removal

Command

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

••••

0

•••••••••

•••.•••••..•.••.••.•..••.•••••

•.•.•.••.•••••••....•..•.•.•

•.•••.••..••.••.•....••.•..•..•.••.

'..........

'...............

..••..........•..

0 0

•••

,.

• • • • • • • •

2

..

1

2-1

.'

•.

,2~.1.;

.

..

2-4

2-4

2-5
2-5
2-7

~.

2-8
2-9

2-9
2-10

2-10
2-11
2-12
2-12
2-12
2-13

~

2-14

•.

• 2-14

2-15
2-15
2-17
2-18
2-19
2-19

2-'21
2-24
2-24
2-25
2-25
2-26
2-26
2-27
2-28

2-28

2-29

•••

2-30

2-30

2-31

2-31

2.4

POWER

INTERFACE

00701300-000
15

December

1984

1v

•....•..••...•...

~

.•....••.•............•

2-32

CONTENTS (cont)

Paqe

3.0

..

.

OPERATIONAL

3.1

~

..

3.1.1

3.1.2

3.1.3 Write Protect

3.2

3.2.1

3.2.2

3.2.3 Indicators

3.3

3.4

3.4.1

INFORMATION...........................................

CART.RIDG~

Loading

Handling

.~S.E.:.

and

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

'

.• ~ . ~ ..... ' .............. ~ ... !

Removal

•..••.•....•........

OPERATOR

Stop
Load

CONTROLS

Button
Lever

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

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

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

STARTUP

CABLES

Host

DIAGNOSTICS

AND

CONNECTORS

Interface

3.4.2 Drive Interface

3.4.3

3.4.4

.Power

Cable

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

DiagnostiC Error Display Port

3.4.5 Drive Addressing

3.4.6 Controller Addressing

•.••.•.••

'

.••.•••

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

_

....• ~ ...•..•....••.

......... · ...................

0........... 3-3

.....••••.........•......•.......••••

.•••....•.•••..•.......••..•.•..•..

Cable..................................

Cable

•.•..•.•.•••••••••..••...•.•..•••

.•.•.•.•.......•.••..•..•

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

and

Option

Selection

.....•......

~

••••••

3-1

,

..

3~1·

3-1

3-2

3-3

3-3
3-3
3-3

3-4
3-5
3-5

3-6
3-6
3-9
3-10
3-10

4.0

CONTROLLER

4.1

4.2

--

APPENDIX

--

APPENDIX

OPTIONS

ERROR

ARBITRATION

CORRECTION

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

CODE

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

•.•••.•••.. · .•............•....••.................

A - Diagnostic Port Error

8

Inch

Disk

B - Interconnect

Storage

Cable

Codes

Subassembly

for the 10/10.5

with

Extended

Ordering Information

Megabyte,

SCSI

.•.............

....

4-1
4-1

4-2

A-1

B-1

00701300-000

15

December

1984

v

.

."

ILLUSTRATIONS"

Figure

,I. ,

The.l0/10.5,)~1egabyt,e,

.

,"

,"

.

~

"Sub.sys.t.~m·

'2'

Ofsk

3

810ck

4

Block

5

Block

6

Disk

7 Sector Format

Dri

D i agr
Diagram
Diagram

and

....

vel

Contro

am

Track Formats

8 Servo Signals

9
10
11
12
13
14
15
16

17

18

19

20

21

22

23

24
B-1
8-2

Example
Drive

'Sample

J1

Host
Select
Data Transfer Sequence
Ending
Hardware

Host

Z-Track

Sector

Cartridqe with Write

Printed

Cabling

DiQital

Recommended

Host

Power

of

Interleave

Mounting

SCSI

Interface

and

Command

Status

Busy

Adaptor

Format

Interleaving

Circuit

and

Controller

Interface

Cable Harness

8-3 Error Readout

~a1.f

,.Height

e'

~ : "~

•

"~'

e

_.~"

...

~,

....

11

er

Arch

i te'cture

of the Subsystem

of

the Subsystem

of the Subsystem

:,

~

e

""!

......... ' •••

Dri
Analog
Digital

8.

Inc~

~,.

..•....

ve

•............

Functions

Functions

'o,i.s~

,

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

~

.....

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

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

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

40

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

Hole

Locations

Configurations

Connector Pinout

Sequence

Timing

Transfer

Timing

Status Transfer

Bus

Termination

...•.................•.•........

•....••...•......•...............••

..•.....•.•......•....•..•.

Timing

..•.•...••.•.....••

.••..•.••....••..••..............

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

Timing

••......•..•.............

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

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

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

Protect

Board

and

Connectbr Requirements

Terminations

Ground i ng

Cable

•....• : •......

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

Switch

Main

..••.....•..••.....•.•....

Cable Locations

..•.•. : •..•...

and

Address Options

'. . • . . . . . . . • . . . . . . . . . . . . .

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

Assemb

ly

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

Sto,ra.ge

~

.•

~ . ~

'.~'

'.

..

. . . . . . .

.

,-

... ' ....

..•.........•.

•..........••

~

..••.•.

........•....•.

L

••••••••••••

.....•....

Paqe

----

....

~

"

••

;,

1.:-1

"1-3

•.

1-4
1-5
1-5
1-7
1-8
1-10
1-13
1-18
2-2
2-2
2-5
2-6
2-7

2-8

2-10
2-16

2-17
3-2

3-6

3-7
3-8

..

3-9

B-2
B-2
B-3

Table

1

Maximum

A-I

Error

8-1 Cable Connector

Power

Requirements with Controller

Codes..................................................

Identification

00701300-000

15

November

1984

vi

TABLES

..•......••........

•.....••..........•..•.........

Page

2-32
A-7

B-3

1~OGENERAL.·

The

10/10.5 megabyte, ha·lf height 8 inch disk storaqe subsystem (Fiqure

is

a high capacity, high performance,

ing

flexible
(SCSI),
line
system
up

to

is

intended for

storage

consists

two

disk

'DESCRI"PTION

media.

with· removable

of a

d~ives

The

use

controller

attached daisy-chain

direct

subsystem, with

wi~h

small to

cartridqes

with

an

·of 10/10.5· megabytes each. ··The sub­intelligent

access data storage device us-

Small

medium

style

Computer

System

sized systems requiring

host level

to the

controller.

interface

1)

Interface

on-

and

Figure

1.1

The

make

tures

1.

The

10/10.5

OVERVIEW OF SUBSYSTEM FEATURES

subsystem incorporates a

it

a very

described in

Drive

•

•

•

•

•

•

and

One
Removable,
Embedded
Run
Use·r
Utility

versati

this

Controller

or

two

drives per

10/10.5 megabyte data

servo

length limited

transparent

commands

• A 1.13 megabyte/sec instantaneous

Megabyte,

le

and

Half Height 8

number

of

adaptable data storage peripheral.

section include:

controller.

control.

code

error

for sector

(RLLC)

detection

and

new

Inch

and

innovative technologies

Disk

cartridge.

encoding/decoding.

and

correction

track sparing.

transfer

rate.

Storage Subsystem

The

(optional).

00701300-000

15

December

that

"fea-

1984

1-1

;

•.

Sector

•

Data buffering

interleave

on

'capabfl ity·.

the

controller.

• Logical block addressing. .

• Comprehensive user

• Automatic

•

Au~omatic

.'

Ali

t'om

,

•

':

Autc)matt'c

•

High

•

All

at

level,

direct

startup
idle

i c

;'med

i.a" " if

'e,rrbf'.'

intelligent

current (dc)

command

set.

diagnostics.

drive

e .

half
enh

aricemenf

speed

recovery procedures>

host

interface.

power.

dwell. .

'rout i

nes ' ..

,,'

Data Cartri

•

Hard

dge

plastic

enclosure for

media

protection.

• Preformatted media.

• Convenient 8-1/2 X

11

in.

size.

• Cartridge write protect switch.

• Maintenance tracks for

cartridge-specific

tics.

A

more

teristics

1.2 PHYSICAL/MECHANICAL CHARACTERISTICS

Subsystem function
characteristics

1.2.1

The

controller
storage
storage capacity per subsystem.
the

complete description of subsystem functions

is

presented in subsection

Function

subsystem

is a hi

and

capability

assurance qf

and

operation are described in

of the drive,

gh

performanc.e

up

to

two

controller,

drives,

to systems requiring

drive-to-drive

compatibility.

1.2.

and

di

sk

storage devi ce.

the subsystem provides removable

up

to a

Data

cartridges

cartridge.

total

are interchangeable, giving

information

and

performance charac-

this

subsection,

Confi

of

20

megabytes online

and

diagnos-

as

gured with a

media

are

Major
data

S,

drive

functions of

transfer,

nee

these func.t;

is

installed

the.

subsystem include disk

host

interfacing,

ons

are

in the system, routine operation

quiring operator intervention only for

1.2.2 Drive Characteristics

The

subsystem drive contains
casting,
and
ampl

ifiers

architectural

00701300-000
15

December

drive motor, Bernoulli

some

electronic

for the head/actuator

division

1984

circuitry

of the drive

1-2

and

hand1

ed

error

-by

identification.

the subsystem contro

cartridge

all

function-a1 mechanical

plate,

head/actuator,

(read preamplifier write

and

drive motor). Figure 2

and

controller.

rotation,

is

fully

exchange.

and

head

positioning,

11

er;

automated,

components

loading

mechanism)

driver

once

and
shows

the
re-

(base
power

the

HOST

TO HOST

POWER

(+5, +12VDC)

CONTROLLER

DIGITAL/CONTROL

..

SECTION

CPU

ROM/RAM .

HOST

INTERFACE BUFFER
FILE CONTROL LOGIC
ECC

LOGIC (OPTIONAL)

SERVO

CONTROL LOGIC

ANALOG

CLOCK

CIRCUITS

SERVO DEMODULATION

SERVO

SECTION

AND

DE1ECT

COMPENSATOR

io..--

.....

rpOWER-'

~~gF.!!~

DRIVE

INTERFACE

BOARD

READ

PREAMP

DRIVER

TO

ADDITIONAL

AND

'----

-+l_.

I

WRITE

.....

DRIVE

SPINDLE

DISK

DRIVE

Figure 2.

Disk

Drive/Controller Architecture

1.2.3 Controller Characteristics

The

subsystem

provides the host with

consists

tions

The

controller

of a printed

(see Figure 2).

• Data detection

controller

integrates

an

intelligent,

circuit

board divided

provides the following important functions.

and

clocking.

• Servo demodulation.

•

Command

decode

and

execution.

• Buffering of data.

• Data

serialization/deserialization.

• Data encoding/decoding.

•

Subsystem

• Sector

• Automatic

• Automatic

• Automatic

• Arbitration for host

diagnostics.

interleaving.

idle
error
error

drive

recovery procedures.

correction (optional, see Section

half

interface

drive analog

high level

speed

dwell.

(optional, see Section

between

and

digital

interface.

analog

4.0).

functions

The

and

digital

4.0).

and

controller

func-

00701300-000

15

December

1984

1-3

'.

1.2.4

The
taining
ment
cess

tion

.

. . .

The

....

. Cartridge. Characteristics.

subsystem

a single
for the
door
fnto"the

.....

disk

cartridge

flexible

media

to the

~

;s

media

'drive~

.....

.

~

. . .

a 3

mil

consists

disk.

and

a handy, transportable package for the user.

is

latched

·th4·S.

'.'

pre~entiryg.··any

..

polyester based

of'

a durable

The

cartridge

internally.

coating. Disks are preformatted at the

and

formation, sector

tracks

called the Z-tracks.

track

track boundaries are flagged

identifications,

Raw

media

when

the disks are preformatted

locations are assigned.

A

summary

1.5 of

1.3 SUBSYSTEM BLOCK DIAGRAIYIS

The

block diagrams
subsystem drive (Figure
section (Figure
should not

pre~ented

of

cartridge

this

manual.

5).

be

used

in subsection

and

media

shown

These

as

here represent the 10/10.5

3),

analog section (Figure

diagrams are for informational purposes only

wiring documents. Explanations of the diagrams are

specifications

1.4.

~blycarbonate·

e~c16sure

provides a protected environ-

and

~ser·

. .

'.

....

substrate

factory

opens

co'ntact

.

-'

having a high energy oxide

with servo positioning in-

and

upon

·.~;~h

.

two

prewritten diagnostic

cartridge

the

'disk'

defects occurring within sector

and

is

presented

megabyte

4),

and

in

subsection

hal f

digital/control

c6n-

The

ac-

inser-

i,t'self.··

and

alternate

hei

ght·
and

a::

~

5

CONTROLI

~

z

o

STATUS

u

g

r---------------------------,

I

I

OPERATOR

INTERFACE

I

I

I

I

I

I

I

I
I

!

I

I

I

I
I I

__

L

LO~~T~F~E--I

CONTROL
AND
STATUS

CONTROLLER

INTERFACE

t--.=.:SE:.:..:.RV.;.;:0:-i::A~ND~C~U~RR:.:.::E.:..-NT~

~_R~U~N

- -

_,

Figure 3.

DRIVE

SELECT

COMMAND

__

~~~,

READY

_____________

Block

WR

DATA

CONTROL

_______

AND

SENSE

RD

......

'---

1---7'--"'"

DATA

Diagram

__

---'

~_--:.;.:..:.=~::.:.:....=::o:._

I

__I

of the Subsystem Drive

POWER

AND

HALl·EFFECT

CONTROL

SENSE

__

_

00701300-000
15

December

1984

1-4

·

RD

DATA

rvARimE1!-1!R§EA~D2.Q;DA~T!:!A~

NRZ

READ CLOCK

-I

~ ~

~t

~~

AGC

-I

c(

z·

<.:)

Vi

a:

o

a:
a:

w

z

o

~

Vi

~

PES

PES

WINDOW B

~SA~M~P~L~E~W~IN~D~O~W~

RZWRITE DATA

W~R..:::C.:::.U:.:.R

R:.:,.:E::.:,N;:.,:T..;C::.;:O:.:,.:N:.:,.T.:.:,RO;;,L=---.....

CONTROL

OFFSET

OFFSET

__________________________________

RD

DATA

TO

DRIVE INTERFACE

SERVO

CURRENT COMMAND

~

~~~~~

t>-~~~--------~~~~~--------~

~

>-.JTI~1'-

-I

~~~~~--------~~~~~~--~

a

o

~

a:>-~~~~~~~~~------------------------------------------

u. +ANALOG

________

________

SERVO CONTROL SIGNALS

-ANALOG

Figure 4.

Block

Diagram

of the

RECORDING

Subsystem

STATUS
CONTROL

CHANNEL

CONTROL

LOGIC

Analog

+ANALOG

-ANALOG
STATUS

CONTROL

Functions

PES

OFFSET

PES

OFFS

T

)

Figure 5.

Block

Diagram

of the

Subsystem

Digital Functions

00701300-000

15

December

1984

1-5

1.4· PRINCIPLES OF OPERATION

• •

.'

'"

~

•

T.

•

.'

•

Th e sub

its

sections.

system

associated

Figures 3 through 5

can

electronics

parts.

1.4.1 . Drive

The

drive (Figure
write head,
cators.
move

ator

the head, preamp1ify read data, control data
interface.

actuator,

The

major drive functions are to provide a constant spindle speed,

When a cartridge
spindle motor
speed.
plate
head,

As

on

a cushion of

which
lish a stable
interface
It

also
gre.en
the drive

board senses

signals

LED

during spinup/spindown,

when

is

the

di

penetrates through

recording environment.

the motor

be

3)

is

inserted

engaged

sk

rotates,

the

controller

brok

en

and

consists

drive

interface

and

air.

Special coupling techniques allow the read/write

motor

is

up

fu

ncti

on

all

y into th ree part s: the

the

controller

show

the functional segments of these major

of the Bernoulli

board,

and

the load lever is. turned clockwise., the

the disk spins

it

"f1 ies" in close proximity to the

an

opening in the Bernoulli

Motor

speed

and

that

and

keeps the

the disk

lights

board with analog

plate,

and

operator controls

writes,

up

control

motor

is

up

the green

spindle motor, read/

and

to a constant operating

circuitry

turning at

to speed, flashes the

LED

to speed.

dr

i

and

and

provide oper-

Bernou11

plate,

to estab-

on

the drive

1,500

on

the front of

ve

wi

th

digital

indi-

rpm.

i

If

the

di

sk

is

not accessed. over a peri
drive
or

prevent s the dr i

either

begins a steady

adjusts the motor to

ve

from

half

dwell i
time before the motor spins
Z-tracks.
causes the

When

motor

the

controller

to spin again to

track-to-track

speed

ng

on

down

to

accesses the disk

od

'of time, a timeout occurs

seeking action (drive

(dual drive configuration only). This

one

tr

ack

half

full

exces s i

speed

can

speed, or

after

ve

1 y.

be

progral1111ed

a timeout,

initiates

track corresponding with the logical address requested

Approximately 1

is

at

1.4.1.1

Data

cartridqes

half

speed.

Cartridge Format

es the user recording surface into

(10.5

Mbyte)

sector

track

Mbyte)

or

two

on

each

formats are

tem's 10/10.5 megabytes of data.

the

normal
are present
(Figure
Z-track

6).
becomes

to

2 seconds are

are preformatted at the

data

sectors.

sp'are sectors (10.5

data

on

The

track,

shown

tracks

each

secondary Z-track

making a total

in

become

di

sk;

damaged.

needed

Each

track also contains five spare sectors

Mbyte)

Figure 6.

Four

damaged

one

at the inner

for the drive to

306

The

factory

data

and

of

70

306

with information

tracks

one

error

sectors per

data

tracks

spare tracks are available

or

unreliable.

edge

and

becomes a backup

The

Z-tracks are used for recording

of

64

correction

Two

one

in

the event the primary

and

the

last

The

used)

1 ength of

onto the

it

either

a seek to the

by

the

command.

become

(10

ready

that

Mbyte)

if

it

divid-

or

67

(10

track.
store

code

the subsys-

Disk

if

(ECC)

and

any

of

identical Z-tracks

at the outer

such

cartridge

edge

00701300-000

15

December

1984

1-6

·

speci.fic'
and

spare

tracks

self~test

matting'

that text

informatfon,"as'

'track

are

us'ed'

of

the

describes

lists,

to . record

the

subsystem,

Z-tracks

and

is

the

sector:'

error

speciflc'

or

special

presented

format.of

inte'rleave~

correct,ion

d'at'a'

customer

in

subsection

the

Z-tracks.).

dwe'll: ti'meout'
.status.

patterns-

required

data.

2.3.3.3.4.

,Some.

'length,:

sectors,

The

defect;-v'e

of

by .

the,

command

(Fi~ure

the

.Z-,

internal"

for

for-

18

in

10 MEGABYTE

Each

sector
provides
allows

sufficient

uniquely

servo

keep

;

ng

data.

field

the

i nformat i

The

sector.
bytes
dressed

Sectors
tors.

per

independently.

may

One
correction
the

Z-tracks)

(see

Section

TRACK

on a track

space
coded

for
sector

allows

head

centered

on

so

sector

A

tot

a 1

data

be

field

flagged

sector

information.

allows

4.0).

Figure

is

sector

recovery

timing

head

on a track.

they

10

of

can synchron i ze

field

512

(also

as

on

each

the

~~=t:~:::...

~iiiiiiiiiiiiiiiii\'~

~-

10110.5 MEGABYTE DISK

6.

Disk

orqanized
overlap

time

if

mark

positioni.ng

identifies

bytes

of

called a record).

defective

track

Use

of

may

the

correction

~~~bRS

G~~~~

SPARE

TRACKS"",

SECONDARY

Z·TRACK

~~~~:~:

.• --OUTER GUARD

BANOS
TOTAL

and

Track Formats

as

shown

(caused

by

switching

identifies

circuitry

Gaps

provide

to

the

sector

dat

a can

and

reassigned

be

used

ECC

sectors

of

two

...

'"

16

4

,.,

••

',...

1

.. ,

..

. .

...

1

".",'".

in

15

343

Figure

motor speed
from
the

start

on

the

the

frequency

and

be

stored

The

two

to

opt

i ona

(optional

complete

write

the

read

track

in

data

one

11 y for

data

10.5

MEGABYTE

7.

The

variations)"

to

read

of

a

sector.

controller

circuits

and

ph

number

each

fields

of

the

stori

and

specified

records

TRACK

PAD

mode. A

board

with

ase

of

of

sector,

can

be

spare

ng

per

field

and

The

to

tim-

the

each

256

ad-

sec-

error

on

track

'

00701300-000

15

December 1984

1-7

·

~.

PAD.---24

VFO._

SECTOR

MARK.

BYTES

.

••••

_12

SYTES} . .

TIMING

__

1SYTE

SERVO

¥~2c::.2~

GAP

FIELD

__

.27

BYTES

:~~S

}

10._4

,

',:~,c_z

BYTES

In

l"\~

"'\:

GAP

}SECTOR

...

,

I.

SYNC--l

VFO

__

ftElD'

17

BYTE
BYTES}

DATA_251

CAC

GAP

BYTES}

___ 2 BYTES'

DATA 1 FIELD

(RECORD

1)

SECTORSITRACl(
DATA

SECTORS

SPARE

SECTORS

ECC

SECTOR

70
64

5

Figure 7. Sector

1.4.1.2 Drive Interface Board

The

purpose of the drive

of

head

output amplification, (2) switch write current to the head, (3) pro­vide motor speed
the

actuator.

control,

interface

(4) service the operator

1.4.1.2.1 Preamp Section

The

preamp
write
tion,

and

low
troller
the

preampl

problems of external

section of the drive

read

level

signals

signals

traveling

from

the

board for Signal processing.

ifier

to

provide primary

interference.

board

interface

to

and

from

head

are amplified

Its

amp 1 ification,

Format

is

to: (1) provide the

interface,

board

is

responsible for

the head.

and

During
sent

on

close proximity to the

thereby reduci

first

and

stage

(5) drive

managing

a read func-

to the con-

head

allows

ng

the

1.4.1.2.2

During a
ed

to

the preamplifier.

signal

to

On-board control

hardware conditions
cuitry

is

Write Current Driver Section

write,

write information developed

Circuitry

switch write current in the head.

circuitry

have

been

constantly enabled for the selected drive.

00701300-000

15

December

1984

1-8

on

the

controller

in the

preamp

section uses the write data

enables write current only

met.

When

not in the write

when

board

all

mode,

is

rout-

software

read

and

cir-

A

single-chip

cation

It

also

..

med1.a.

microprocessor'provides commutation of the mofor phases,

of

motor speed within

controls'

while .:the

the

mq.tor

latch

..

i.s

.spjnnJt1g

limits,

and

pin, solenoid,

•.

:

motor speed control

which

inhibits

unloading

to

1500

of

indi-

rpm.

the

1.4.1.2.4

The

on-board microprocessor' also senses

the

green
pushbutton (which
lates

1.4.1.2.5 Actuator Driver Section

control

Actuator
from

1.4.2 Controller Board

The

the

controller

digital

1.4.2.1 Analog Section

The

main

is

synchronous with
disk,
for

(2)

head

Operator Interface Section

LEO

when

lines

control

controller

initi

and

board

the

that

driver

board

is

motor

ates

interface

to

comprised

section.

purposes

filter

positioning,

of

and

the

the

shape

and

analog

frequency

the

(4) provide servo loop compensation.

is

spinning

motor spindown).

circuits

direct

section

read

with

use

current

of

two

and

data,

the

motor has been loaded,

up

or

down,

It

also monitors

the

controller

the

Servo Current

to

the

actuator.

areas:

are

to

the

(1) provide a read clock

phase of the

(3)

interpret

and

board.

analog

data

flashes

polls

the

and

Command

section

console
manipu-

signal

and

the

that

coming

from

the

servo information

1.4.2.1.1

Read

signed

and

re 1 at i ve

data

signals

to

recover

threshold

strength

During a read
negative
After

peaks

shaping

Read

Channel

are buffered
the

detect

'of

process,

that

and

gain
output uniform pulses
oscillator
synchronous clock
nonreturn

(VFO)

to

zero

phase locks to

that

(NRZ)
decoded, but are in a
digital

section.

original

circuits

the

read signa 1 .

the

read

correspond

control,

for

each

is

used to

·format.

TTL

form

and

shaped through

written

data.

are included

data

the

lines

to

flux

the

peaks are fed

peak

encountered. A

trailinq

transl

At

this

that

can

be

Automatic gain

to

compensate

contain a

reversals

edqe of

ate

the

point

used

the
easily

a'

series

series

recorded

into

the

data

data

of

circuits

control

for

changes in

of

positive

on

peak

detectors

variable

pulses,

pul

ses

bits

by

the decoder in

providing a

into

have not

00701300-000

15

December

de-

(AGC)

the

and

the

disk.

that

frequency

standard

been

the

1984

1-9

·1-

•.

4.2.1.2····

Servo~

Error Decoding

Servo
sector,

data.
N·orma·l

shown:
the

A and B

information,

goes

se.rv·o·

in

through a filter

fields"

Figure

CENTERED

8:.:· · ..

field

av:ailable

are·

wr·itten·

When··the'·

peaks

A

B

ON

indicate

NORMAL

FIELD
FIELD

TRACK

on

and

servo

SERVO

A

B

A

B

A

TYPICAL

~

~

TYPICAL

the

read

'data

gain

..

one-half.
how

TRACKS

SERVO

~

control

code':is,·read,:·the'··re·lative

far

the

PEAK

\

\

SERVO

SIGNAL

lines

process

track·

DATA

ARRANGEMENT

~

AT

off$et.

head

is

TRACKS

\

\

DIFFERENT

~

at

the

similar

from

from a

Ar

HEAD

'begin'ning

to

data

amplitudes

track

POSITIONS

of

each'

the

read

tracks,.',

center.

..

as:·
of

Servo peak

and B peaks

ence

amplitude
ation
time.
network,

If
section

between

circuitry

This

the

PES

will

which

of

1.4.2.2

The

digital
quencing,
lowing,
digital
mi

croproces

writes.

error

controller:

OFF

TRACK

A

FIELD

OFF

TRACK

B

FIELD

detectors

and

the

position

exceeds

the

TOWARD

TOWARD

on

send

indicate

ensures

adjusts

controller

the

amplitude

error

predefined

the

Digital Section

section

data

sor;

encoding

detection,

and

of

the

the

A

,

rAv

Yr--\

Figure

the

results

of
the
that

signal

head

board.

the

controller

and

and

microprocessor

ch anne 1

8.

contro

the

amount

the

peak

position

limits,

decoding,

host

f

•

~

f

r

\

Servo

11

er

to a differential

A

and

and

(PES)

interfacing.

bus,

,

.,

\

,

,

board check

direction

detectors

acts

to

an

performs

servo

wh

~

f

r

\

Signals

B peaks

as

obtain

error

control

bus,

i ch

carri

the

which

,

•

•

..

f

\

the

amplifier.

is

off

are

an

input

minimum

is

reported

functions

for

Two

es

f

~

•

~

amp 1 itude

an

error

track.

turned

to

positional

seek

major

contains

dat a duri

The

signal

Window

on

at

the

compensator

to

the

of

and

buses

data

ng

of

the

differ-

gener-

the

error.

digital

format

track

serve

for

reads

A
whose
right

se-

fol-

the
the

or

00701300-000

15

December

1984

1-10

The: di'gital 'controller'uses"

(one, for

mi

croprocessor.

are explained in

The

microprocessor

only

memory
ry monitors the drive
microprocessor.
field
outputs

The

microprocessor monitors the host

cepts

mand

execution,

tered along the

is

stored, available

file

,control

The

this

(ROM),

The

programmable

status

and

decodes

information to the diaqnostic port.

and
way

an~

funct ions as'soci ated with these three

subsection.

circuitry

random

~ccess

status

microprocessor also monitors

options, controls the

command

and

returns ending

are flagged to the host

to

the host via a

two'

custom

one

..

is

memory

lines

for host, ,interface) ,as

composed

metal oxid'e:semiconduct'or'

of a

(RAM),

and

controls drtve

Z80-A

and

bit

idle

interface,

drive half

recognizes a

parameter bytes, schedules

status

to the host.

and

REQUEST

SENSE

specific

(Mos)"chip's'

,well

major

,as

'components

microprocessor, read

I/O

ports.

This

initialization

switches

speed

that

feature,

selection,

and

control s

Any

errors

error

information

command.

a

Z80A

circuit-

via the

indicate

and
ac-

com-

encoun-

1.4.2.2.2

To

initiate

information

causes the

offsets,

the

Servo Control

a seek operation, the microprocessor introduces position

and

current

head

to

move

the proc.essor

offsets

off

can

tion of the head.

1.4.2.2.3

The

host-to-controller

includes

flop

mode

Interface Circuitry

two

256

so

byte

that

FIFO

data

interface

buffers.

can

data transmitted to the host.

Each

KNQWLEDGE

during the
commands,
lows
host

transfer

(REQ-ACK)

command

the microprocessor enables a

high

speed

interface

between

controller

handshake.

and

status

transfers.

is

presented in Section 2.0 of

into the track following servo loop,

tr'ack.

By

contro,lling the

amount

control the acceleration, velocity,

is

centered

These

be

accepted

and

host

The

microprocessor manipulates the

phase.

During

hardware

A detailed explanation

around a custom

buffers are controlled in a

from

the disk Simultaneously with

is

accompanied

the data

transfer

this

manual.

phase

and

by a REQUEST-AC-

mechanism

description of the

'

of

and

timing of

LSI

chip

READ

error
which

and

posi-

that

flip-

handshake

or

WRITE

that

al-

1.4.2.2.4

The

file

codes

and

compares

File Control Circuitry

control

decodes,

track

circuitry

seri

and

sector

manipulates signals according to

and

gathers

and

reports

is

centered

ali

zes and, deseri ali zes, generates

IDs,

maintains synchronization with the disk,

commands

error

status.

around a custom

received

from

MOS

chip

and

that:

en-

check s CRC,

the microprocessor,

00701300-000

15

December

1984

1-11

The

subsystem uses

, , packed'

host
special

':'

Each"rO"

"tect'iori

the
troller,

an
host,
retries

on

to

disk,

error

but

the

the

code

marks

and

dataar'~a'

'pt.i'rpo·s'es.

are

the data

is

detected, the 'incorrect data

retri

will

be

the host. Optional

a,

run

length limited,code

di

sk.

on

The

and

format requ i red

the disk

,'orf'~he:disk'

encoder/decoder

that

allow

"Th'e"CRC'byt"es','qenerated

appended

and

es

wi

attempted in

to the data.

CRC

are loQical1y manipulated to

11

be

attempted to execute the

ECC

circuitry

normal

also

that

trans

by

the cont

bit

and

byte synchronization.

is··fQri'q~;ed··,by'a·

as

As

the data

wi

operation before

may

be

alluws

1 ates

ro

11

.CRC,

dat~

datarecei

er.

f.ield.·fb.~,:·~rro'r'.:·de~

~o

be

ved

from

It

also detect s

tightly

the data bits' are written to

bits

11

not

invoked (see Section

are read to the con-

check

be

command

error

for

errors.

transferred

correct

status

is sent to

1

4.0).

to' the

y.

the

If

Si

x

Before
compared
tomer data will

A unique
tection

any

read or write operation, the

with

mark

of these

that

is

of the

be

accidentally overwritten or mistaken for desired data.

tarqet

written at several places in
marks

enables the

ID

of the sector under the

sector. This function ensures

file

control format sequencer to maintain
synchronization with the disk.. This sequencer
signals

At

the beginning of

croprocessor. This information

ing to

encoder or decoder.

by

the microprocessor. Serious

1.4.3 Interleaving

A

number
Some
correction option. Interleaving
described in

required

by

the analog

each

(1) enable write

As

of important

of these are data

this

subsection.

sector,

gates,

controller

an

operation

is

used

(2)

set

board.

in conjunction with the format tim­bus

directions,

er.rors occur, they are latched for

and

Error

factors

transfer

errors

Correction Code

control the performance of the subsystem.

rate,

See

will cause the operation to abort.

latency,

and

how

it

affects

Section 4.0 for

each

register

sector

in

turn manipulates control

is loaded

interleaving,

system performance

ECC

impacts.

on

and

that

the disk.

by

(3)

select

later

and

retrieval

the

head

no

the

error

is

cus-

De-

mi­the

;s

1.4.3.1

Maximum
ever, the actual

hardware
interleave

does not

nearly
determines

, Interleaving

data

transfer

rate

and

software plus the interleave

selection

affect

as

much

how

the performance of single sector or' sinqle record
as

quickly the drive will

rate

achieved

can

does

latency, but for

data.

is

Interleaving
ance
the

00701300-000

15

when

working

maximum

December

a system desiqned to achieve the hiqhest possible perform-

with host systems that cannot

transfer

1984

rate

1-12

of the subsystem

by

the host system

is

selected.

dramatically

de~rade

multi-sector

be

ready to

of the disk subsystem.

1.13

meQabytes/second.

is

a function of the host

Poor

choice in the

How-

performance. Interleaving

transfers

bursts,

transfer

transfer

Durinq

the next block of

data

interleaving

as

rapidly

a data read, for

as

,examp'1.e'~:

with

host
Having
have

" trans.fe,rred

be'-on1y

',f'

the'

host'

its

two

256

bytebuffers~

had

emptied

no

place to put the data

one

to complete a

•.

,Under

t2,800

byte·s/sec.

,these conditions!J,the effective·' data,

co'u1

d ' trao'sfer' .dat'a at 250 ,000

would,

of the buffers,

full

revolution

",

read 512 bytes 'of data,:

would

from

this

(40

.

bytes/sec~

be

ready to read the next sector.

the"

and

before the

next sector, the disk then

msec)

before the data could

transfer

rate

drfve~

would

be

wou.1d,

Interleaving

logically

mance

buffer
that
factor

by

is

the logical sectors are physically next to

of 2 will leave

interleave factor

can

minimize

such

loss in performance

(not physically) adjacent sectors.

allowing additional time for the host to

needed

again.

one

specifies

An

interleave factor of 1

sector

the

between

number

of sectors

the next.

This interleaving system

does

not waste disk space;

bering the sectors to optimize performance.

one

revo 1 ut i

tion (see Figure

PHYSICAL

SECTOR

NUMBERS-~

on

wi

11

9).

be

used

as

dat a sectors duri

Thes~

transfer

each

logically

from

Any

sectors

ng

by

leaving

gaps

gaps

,increase perfor-

data before the

(no

interleaving)

other

on

the disk. A

adjacent sectors.

one

logical sector to

it

is

a system of

used

some

as

gaps

subsequent

between

means

The

num-

during

revo

1u---

10

MEGABYTE

Figure 9.

Example

of Interleave

10.5

MEGABYTE

,4

00701300-000

15

December

1984

1-13

Th~

imp6rt~~ce

·tion cannot
i

nterl

possible

eave

interleave

host system.

of

be

overemphasized.

factors

~electing

the

~orrect

Therollowinq

and

the data

rate

value with a data

interleave

factor

listinq

required for each.

rate

equal to or

less

for"

shows

Se 1 ect

than

the applica-

the available"

the lowest

that

of the

""

I nterleave Factor

10

Mbyte

1

2

4

8

16
32

The

values

Inter

1 eave also
command
the

drive begins seeking to the desired
allows six
sector
seek

from
plete.
ing

maximum

10.5

shown

sequence requires approximately 3

sectors

transfers

one

For

this
efficiency

Mbyte

1

2

4

17
34

can

Sector"-

are for

be

18.3

19.4

multi-sector

used

to:"S"ector

Interval

571

microsec

1.14

2.29

4.57

9.14

9.71

msec
msec
msec
msec
msec
msec
msec

if

the

transfers

transfers

msec

sector.

to pass under the read/wr"ite head. Sequential single

can

be

optimized

if

this

track to the next takes about

reason, sectors are

when

crOSSing

skewed

track boundaries.

Mfri

i"

mum

D

afa

Transfer Rate

896,000
448,000

224,000
112,000

(bytes/sec)

56,000

52,700

28,000

26,350

without track crossings.

are not

to

is

taken into account. Also, a

10

msec, or

18

apart

mu

1 t

transfer

This 3

18

between

i-sectored.

and

decode

msec

transfer

sectors,

tracks,

to

provid-

Each

before

time

com-

1.4.3.2

The

subsystem

write

CRC
support
populated with a special
read or write to
ab 1 ed
read
with
to
must

or

and

ECC

update

be

Post-write
This
host

a

verification

still

command

next track (whichever
written
this

be

00701300-000.

15

operation

substantial

December

Error Correction Code

wi

11

support

checking

post-write

and

error'

CRC

checking, but

custom

any

cartridge,

dis

ab 1 ed)

write to

on

th at

cartridges

enabled but will

ECC

information.

invoked,

CRC

setting

the

causes the subsystem to

ensures

~as

has

the data

been

completed, or

available,

comes

on

the track during thiscomnand are readable.

is

one

additional revolution, or

for

multiple single sector

1984

1-14

two 1 eve

correction

chip. Controllers with the

correctly

cartri

with

reject

To

allow write

ECC

that

the write operation

first),

1 s of

error

code

ECC

will

observing the

dge. Contro

ECC

disabled,

write

commands

commands,

status

bit

verify

in case

whenever

any

the

the drive

transfers

correct i on

(ECC).

be

11

ers

All

available only

wi

thout the opt i

and

since

a format of the Z-track

to disabled.

data

on

the disk

was

retries

transfer

verifies

40

msec.

on

opt ions: post-

controller

ECC

ECC

status

will read

it

has

no

option will

after

boards

on

boards

bits

on

(en-

wi
cartridges
capability

write.

successful while the

are required. After

must

that

the

continue

all

the sectors

The

overhead for

on

This overhead

same

track.

the

can

11

t~5:·:·'

. SUBSYSTEM . SPECIFICATIONS

Capacity, performance, rel i
tion,
subsection.

.

M~yte

"

fneftherof

system without loss of user data.

imum

requirements.

1.5.1

and

recordin9

An

or

10.5.

of

67

Capacity

•

User

• Bytes Per Formatted Cartridge

Mbyt,e

these

good

Available (Formatted) Capacity,
Drive

Cartri
Surface
Track

Sector

Record

User
Overhead

Spares Available for

specifications

unused

..

,subsystem. ,

subsYs.terris,~·

sectors

dge

Available 10,027,008 10,497,004

abi 1 ity,

cartridge

on

306

Total 14,106,960

'environment,

for the subsystem are presented in

from

~owever,

a"ca:rt'rJdge .cannot·:be·
tracks

Media

the factory

...

Orlce

In

addition, a

to support the 10.5 megabyte capacity

Flagqing 924,672

power,

can

fi

1 es

h~ve,~een.

cartridge

Bytes

Per:

10

Mbyte

10,027,008'
10,027,008
10,027,008

32,768 .

3,155,280

physical, orga'ni

operate

used:,

in 'the', other

must

512

256

in

either

wri

t.t~,n

have a min-

10.5

10,497,024

10,497,024

10,497,024

34,304

'3,155,280

454,656

14,106,960

on

'

Mbyte

512

256

za-'

this

a

10

it

sub.;

,

1.5.2

Performance

Data

•

•

•

•

•

Transfer Rate
Drive to Controller
Controller

Single

Continuous Records

Seek

Latency (average

Track

St

Time

Mi

ni

mLlTl
Average
Maximum

Spindle

to

(consecutive records over

artl

Stop

to

Host

Record

(including

Speed

Track

Ti

Access

( average)

me

Burst

rotational

(256

(same

settling

Time

bytes)
track)

time)

de

1..ay)

track boundary)

1.13 Mbytes/sec

1.13 Mbytes/sec

896

Kbytes/sec

10

msec

35

msec

75

msec

20

msec

1,500

10.3

SIS

rpm

msec

sec

15

!0.5%

00701300-000

December

1984

1-15

",1'.5.3

' " " Reliability

• Error Rates
Data

Recoverable
Nonrecoverable

'Seek

,

..

"

•

Mean

Time

Drive
Subsystem

•

Mean

Time

To

Between

"

(Drive

Repair

Failures

and

Controller)

1 in
1 in

1-.'i;;.'

10
1012"

10

..

~

':.'

.' .

15,000 hr

8,000 hr

10

bits
bits

6

"seeks"

Oe5

hr

•

Serv-i

ce Life

• Cartridge Insertion/Removal Cycles

1.5.4 Environment

• Operating:
Temperature

Relative Humidity (Noncondensing)
Maximum
Maximum

Wet

Bulb

Temperature Gradient
Altitude­Shock*
Vibration*

Air Cleanliness

Particle

5 yr

10°

to

46°C,

5,000

500 to

26.6°

10

min

115°F

to

C,

80°

12°C/hr, 22°F/hr

To

3048

3 9

m 10,000

for

20

msec

0.85 9 at 5-17

0.25 9

at

17-500

Size (micron) Particles/m
<1.0

<le5
<5.0

4 X

4 X
4 X

7

10

6

105
10

80%

F

ft

Hz

Hz

3

• Storage

and

Shipping

Temperature

and

Drive

Controller

Cartridge

*Each

the
being defined

00701300-000

15

specified

three

December

shock

and

mutually perpendicular planes of the drive;

as

the top,

1984

1-16

Storage

_22°

_8°

50°

vibration level

front,

and

side.

10°

(6

mo)

to

52°C

to

126°F

to

52°C

to

126°F

is

applied separately to

Shipping

_40°

_40°

_40°

_40°

one

(96

hr)

to

to

to

to

0

60

e

140°F

52°C

126°F

each

of

of the planes

-'-R:el

ative'

H'Umfdit}/Jnon'conden'sino}

'10

::to".'

90

"%'

Shock*
Vi

brat i on*

1.5.5 Power

(four drops)

• Voltage (see subsection

V,o

1 tage

5

±5%

12

1:5%

•

Power

(max

continuous

Continuous

1.5

amps

rms

r i

1.5

amps

rms

r i

power

2.4,

Table 1 for

with

pp

1 e

max

with

pp

1 e

max

Max

30

mv

60

mv

Current

consumption tn watts)

details).

(amp's)

Instantaneous

1.5

amps

120

mv

.

ripple

3

amps
cycle 300
p-p

ripple

40'q

for

1 • 3 g at 5 -

2

gat.

5-,

~l-

:·~t

'60-500

peak

with

p-p

max

peak,

25%

mv

max

15

ms~c

27

27-60

duty

Hz

,Hz

Hi

First
Additional Drive

1.5.6 Physical

Drive with Controller

25

10

watts

watts

Dimensions

• Drive**
Height

Width

Depth

• Front Panel Including
Height
Width
Depth

*Each

specified

shock

Load

and

vibration level

Lever

59.00

217.00

305.00

59.00

217.00

27.02

is

applied separately to

mm
mm
mm

mm
mm
mm

2.32

8.54

12.01

2.32

8.54

1.06

each

the three mutually perpendicular planes of the drive; the planes being de-

as

fined

**Without

the top,

front

panel

front,

and

and

side.

with or without

controller.

in.
in.
in.

in.
in.
in.

of

00701300-000

15

December

1984

1-17