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be superseded in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

• . Cartri'dge
Height
Width

Depth

18.00

209.00

280.00

mm

mm
mm

0

..

71

8.23

1.1.02

in.
in.
in.

FJexible.Disk

•

Weights

Drive with Controller 2.95

•

•

•

The

controller

the

dimensions

Drive without

Cartridge

board

shown

Controller 2.35

is

mounted

below

Physical dimensions of the

mounting holes (Figure 10),

ette

drive.

•

Vertically

The

box

(on

can

be

eith~r

• Horizontally (load lever at

29.21.:!::

lMM

(1.15.:!::

0.039 IN.)

t----

...

completely within the drive casting. Thus,

relate

dri.e

box,

conform

mounted

side)

MOUNTING HOLES

203.2.:!::
(8.00.:!::

- - -- -

Diameter Thickness

.'

198.0

····708·irL

to a drive with or without a

including the location

0.59

mm:'

kg

kg
kg

'0.08

0.003'

7.9 lb

6.3

1.3

controller.

and

size

of

to those of the industry standard disk-

in

any

of the following

positions.

right)

(8-32, 8 PLACES)

t

59MM

(2.32 IN.)

t

0.5

MM

0.0197 IN.)

--

--

---

..

'mm

in''::

lb
lb

its

189.72

MM

(7.47 IN.)

..

13.64

MM

•

(0.504IN.1

-

9.52MM

....

(0.375 IN.) (12.0 IN.)

Figure 10. Drive

00701300-000
15

December

1984

1-18

~

-25.4MM

...

I

I

(1.COIN.)

Mounting

88.9

305MM

MM

(3.50 IN.)

Hole

-

Locations

217M

M

N.) (8.541

,1-.5.7--

-,: Organization'

•.

Cbnfig~ration'

• Formats

Drives per Controller
Cartridges per Drive
Recording Surfaces per Flexible

'Formatt.e'd:

- 'per Surface '.. . . .

Formatted (user available) Sectors

per Track

Records per

B~tes

Surface

Outer

Data
Z-Tracks
Spares,

Inner

{us~r·.availaqleY

Sector

per

Record

(No.

tracks)'

Guard

for

Guard

Bands

Field Flagging
Bands

Total

Tr'ackS'"

Disk

10

Mbyte'

10.5

Mbyte

1 or 2 1 or 2

1 1

1 1

306

64

2 2

256 256

15

306

2

4

16

343

306

306

343

67

15

2

4

16

1.5.8

•

•

•

•

•

Tracks

Sector

Recording

Encoding

Recording Density

Flux

Track

Areal

Density

(No.
Data
ECC
Spares, for Factory

Field Flagging

(No.
Data
Servo
CRC

ID

VFO,

Method

Density
Density

sectors)

bytes)

(2 Records of

Timing

Mark,

and

Total

256

Sync,

Total

bytes each)

and

PAD

64

1

5

70

512

27

6

4

99

648

24,000 bpi
18,000

·67

1

2

70

512

27

6

4

99

648

RLLC

fci

300

tpi

7.2 Mbits/in.2

00701300-000

15

December

1984

1-19

'2.0 ,INTERFACE'

The

host i nterf

the

extended version

information about

)m.pJ,.~m~?_t

~,~

ace 'used in

,i

p~

,,9f>

of

thi-s,

t~,.e

.

.SC.S~.,

the

10/10.5 megabyte di

the Small Computer System

interface

by~"

and

on"

~h.i

device-specific

s

..

,ct.evJ,c~."

~re.,

sk

storage

Interface

subsystem'

(SCSI). General

information about

p.res.ente~~

. i

n.

th

is,.

sect

i on.

is

the

2.1

The

(ANSI)
evaluated
for

input/output

standard,
terial

The
operations
the
completion

ity
ety
host

structure
Up

can

two

Because

ferences

SCSI

conmand

SMALL COMPUTER SYSTEM INTERFACE

term

SCSI

;s

used

Small Computer System

by

American National Standards Committee

efficient

asynchronous communication between computers

devices.

some

variances

presented in

SCSI

request
of

of

to

h'av'e
ports

bus

across

of

of

the

SCSI

peripherals

and

the

makes

eight

devices can

one

at

of

the

is

oriented

'the

the

the

operations.

bus

SCSI

bus (Figure

the

SCSI

bUs

a time,

wide

in implementation

devices

set,

should support most
however.

cumented, -overcoming

to

this

bus,

denote

Because

might

manual.

to

intelligent

the

the

American National Standards

Interface.

of

the

become

p~ipheral

evident

p~ripheral

A proposed

developmental

later

deVices

host Central Process-ing Unit)

structure,

by

adding a

task

even

be

port.

aTl

other

r~nge

the

of

If

the

differenc'es

Because

a host'

single

11).

easier.,

connected to.

Communication

ports

devices'

may

be

of

device-specific

of

this

CPU

can communicate with a

adapter

Standardization

the

SCSI
is

being

that

expected

the

..

shou.1d

inactive.

can use

from

SCSI

not

hardware protocol

orientation

to

al]owed between a

implementations are

(SCSI),

(ANSt)'

devices.

take

and

the

of

bus

the

device

be

difficult.

Institute

SCSI

between

standarq ,is being
X3T9.2

status:

to

and

peripheral

of

it

and

the

the

During

over

bus

control

provide

SCSI

ma-

typical

(at

monitor the successful

and

·the

versatil-

interface

software

at

a time.:

wide

between

command

E~ch

vari-

the

set

device

:maximum

SCSI

to

bus, small

device. All

and

standard

fully

dif­true

do-

of

Additional

X3T9.2

~2

The

HARDWARE INTERFACE

SCSI

system

ication

2.2.1

The

SCSI
ity).
tion
via

is

connector

information about

documentation.

hardware

is

described in

across

Bus Lines

bus

contains

One

control

populated

the

Jl.

interface

bus

(see

Figure

nine

line

the

as

implemented in
this
also

subsection.

are

described.

control

(ATTENTION)

Section

12

4.0).

shows

SCSI

lines

;s

the

proposal

the

The

bus

and

nine

used only

The

following

pinouts.

is

presented in

the

ANSC'

10/10.5 megabyte disk sub-

lines

data

if

and

theory

lines

(including

of

comnun-

the ECC/Arbitration

Signals

are

interfaced

par-

Op-

00701300-000

15

December

1984

2-1

COMPUTER

SIMPLE

SYSTEM

BASIC

COMPUTER.

TWO

CONTROL

UNIT

SYSTEM

COMPUTER

HOST

UP

TO

EIGHT

ANY

COMBINATION

ADAPTER

SCSI

COMPUTER

HOST ADAPTER

SCSI

BUS

DEVICES CAN.

OF

HOST

Figure 11.

COMPLEX

BE

SUPPORTED BY THE

CPUs

AND

INTELLIGENT

Sample

SYSTEM

SCSI

SCSI

BUS.

THE DEVICES CAN

CONTROLLERS.

Configurations

CONTROL

LINES

COM'pUTER

BE

(AT~OUTPUT)

(BSV"INPUT)·

DATA

LINES

PARITY

,LSB

MSBl

l

o 1

I

~

___

----------------------GROUND------------------------~~

. ·Signals from host reference.

Figure 12.

00701300-000

15

December

1984

2-2

J1

SPARE

Host

Interface Connector Pinout

::;ATT~NT.lqN

the

host'

..

(.A~N.).

want

>~.sert.i9n··

s to

send

by

ames s
wfll recognize the assertiOri of
Arbitration option

is

installed

.the.host·:of.thi·s.,signal.;.

age

to the cont

·this·

control

(see Section

ro

11

line

4.0).

er. . The

'only-

indicates

contro

if

'tne

that·,
11

er

EtC/'

BUSY
lng.·the. host ·interface·.··

.

ACKNOWLEDGE

(BSY)

. .

assertion

..

(ACK)

.

assertion
cates each data byte
(read operation) or

is

operation).
RESET

operations
eration,

correct
be

MESSAGE

(RST)

in

the record beinq written at the time

and

deasserted

(MSG)

assert

the

controller

the

ECC

if

further

assertion

ion

sector will not

has been'transmitted
ated. This signal
Signals
plete,
idle,

SELECT

bit
line

on

the

bus-free

(SEL)

on

the data

must

the

controller

assertion

be

d~asserted

is

bus

have

state.

bus

causes the desired

by

the

controller

~

by

the

hQst

on

the

bus

has

been

ready to

by

the host for a

be

received

to cease.

be

commands

by

the

and

the current selection

accompanied

no

Significance.

will deassert

by

the host along with the cont-roller address

when

the

are to

controller

by a REQ-ACK

all

controller

indicates the

of

this

handshake signal indi-

either

by

minimum

If

asserted during a write

is

updated~

be

issued.

indicates

is

controller

received

the

controller

of 1

JL

not

guaranteed to

The

reset

that

'about

sec causes all

to

handshake, but the data

When

control lines

controller

the handshake

and

to

be

selected.

responds with

is

by

the host

(write

line

valid

be

status

termin-

is

return to

BSY.

us-

op-

be

must

com-

an

The

COMMAND

or

status

ence

REQUEST
transfer

of

DATA

data

(C/O)

information

on

the bus.

(REO)

assertion

indicates

assertion

is

that
the deassertion indicates
transfer,

INPUT/OUTPUT
from

from
DATA

bit

controller

host to

(0-7)

parallel

icant
PARITY

transfers
parity
parity
by

the

assertion

(I/O) assertion

controller.

signals

data to/from the host adaptor. Bit 7

bit.

is

asserted to maintain

to

the host.

on

all

option

controller

indicates the presence of data

to host: deassertion indicates

are

bidirectional

command

is

disabled.

and

but will not

by

the

controller

on

the bus. Oeassertion indicates the pres-

by

the

controller

the

controller

receipt

by

of data.

the

odd

The

subsystem contro

data

transfers

Parity

be

will

checked.

is

controller

data

lines

parity

to the

be

indicates

on

a

host-to-controller

ready

For

to

receive data

a

controller-to-host

on

indicates data

transfer

used

to

is

on

all

11

er

wi

controller

generated

that

the bus.

of information

transfer

the

most

data
11

and

test

unless the

in

this

00701300-000

15

December

command

and

transfer

eight

signif-

status

for

odd

instance

1984

2-3

2.2.2 Host Interface' Proto·col

The

host

col

munication

communicates

and

tim.ing.

·t·.·::

Sele2t

2.

Command

3.

Data

4.

Ending

5.

Busy

6.

Abort

with the disk subsystem under

Modes

~ransfer~.

ibn.

of operation are

Transfer

Transfer

Status Transfer

Status Transfer

illustrated

certain

by

the following

rules of proto-

com-

These

ua

The

or rese1ection
ECC/Arbitration option
a

and
vice
ried out

modes

1.
10/10.5

means

assigning

wants

of operation are described

megabyte

as

of allowing

each

to

initiate

by

other devices

disk storage subsystem

described

has

been

more

such

than

device a

operations at anyone time. Arbitration

on

the bus.

in

the proposed

installed

one

device to

priority

in

following subsections of

does

ANSI

not

SCSI

(see Section

initiate

for cases

Reselection allows a peripheral to reconnect to a host
disconnected

is

comp1et'e.

~rbitration

2.2.2.1

The

controller

complished with a

Fi

rst,

is

card.

the subsystem address

a 1 of 8

In
have a different
BUSY

must

itself

The

option has

Selection Sequence

first

decode

(releasing

subsystem

been

must

be

selection

correspond i

the

bus)

··do'es

not support

installed

selected to

s~quence

must

be

ng

to the shunt

a subsystem having multiple

be

address.

tested

to

see

If

multiple hosts are attached to the

if

the

bus·

for

some

reselection

(see Section

initiate

(Figure 13).

p1

aced

on

the data bus.

controllers,

is

available.

reason before the operation

4.0).

an

pos

it i on

this

respond to

arbitration

standard unless the

4.0).

operations

when

Arbitration

on

more

than

the bus,

may

if

the peripheral

unless the

operation. This

Thi

s address

of the cont ro

each

controller

interface,

one

be

is

man-

is

de-

car-

has

ECC/

ac-

11

er

would

After assertion of the subsystem address,

The

controller

responding to the

asserted,

sue

BUSY.

set.

BUSY

Until

in 1 enqth), the cont ro

polls the

select

controller

is

deasserted,

The

only exceptions are at

certain

confidence

11

er

Startup Diagnostics, subsection

00701300-000
15

December

1984

2-4

line

address

and

tests

wi

11

3.3).

SEL

is

asserted.

and

SEL

the bus.

jumper

is

power

(preset

activated, the

on

When

the data

at factory to

controller

or following a hardware re-

are performed (approximately 1 second

not respond to a se 1

ect i on

sequence (see

line

bit

will

0)

cor-

is

is-

:ui~:;

~

-SEL

-~------i

2.0

IJSEC

800

" . -. ----------+-

:

·BUSY·

-C/O

·REo.

NSEC

.

~UB~STEM

---1

~90

MAX--.I

MIN

.

-I

ADDRE~

NSEC

MIN

-..to

NSEC

MIN----~-~----------

...

. •

I

; "

l-- 0

NSEC

MIN

·ACK

NOTE:

After

No

BSY

further

serted.

2.2.2.2

When
then
the
controller
class.

bytes for
If

initiated.

BSY

REQ

command

the

command

o

NSEC

MIN

j

MAX

OPTION

IS

SELECTED

CLEARED

BY

PULSING

and

Command

will occur

I/O

and

~

THE

must

until

C/O

THE

CONTROLLER

FOR A MINIMUM

Figure 13. Select

has

been

controller

Throughout

256

IJSEC

IF

TIMEOUT

CAN

BE

RESET

OF

lIJSEC.

AND

asserted, the host

activity

this

sequence,

Command Transfer Sequence

is

asserted

to

prepare for

byte

and

on

the data

SEL

is

receipt

bus

deasserted, the

of the

and

command

asserts

samples the data bus, deasserts

The

processor then requests the appropri ate

that

type of

command

using the

or parameter bytes are i

same

nval

RESET

LINE

LOW

Sequence

deassert

the

Jines

controller

byte.

ACK.

When

REQ,
REQ-ACK

i d,

an

Timinq

SEL

and

the data

SEL

line

will

has

remain

asserts

The

host then places

ACK

is

asserted, the

and

decodes the

number

handshake.

abort sequence

bit.

been

deas-

deasserted.

C/O

and

command

of parameter

wi

11

be

2.2.2~3

After the
more

of

1.

2.

3.

Data Transfer Sequence

command

~equence

the following

Seek
Start
Start

accepting data

transferring

4. Return ending

ways.

status.

is

completed, the

from

data

the host (write operation).

to

the host

controller

(read/status

will

react

operation).

00701300-000

15

December

in

one

1984

or

2-5

·

I"f'

·'t'he

a

read,
control
SENSE,

and

are

'comma'rid"

the, I/O

the

FORMAT

considered

·DS

~1

·~D

·1/0

•

·REQ

·ACK.

'involve's' a

line

data

transfer

UN

IT, or simi 1

data

is

ass~rted,

(Fiqure

ar

fransfe'r,

and

,the

14).

command

the

'controller'

interfac~

Not~

that

hardware

bytes passed for

s are pas sed dur i

'deasserts

takes

ng

the

'C/O'.

over

REQUEST

dat a ph

For

to'

ase,

parameters.

~

~~~~L----~I

--=::::J'-_~~'-'.;.;;M;.;.;.f:-C

71

NSEC

MIN--l

I VALID I

..:.1-.;..

READ

DATA

~

__

V_A_LlD

__

•

__

V_A_LlD_

.....

__

V_A_Ll_D

__

------------------------------------

___________________

0

NSEC

MIN

140

NSEC

MAX

TO

MAINTAIN

f-

TRANSFER

SEQUENCE

INTERLEAVE

(CONTROLLER

TO

1

HOST)

_

..

MEASURED

-

MEASURED

-

ONSECMIN
256
3CO

.......

2.0
IF

_

•••

NOT

the

may

from

REQ.

write

the

entire

two

be

sustained.

operation

the

The

For a
until
of
sec

For read
data

ing
pleted.

00701300-000

15

December 1984

2-6

AT

THE

AT

THE

/.ISEC

MAX

IF

MAX

MAX

FOR

TIMEOUT

TO

MAINTAIN

FROM

ON

TRACK.

TRANSFER

NSiC
MSEC

ALREADY

VALID

Figure 14. Data

operation,

record

256

byte

the

disk.

REQ-ACK

CONTROLLER
CONTROLLER

IS

ENABLED

INTERLEAVE

LAST

PARAMETER

THIS

TIME

PARAMETERS

the

or

buffers,

hardware

It

then begins

handshake

DRIVERS
RECEIVERS

1

BYTE

IS

USED

FOR

TRANSFERED

hardware

records

full

TO

DEASSERTION
COMMAND

DURING

Transfer

instantaneous

waits

continues

OF

,C/O

DATA

FOR

AND

PHASE.

DECODE

asserts

are

transferred.

until

the

high-speed

DATA

READ AND

WRITE

SETUP,

COMMANDS

Sequence Timinq

REQ

and

the

By

the

data

FIFO

rates

buffer

data

until

the

read

handshake

the

overlapped use

of

1.13 Mbytes/

has

256

transfer'

operation

continues

byte's

by

assert-

is

com-

of

.

2.2.~.4.:~nd.ing

.

'.'

.

'.

.

~.

.

S~atus

::

: .

.,.

.'

l'rans(er.. Sequence.

. . .

.'

'.

.

After

a·
quence
and

liD.

REQ.

..

wi

REQ

1.1

.deassert.

Following

dicate

ed

MSG

and

REQ
controller
ing byte.
next

transaction.

·C/D

·DB

0-7

·REQ

command

(F

i gure

It

then places the

wi

11

REQ

transfer

that

the operation

assertion

is

as

serted.

interface

The

ex'ecution·, the· contro11er·in·:ti ates·

15).

st

controller

The

cont

ro

11

er

beg i ns

ay

status

as

serted unt i 1

byte

ACK

on

is

and.;the h,ostmust· deassert

of the

is

added.

lines will

status

is

REQ

byte,

complete.

The

ending byte

wi

11

st

be

an

ending byte

With

ay

as

serted

deasserted following

then will return to a polling

;.--

____________

---.'-

th

is

the interface

rece i

ACK

...

C/D

and

;s

placed

unt

VALID

COMPL

L---90

NSEC~

MIN

an

sequence

ved.

The

:

is

liD

on

i 1

ACK

transfer

',;--.;.

____

ending

by

bus

contro

status:

as

sert i ng
and

11

C/D

asserts

er then

transferred to in-

still

is

mode'and

being

assert-

the interface

rece i

ved • All

of the

await the

_

bus

end-

se-

·BUSY

Ending

o

NSEC

·ACK

_G--------------------~~~I

•

HOST

MUST

VERIFY

BUSY

status

byte information

Bit 0 =

INACTIVE

Figure 15.

Parity

o =

1 =

BEFORE

error

No

error

Parity

ISSUING

Ending

is

decoded

error

NEXT

Status Transfer

MIN

r---

'1.

",SEC

____

-

COMMANO

IN A MULTIPROCESSOR

in the following

in

conmand

host

Bit

Completion

o =

Normal

1 = Error occurred in

status

completion

command

1 =

Bit 2 = 0

MIN

___

--_-

__________

Timinq

or parameter

execution

I--

.,

1

IMPLEMENTATIOW

way.

transfer

",SEC

MIN

from

00701300-000

15

December

1984

2-7

Bit 3 =

Busy"st~tu~"

o =

1 =

Normal'

Hardware

status'

busy

(e.g.,

embedded

seek)

Bit 4

-Bits'

= 0

5~6·:'"Ori~e:numbe~

Bit 7 = 0

2.2.2.5

At

times the
Some
tial
mand

bringup, drive checkout,

examples
is

Busy Status Transfer Sequence

controller

of

this

issued

by

the host, the

stead of accepting"the
controller
tion

(bit 3 set).
asserted. This
all

control

the

controller

transfer

is

sending

status.

After the

is

the

lines

;s

will

free

sequences will begin.

Since the busy sequence
ware)

the timings

may

,be

16).

will

be

too

condition are

or

an

controller

command.

This indicates to the host system

The

ACK

handshake,
normal
become

to

may

.somewhat

command
deasserted. This sequence will repeat

accept

be

handled

faster

busy

when

off-line

status

to

honor

the

controller

seek.

will

byte

MSG,

commands

At

assert

wi~l

reflect

C/O,

is

such

c/o,

I/O,

from

undergoing

times,

I/O,

the

and

completion sequence. After the

commands.

differently

than a

At

this

normal

time

normal

(internal

selection (see Figure

the host.

ini-

if a com-

and

REQ

in-

that

busy

REQ

condi-

will

the

be

ACK,

until

command

to the hard-

·OB

-SEt

·BUSY

-MIG

-REO

·ACK

11-1'"

·C/D

~/D

9G

NSEC

MIN~

870

NSEC

MI~

Figure 16.

SUBSYmM

r--

h

--1

~"

870

ADDRESS

70

NSEC

0

NSEC

MIN

r--

NSEC

MIN--.,

170

NSEC

MIN

a

NSEe

Hardware

~

MIN~

~

VALID

STATUS

t-- I I

I

~

~

~

I

MIN

---l

t--

I

~

I

Busy

I

I

I

---t

1-

-I--

Status Transfer

---i

rl

~

I

I

I

870

r-'40

~

NSEC

NSEC

3SDNSEC

I

VALID

~70

870

NSEC

MIN---1

MIN

~

I I

MIN
MAX

Timing

CDMPt

NSEC

I

I

,.

MIN

"

I
I
I

I--

I

00701300-000

15

December

1984

2-8

2~2.2.6··

The

...

..

Abort Sequence

following conditiorrs will cause the

quence.

1.

Receiving

:2"~""

Recei\rln'g

3. Receivinq a wrfte
protected

4. Improper
Parity

5.

6.

Motor

an

inva,l

.·'parameter:'·

..

exec~tion

error

on

the host bus.

spinup or

id

command

bytes

~ommand

or completion of

spindown

byte.

that,

controller

..

are",

p'ut'

of'

to

'the

initiate

speci

fi

of any'kind for a cartridge'

any

data operation.

(BUSY

STATUS)

an

abort se-

"

ed"r·ange

that

is

..

wri~e'

When
immediately

2.2.2.4
tion
to a polling

2.2.3 Reset Condition

The

low
will not

Upon a reset,
to
will
qu
host
Typical recovery time

2.2.4 Electrical Requirements

All
face 1 i

network.
Figure
adapter or
troller

any

of these conditions occur, the

and

execute

for

detail).

that

reset
for at

precipitated

mode

and

condition of the

least

1 microsec.

create a reset,

the

qo

into,a

be

bus-free

suspended immediately.

aranteed under th

reset

SCSI

wi

11

not

bus

signals operate at standard negative-true

nes

are termi nated at the subsystem controll

The

host

17).

In a mu1t

controller

is

shipped with socketed 220/330

an

Ending

The

status

byte gives information regarding the condi-

the abort.sequence.

await the next

SCSI

bus

The

but will respond to one.

controller

'state.

is

cond

create

will deassert'

Any

it

i on.

a

Uni

after a reset

interface

adapter should

ip1e host adaptor or

on

the multidrop cable should

controller

Status Transfer

The

transaction.

is

reached

10/10.5

megabyte

all
operations
Completion

The

error

t Attent i

is

2 milliseconds.

that

of,

st

on

atus

error

be

controller

ohm

terminators to allow for a

will

Sequence

cQntro1ler then will return

by

droppinq the

disk storage subsystem

bus

lines

may

have

any

operation will not

wi

11

for the next

er

terminated

system, only the

be

terminated.

ple mu1ticontro11er configuration. Devices driving the

be

an

should

open
voltage level of
hysteresis

are

the noise margin

not load the

line.

per

bus

collector

less

than 0.5

recommended

(74LS240,

with

more

capable of sinking at

vdc

(7438

for receiving the

74LS14,

than

or equivalent).

one

low

or equivalent). Receivers with

controller

power

least

The

Shottky

assert

I/O

and

C/O

(see subsection

and

been

not

reset

allow the

taking place

be

cleared. A

line

bus

command.

TTL

levels.

wi

th a 220/330

similarly

Inter-

ohm

(see

end

The

con-

sim-

controller

48

milliamps to a

outputs to

inputs

improve

host adapter should

(LS)

TTL

input load

be

00701300-000

15

December

1984

2-9

CONTROLLER

TYPICAL

HOST

ADAPTOR

74LS240

INTERFACE

CABLE

Figure 17.

2.3

The

cribed in

command

SCSI

SOFTWARE INTERFACE

command

this

set

set

used

subsection.

under the proposed

Interface.

2.3.1

An

I/O
Block
code

Command Structure

request

(COB)

and

the

from

to

the

command

controller.

operation parameters,

address,

mand.

and

the

A typical

number

CDS

74LS240

8M

(20

FT)

MAX

Host

by

the 8 inch removable disk storage subsystem

The

the host

IS

operat i

such

is

as

of blocks

structure

Adapter

set

ANSI

definition

performed

The

first

on

code

is

Bus

structured to

by

byte of

(OPCODE).

the Logical Unit

is

needed

shown

to

transfer

in the following example.

Termination

for the

passing a

this

Subsequent bytes specify

Number

in a data

74LS14

EQUIVALENT

satisfy

Small

Command

COB
(LUN),

OR

;s

the extended

Computer

Description

contains a

logical block

transfer

des-

System

group

com-

COMMAND

BIT

BYTE

Note
check
roes,
error

00

04

05.

th

at,

accord i

condition

which

code

would

will indicate the

LOGICAL

VU

must

GROUP

CODE

UNIT

NUMBER

ng

to

SCS

be

reported.

indicate

00701300-000

15

December

1984

2-10

5 4

I proposed

no

error,

media

OPCDDE

MSB

LOGICAL

LOGICAL

BLOCK

ADDRESS

LSB

LOGICAL

BLOCK

NUMBER

OF

BLOCKS

st

andards, . a

The

SCSI

class

but the Sense

changed

status.

2 o

BLOCK

ADDRESS

ADDRESS

med

and

code

Key

This

LINK

i a

ch

ange

values are ze-

and

Diagnostic Port

means

that

means

on

a

all

'·powerups·!

closed, the subsystem reports a

command

'an'd:

s;

nce

.

every·:t"-·i'me:·th~

..

··

load' "lever'" :6f,··the.

check

. the

med

i a

ml

ght h ave-

again for the operation to take place.

The

LUN

.

tr.oller.

ed

to each

The

operation

following

in byte

is.: to

controller,

commands

01

of a

..

respond ·to

code

of the
are supported

command

..

;the~

the

hi'gh

COB

indicates

command

order'

specifies

by

:·drive:···is·····opened.·

condition to the host

been

this

c'h

........

Since.>:

bits

anged.

which

,mu'st

the

particular

up:.:.to,.two

The'

driv'e

'always

disk storage subsystem.

after

command

on

the selected ·con-

..

drtves,:.may . be.

mu

'be' a zer'o:

command

desired.

·and·',then.:
the next

st . be

att

sent

ach.-.

The

OPCODE

00

01

03

04

06

07

08

OA
OB

12

IB

10

IE

25

28

2A

2E
E5

These
The

terpretation
cates

allow

of these

bits

commands

last

byte of a typical

that
command

bi

labeled Reserved also are ignored.

(Hex)

COMMAND

Test Unit

Rezero

Ready

Unit

Request Sense

Format
Format

Uni

t

Track

Reassign Blocks

Read

Data

Write Data

Seek

Inquiry
Start/Stop
Send

Prevent/Allow

Read
Extended
Extended

Write

Read

are described in subsection

Command

of the

these

SCSI

bits

command.

are reserved for future needs;

Diagnostic

Media

Capaci

ty

Read

Write

and

Verify

Long'

.

Data

The

Block

VU

Removal

2.3.3.
allows for device-specific in-

means

vendor unique;

and

FLAG

RESERV

REQ

chaining options for special purpose application. Since

ts

are

needed

or

used

by

the subsystem, they are ignored.

and

indi-

LINK

none

Any

2

..

3.2 Logical Block Addressing

All addressing of information stored
block addresses. This

secto~

on

an

ticular

blocks
current

aad

track flagging, seeking,

the disk,

use

logical addressing to

individual block, the host

t·rack, the host

on

that

track,

track.
that

means

specifies

If a command

seek will

on

the disk

that

all

etc.)

specifies

the block

operations (including data

that

make

its

specify a

that

block

number

implies a seek to a track other than the

be

executed automatically.

is

done

by

means

of logical
transfers,

particular

specification.

number.

To

access a par-

location

To

access

of anyone of the logical

00701300-000

15

December

1984

2-11

,The blocks'

range

from

41,004

responds
of

specified

ceeds

·b·'

the

ock'

'ADDRESS,

available.on

block zero

for

the

to

one

blocks

number·

error

the

to

bl'ock

10.5

logical

Mbyte

record

drive~

of a data

blocks allowed

available

"greater·· than . the"

..

'.

2.3.3 Command Description

10

Mbyte

39~16i

Each

sector

on

the

number

8.inch
for

removable

the

block

(see

by

the

devices.

avai·l able ,will

..

,disk.storage·.subsystem.

io

Mbyte

is

256

bytes in length

subsection

SCSI

command

Attempts to

device

1.4.1.1).

structure
specify

result

and

in,

to

and

The

far

a

logical

an

..

INVALID

'block

cor-

range

ex-

Implementation

device

differences.

of

the following

Thus,

ensure proper operati·on.

2.3.3.1

The

TEST
byte
not a

if

Test Unit Ready Command

COMMAND

BIT

BYTE

00

01

02

t---

03

05

UNIT

the

request

o

-t-

--

--

VU

READY

addressed

for

unit

LOGICAL

--

command

unit

the

o o

UNIT

NUMBER

--

RESERVED

----

RESERVED

--

returns

is

powered

self-test.

commands

careful

4

--

may

vary

study of each

3

RESERVED

------

zero
on

and a cartridge

--

status

slightly

command

2

--

--

in

the

to

account

is

important

o

--

----

completion

is

loaded. This

for

to

status

is

2.3.3.2

The

REZERO

Rezero Unit Command

COMMAND

BIT

BYTE

00

1---,+------

I---it--

04

05

UNIT

o

--

VU

command

LOGICAL

--

6

UNIT

--

causes a seek

----

status.

00701300-000

15

December

1984

2-12

5

fJ

NUMBER

RESERVED

----

RESERVED

4

o

--

to

3 2

----

track

--

----

zero,

and

-----

cl

fJ

ears

~Yly

error

,:,Th.is"

command,
control
received,

(.b

it

1

=0),

operations
for

any

"STATUS··

(s~e"

operation
command
command

"i:s,

,an,

'off...;.lin~,

of

the

'bus

wh;

le

the

controller

and

re 1 eases

while

operation

is

the

until

subsect

complete

seek

i'on.·:

when

after a REZERO

to

determine

if

command,.'.:meaninq,

the

operation

immedi

the

the

2".,2'~2'

UNIT

the

ately

bus.

is

the

or

The

taking

seek

.5-)·/ i,f:':selected ..... " The··' host··,

is

control

SEEK

operation

the·.

is

taki"ng

controller.

pl

ace.

When

,relinqu,i.shes.

the

responds -with normal, completion

host

place.

complete,

then

The

may

break

controller

and

will

away

and

is

respond with

detects . that

Ter "accepts

.command

was

successfully

l09ically

a'

new

may

completed.

command.

be a REQUEST

command

is

status

do

other

unavailable

BUSY

.~

the:

The

first
SENSE

2.3.3.3

COMMAND

BIT

BYTE

00

04

05

The

REQUEST
information
sever
that

code

Byte
cates
the

a 1 d

iff
this
present

04,

wh i ch

how

controller

Request Sense

6

LOGICAL

UNIT

NUMBER

VU

SENSE
from
erent

is

the

will

much

command

the

.disk

amount s and

only

spec i

not

command

be

fi

es

i·nformat i

returns

more

Co~mand

NUMBER

RESERVED

RESERVED

OF

BYTES

REQUESTED

is

used

subsystem.

types of i nformat i
that

cleared.

the

number

on

wi

11

be

bytes

4

o

by

the

It

will

not

of

bytes requested

returned.

and

types

2

host

is

to

request

a multipurpose

on

may

clear

of

error

As

more

information

o

LINK

status

command

be

requested.

status.

by

the

bytes are

as

shown

and

sense

in

that
Note

Any

error

host, i nd

requested,

below.

i-

Number

of

Bytes

Requested

o

to

6

7

to

8

9

to

12

13

to

82

83

to

98

99

to

255

The

types

cribed

protocol,

in

of

information

the

follow.ing paragraphs.

the

Media

Check

returned

condition

Information Returned

Regular sense
Extended sense

data

data
Extended sense plus
and

code

The

above plus
track
The

above plus

The

above

for

the

In

number

plus

number

accordance with

Z-track

sector
flagged

of bytes requested are des-

can occur during

original

dat a and

10

data

track

the

this

command.

15

error

class

current

listing

proposed

SCSI

00701300-000

December

1984

2-13

2.3;3.3.1 ...

:'

"Regula'r'

Sen'se'

Oata

If a r'equest

fi

the

the

st

four

will

. ' RETURNED PARAMETERS

7;1i-·:::,·-:-,;-,-:-:::-'~67'~

BYTE

00

02

03

ve

or

data

Tour

address

reported

place.

is

set,

classes

th~

type

that

0,

1,

subsystem,

i c s

error

extended

m and,

bytes

If
their

to

If

address
took
bit

Error
determine
qeneral
within
vice:
drive,
no

portinq
presented
X3T9.2

SCSI

for

to

six

have

will

six

the

bytes

be

bytes.

val;

If

the

the

address

and

nature

of

class.

2,

3,

codes.

sense

in

Appendix A

proposal

zero"to

bytes

'six

of

followinq

are

meaninqless.

d hi

tis

specifies

error

is

codes

error

of

are

a

and'

Five

and

z.

and

system,

Cl

as

data.

of

documents.

bytes

sense

format

~ T -'~~'~'~:-:-{~~

requested,

set

the

class

the

used by

system

the
different
Classes

s 7

Complete

this

of

data

dat a wi

•

LOGICAL

LSB

LOGICAL

bytes

A

request

and

the

loqical

or

location

address

code

for

the

failure.

error

code

error

0,

1,

and 2 indicate

respectively.

is

a spec i a 1

error

document and

is

made

11

be

-:-~ -

BLOCK

ADDRESS

BLOCK

ADDRESS

04 and

for

less

error

are

Small Computer System

cl

non-zero

which

The

indicates

class

Class 3 reflects

error

class

in

by

thE1

REQUEST

returned.

-'-'1""-7

05

wi

than

ass

and

on

which

the

codes

error

types

11

and

class

tne

are

errors

bp.

four

code

the

the

are

particul

used

The

-

returned,

bytes

are

last

specifies

related

c 1 as s number used

and

the

code

appendix

descriptions

SENSE

fi

rst

~

-,-'

defaults

zero,
operation

address

valid.

Interface

ar

in

this

startup

for

of

the

com­four

valid

error

to

diag-

ANSC

but

the

to

the
de-

the
re-

are

Status

mand

2.3.3.3.2

When

the
Class

errors
device-independent

is

not

after

more

a

than

following

7,

code 0

into

cleared

reset,

by

status

the

Extended Sense Data

six

bytes

extended

of

sense

indicates

classes

that

software

00701300-000

15

December

1984

2-14

host

posted

data

format

the

use

require

to

recover

reset.
prior

are

is

of

similar

to

asked

used.

t~is

from

If

REOUEST

the

reset

for

by

format.

recover'y

errors.

SENSE

will

the

is

be

REOUEST

The

Sense

actions.

the

first

reported.

SENSE

Key

'This

com-

command,

divides

allows

RETURNED PARAMETERS'

----------------'---'

-

~_

.:;-.:

-

,81T

BYTE

01

~

7 6

--r-------r----------

AQVA~D_I

..

~·:'~·::--~R-;;RV~;:.'~~·'~',~J.·:·:,

____

5,

~~

____

------------

4

RESERVED

RHmVm

. 3

_.J

____

~-,

'·:-O::-:-~'SENSE"K~y-:-:~·~~~-'

--------------

---'---"";';-

2

_=_D~~

______

o

_

-

..

'.

04

05

08

07

Bytes

07

to
continue
through
ed, but

2.3.3.3.3

As

05

and
specifies
the

REQUEST

as

06

will

it

will

stated,

06

the

SENSE

requested.

Extended Sense Plus Error Class and Code

~rror

reporting format.

precludes using
nine or

08

will contain the

through

more
O.

bytes of data are requested

Description of the

RESERVED

MSB

LOGICAL

BLOCK

ADDRESS

LSB

LOGICAL

BLOCK

ADDRESS

ADDITIONAL

ADDITIONAL

SENSE

SENSE

LENGTH

BYTES

give the logical block address for the

number

be

sent.

be

zero.

cl ass

Using

them

of additional bytes

command.

If

If

7,

the

Those

only seven bytes of data are requested, bytes 0

eight bytes are requested, byte

code

0

class

indicates

and

additional bytes

code

that

the use of the extended

bits

to indicate the nature of a

by

the

error

class

error

and

code

codes

for the

is

presented in

are valid for the response

of byte

failure.

REQUEST

last

last

start

operation.
with byte

07

00

for

Therefore,

SENSE

command,

operation in

Appendix

will

this

Byte

08

be

add-

status

purpose

byte

bits

A.

and

if

6

If

exactly nine bytes are requested,
extended sense information plus the
bytes are requested, the requested

all

bytes past the ninth (byte

in each of these cases.

2.3.3.3.4 Z·Track Data and Current Track Number

Each
called

cartridge

Z-tracks,

in

which

cartridge-specific

Format
The

tor

of the

cartridge

information recorded
interleave

value,

dwell timer count. Sector

th,e

controller

08)

error

number

will

class

of bytes will

be

meaningless.

the disk storage subsystem

are

used

informat.ion~

is

described in subsection

on

the Z-sectors of the Z-tracks includes the sec-

ECC

enable

interleaving

for diagnostic purposes
The

Z-track format

status,

post-write

(see Figure

and

has

1.4.1.1.

will respond with the

code.

two

is

eRC

19)

If

10,11,

be

transferred,

Byte

07

will

maintenance

and

for recording

shown

check

in Figure 18.

status,

5s a way

or

tracks,

of

inter-

and

00701300-000

15

December

12

but

be

1

1984

2-15

a

'lacing

revolution

subsection
operations
CRC
dwell timer

'full

'range of'

'logic"al'

check

speed

latencies

1.4.4
on

the

forces

specifies

'i'f

'no'

;"two"

to"12'''coiJnts;"w;'th, each

sectors

minutes. A count

given.

Z·TRACK

,0'

Iz

R R R R R R Rlwwwwwwwwlz R R R R R R Rlwwwwwwwwlz R R R R R R

40 47148

Iwwwwwwwwlz R R R R R R RlwwwwwwwwlE

NOTES:

Z:

EIGHTEEN

THE

BYTE

BYTE

R:

SEVEN
HAVE BEEN

READ

SECTOR

SECTOR
SECTOR
SECTOR
SECTOR
SECTOR
SECTOR

• If unused spare, FO hex

BVTES'OF

11

BYTES

1

BITS

MSB

76

5 4 3 2

X X 0 0 0 0

XXOOOOI0
XXOOOI00
XX001000
XXOIOOOO
XXOI0001
X

XI

00000

X

XI

000

BIT 6-ECC/NON.ECC

BIT 7-POST·WRITE

2:

DWELL TIMER

BITS

BITS

SECTORS

DURING

1.

2.

3.

4.

5.

6.

7.

..

on, a track

when

the

for a description

cartridge

(if

a read back

the length of time

'access

of

718

ASSIGNED

LoSB

10

CI 1 -1-

10

o ECC

1

NON.£CC

o

ENABLE

1

DISABLE

0-3-

TIMER
COUNT;
OR

15 • DISABL.ED)

4.7.0

REPEATED

PRE·WRITTEN

STARTUP

i,s

made

15,

which

INFORMATION

ARE

INTERL.EAVE

10

MBVTE

2 2

..

8

16
32

COUNT

MIN

AS

DIAGNOSTIcs.

in

ARE

AS

FOLLOWS.

1o.s

MBVTE

--1­4

17

34

CRCoCHECK

(2.S

MINI

2,

MAX

12

FOUR

TIMES

NOTED

BEL.OW

CRC

ERRORS

AL.L.

Is

STRESS

PATTERN

INCREMENTING

RESERVED
RESERVED
RESERVED

each byte; if flagged spare, FF hex in each byte; if used track, address in

to 'increase ,throughput

host

15116

55156

REPEATED

ON

is

slower than the disk subsystem.

of

'interleaving.

the

ECC

option

CRC

check

to'

it~,

..

co'unt

will

BYTES 3 THROUGH

3,

S,

1,

9,

1~

13,14

15,

17,

THE
ANO

PATTERN

TO

MSB

101010101010101

.. -

6

10101010101010111

I·

101010101010101

10

101010101010!0111

101010101010101

12·

10101010101010!11

16-

101010101010101

11

10101010101010111

TRACK,

ARE

disable

FILL

EACH

is

after

the

drive, will remain spinning

,This,

t,i'mer

'representin~r

the

23124

63164

555 5 sl

SECTOR

18

LoSB

MSB LSB

I I I 1 I I I I I 1

1010111110101*1

1 I

II!

10101111101110101

I I I I I 1 I I I I

10101111iou10!11

1 1 I 1 1 1 1 I I I

10101111101111101

i

TRA.CK

ADDRESS

w:

THESE

SECTORS
DURING
WILL

BE

BACK

AND

OPERATION

E:

THE

ECC

5:

SPARE

SECTORS.

The

present).

all

write

count has

dwell

69

DESIGNATED

FIRST
SPARE

I 1 I 1 1

SECOND
SPARE

THIRD
SPARE

FOURTH

SPARE

HAVE

EXTENDED

WRITTEN

SECTOR

WITH

COMPARED

OF

THE

FOR

..

by

cutting'

ECC

bit

The

operations.

approximately"

timer,

31132

Z.

BAD

TRACK

TRACK 1 ADDRESS

BAD

TRACK

TRACK 2 ADDRESS

BAD

TRACK

TRACK 3 ADDRESS

BAD

TRACK

TRACK.

ADDRESS

BEEN

RESERVED

STARTUP

READ

VARIOUS

TO

THE

DIAGNOSTICS:

PATTERNS,
ASSURE
AND

WRITE

Z·TRACK.

two

PROPER

out.

~nables

post-write

·an·'

'allowable

also

ADDRESS

ADDRESS

ADDRESS

ADDRESS

FOR

CI

bytes.

39

RI

(301)

(301)

(309)

~310)

USE

THEV

RI!:AD

RCUITRV.

may

full

See
ECC

The

at

'2,.5

be

Figure 18. Z-Track Format

__

-----------------~WARJNING------------------

The

purpose

life

by
periods of
fect

media

of

spinning

inactivity.

life.

00701300-00Q
15

December

1984

2-16

the dwell timer

the

drive

at

half

Disabling

is

to

speed

the

extend media

after

timer

may

long

af-

__

10

INTERLEAVES

MEGABVTE

OF

1,2,4,8,

INTERLEAVE

16,AND

32 ARE POSSIBLE.

·10.5

INTERLEAVES

'AOTATION~

DIRECTION

MEGABYTE

OF

1,2,4,

INTERLEAVE

17, AND 34 ARE POSSIBLE

Sector interleave

of

the

host peripheral channel. Without interleave.lengthy rotational delays (40 msec) would occur

the

subsystem's maximum transfer speed.

Interleave

of

spacing sectors varies according

by

Xs·)

during the first revolution for each interleave level. The sectors skipped on the first revolution

For

example-four revolutions are

Sector addressing for each interleave
ten.

Once programmed on

To

obtain
shoul
Any
ferred,
each

2.3.3.3.5

The
the
Requesting
cause

tion
to

one

is

provided by the controller

is

accomplished by writing consecutive records of data into sectors separated by a specified number of sectors. The number

this

d·

send

the

additional

but

they

of

these

to

a chosen interleave factor. This illustration shows the sectors that would be operated on (denoted

~equired

the

level

Z-tracks, interleaving

information

REQUEST

bytes

will

cases.

to

help match the data rate

to

fill

all

sectors of a track with interleave 4.

is

a function of the microprocessor-based controller. The physical sector

is

Figure

invisible

19.

to

the user.

Sector

contained

SENSE

requested

contain

command

past

meaningless

(on

a sector basis) between the disk and controller

Interleaving

in

the

and ask

13 and

information.

Z-track

for

up

Sector I D Data

abilit.y

track

the

of

to

often

83

controller

the

track

sector

read

is

or

10

the

useful

more

bytes

to

indicated

byte

for

Identification

in

determining

of

information

send

out,

in

each

in

bytes

sector

(10)

the

order,

11

and

on

the

information

condition

in a REQUEST

70

12.
track.

13

through

bytes

These

if

the host could not keep up with

will

be used on subsequent passes.

IDs

are not rewrit-

controller,

to

82

bytes

82

will

Byte

07

from each

the

of

be

will

sector

of a specific

of

IDs

SENSE

sector

70

are

bytes

sent

command

10

informa-

correspond

consecu-

to

host

data.

trans-

be 5

track.

will

that

in

on

00701300-000

15

December 1984

2-17

t1ve'ly"

been
field
contain a
this

."

The

the
SENSE
through
data,
contain

's'ta~ti'ng'

flagged, the

of a sector

code

'at:' sector'

10

byte for'

is

not readable, the byte representing

that

specifies

'0,'

if 0 is

that
the

sector wi'll contain

error.

fdun"d

purpose are:

··-:·80::.~·.·.ID·.

81

=

82 = Out
83

= Sector

sector

EXTENDED

command,

and

75

R~·ad·'Er~~~·.(~i·th·er:

10

PES

Error

out of

and

limits).

of

Sync

the hardware apparently

Mark

10 bytes will

SENSE

all bytes

12

wi

11

contai n the

current track

in

all

cases.

(10

(the

Error

be

format.

number

read

after

TO

~

Sync'o'r

err~r

controller

(no

sector

sent

If

84

back

to

number

EXTENDED

bytes

accompanied

has

is

mark

to the host in bytes

98

SENSE,

as

on

that

track. ,

FO

..

(hex).

that

The

10'

.eRG)

missed

out of

was

error

codes

used

~.:-...

by

a position

two

sector

sync

with the

detected).

13

bytes are requested
82

will

be

error

meaningless. Bytes 0

cl ass

and

previously described.

If

·'a

sector

If

the

sector

(in

error

m~rks

10

hex)

signal

in

disk).

through

by

the

82

REQUEST

code, Z-track

Byte

07

h'as'

will

for

a

row

will

10

of

RETURNED

00

01

02

03

04

05

~t

07

08

Of

10

11

;-

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

PARAMETERS

7

6

ADVA~==-

- -

________

---

ADVALI_~

~ST'WRITU

I

~~N'i.~'!.~·

1=015"81.£

=

,

T-

-RESER~;;;-

--

-=-

£cc---r

_N'.~._

1=C115"8~

__

- - - -

RESERVED

5

CLASS7

- -

_LOGICAL

-;;ROR'CLASS

I

INTERLEAVE

_.

LOGICAL

LOGICAL BLOCK

LOGICAL BLOCK

ADDITIONAL

-;R~TRA'CK~ER

4

3

=--I_-=-

.

RESERVED

--,-.-

---1-

________

BLOCK

ADDRESS

MSB

ADDRESS

ADDRESS

BLOCK

ADDRESS

L~

SENSE

LENGTH

~

I-

11.2.4

.••

ts.

OR

- _ I DWELL TIMER

CURRENT

TRACK

32

FOR

NUMBER

~

10

MSI

LSI

z o

__

cOOEo

___

-

--SENSE

--

(5)

MOYTE;

t.2.

- - - - -

;;;-

- - - -

ERROR

CODe

4.17.

0 R

34

FOR

COUNT

(2·12

--=--=

- -

=~_--=

t

OR

15)

--

_

--

L5

MOVTEI

-=-=--=

--

2.3.3.3.6

To

get a 1
host shoul d
data.

also
after

As

add

byte

Flagged Track Listing

isting

send

of the tracks

the

REQUEST

a response, the

the flagged track

98

will

be

meaningless. (Byte 0 =

00701300-000

15

December

1984

2-18

that

SENSE

controller

list

in bytes

have

been

command

will

send

83

fl

and

agged

ask

on a cartridge,

for

99

to

sense bytes 0 through

through 98.

first

byte.)

Any

the

255

bytes of

83

and

bytes requested

· . . .

Byte
Byte
Byte

By~e,

Th

is

pattern is' repeated three

in bytes

83 = MSB
84 = LSB
85 = MSB

86"

,:::

L.S~,~.f..

87

through 98.
bytes corresponding
and'84) will

be

FO

of

Bad

of

Bad

of Track

Trac~

to

the

hex.

Byte

Track
Track

307

397..,

If

a'

bad

07

(the

first

,

more

times for spare' tracks 308, 309,

spare track

track

will

number
be

spare track)

has

not

for

that

91

in

all

been

assigned, the

spare

(e.g.,

of these cases.

and

bytes

310
two

83

2.3.3.4

The

FORMAT

tive

areas

specific

unique versions of the
The

8 inch removable disk subsystem allows multiple configurations of these
bits.
performed.
The

extended implementation

(bits
occur
result

Format Unit Command

COMMAND

BIT

BYTE

00

05

7

o

LOGICAL

-----r----------------

RESERVED

RESERV

UNIT

command

on

the disk. This standard

6

UNIT

implementation

command.

If

0,

1,

when

in

bit 4 is

In
and

bits

an

ILLEGAL

zero, the proposed

this

case, the values of

3 are disregarded). A device-specific

1,

2,

and

REQUEST

4 3 2

o

NUMBER

o o o o

FMT

DATA

COMP

RESERVED

RESERVED

INTERLEAVE

permits the host to

by

using byte

01

bits

SCSI

is

performed

4 are

set.

Any

error.

LST

DEFECT

set

parameters

SCSI

command

a through 4

LST

LIST

FMT

LINK

and

flag defec-

allows for device-

to

specify

standard implementation will
bits
if

a through 3 are. disregarded.

bit 4 is

one

and

bit 2 is

interpretation

other values for these

bits

vendor

be

zero
will
will

2.3.3

..

4.1

The

FORMAT

The

interleave

the

Z-tracks of the disk

for

a description of

fault

to

matting with

on

the disk

Standard Implementation

UNIT

command

value

an

interleave

verification

cartridge

is

executed

in

byte

04

cartridge

interleave).

of one. This

and

an

and

rearranges sector

off-line

will

be

(see Figure

A value of zero

bit

(see subsection

used

to

set

19

the

and

in

2.3.3.2).

interleave

paragraph

this

field

configuration indicates

value

2.3.3.3.4
will de-

media

auto-flaqqing operation of defective areas

IDs

physically

on

the disk.

00701300-000

15

December

on

for-

No

1984

2-19

p.re,{i

This' process

ous.1y:

wri

tte.n

..

use,r

take~

betw~~n··l.~

condition' of the medla.
block .

.:

d,ata'
No

can

be:,

r,e.cov:e~e.d.

and

5"miriute~

parameter· bytes are sent

~fter

.thi s command

to complete,

after

begin.s

dependi.n~

the

command

on

•...

the"

data

. 2.3.3.4.2

This

command
status
off-line
of the

The

host

the

number

sib

1 e
dress.
of

no

..

Extended Implementation

will

has

been

condition.)

command.

must

of additional bytes to

by

four,

The

number

defects

be

executed

transferred.

The

defect

send

at

least

as

each four bytes'

must

be

in the range of 0 through 128, allowing a

and a maximum

off-line;

no

(See section

list

is

transferred

four bytes of data, the fo.urth byte indicating

be

transferred.

'wi

11

represent

of

32

defects reported.

will contain the logical block address .(most

defect.
this
been

The

first

device.

Ending

transferred.

ADDITIONAL

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

BIT

BYTE

00

01

02

03

two

bytes of

status

The

defect

Format

COMMAND PARAMETERS

7

6

will

Unit Defect

5 4

each

list

DEFECT

defect address will

be

issued

must

as

be

in ascending order.

Media

RESERVED

RESERVED

RESERVED

LIST

LENGTH: N BYTES

action will begin

2.3.3.2

for

description of the

during the data phase

This

number

one

defec~.i

Each

four byte entry

Significant byte

always

soon

as

the complete

List

2

until'

must

ye

first)

be

o

ending

be

divi-

block

minimum

of a
zero for
list

ad-

has

00

01

oz

03

The

defect

The

list
fects
value then will
value
default

media

list

of defects will

may

be

flagged during

be

on

the Z-tracks of the

to

an

interleave

minutes, depending

in the defect

list.

00701300-000
15

December

1984

2-20

REPEAT

N/4

TIMES

MSB

LOGICAL

LSB

LOGICAL

must

be

in ascending order.

be

f1aqqed

verification)

specified in byte

cartridge.

of one. This process will take

on

the condition of the

WITHIN

THE

RESERVED

RESERVED

BLOCK

BLOCK

and

04

DEfINED

LENGTH:

ADDRESS

ADDRESS

the

media

and

of the

verified

reformatted.

command

to

A value of zero in

media

and

the

(additional de-

The

interleave

set

the

interleave

this

between

number

byte will

1.5

of

and

5

entries

:th'e'

·c()nt·r·oll~'r.

complete;
QUEST
error
will

.,.t.her.e

,,..avai

SENSE

occurs duri

be

returned.

..

are

".no

1 abl.e',:

·'wiii"·:be·:iri'·.'

no

additional-commands

may

be

..

the

ng

spares

,ppe.rat,'i

used

"~'"

to

defect

If

media formatting

,t.he

o~··"~.i..J.l

the

determi

fl

:

ctr.q.c~,

"'H'ard\tiare:

will

ne

aggi ng,

Wi

J 1

abqrt

•.

...

".

'B'lisy

be

the

the

requires

b~_f1.~gge9,

. .

state

accepted

success

b 1

o~k

•

untir"'the'Operat:ion'"

•.

After

of

the

number

,flagging

.'

.....

..If

.',

the

operat

of

of

no.,

sp.ar~

',.'

process,

i on.

the 1 ast

a

sector

....

t.r..acks.

If

defect

..

. .

..

;:s

RE~

an

and
are.

, ,

2.3.3.4.3

Setting
COB

will

to

the

are

transferred

s;

x bytes

Bits
pl ace.
cated

3 through 7

by

subsystem

ADDITIONAL

-------------------------

BYTE

00

01

02

03

04

05

Device-specific Implementation'

bits

be

ignored,

1,

is:

~T

FORMAT

---C--I--I--I--r---------

Z.~C~

---------------------------'

Starting

the

first

cuted each time

the

first

an

ILLEGAL

set

REQUEST

2,

and 4 of

and

to

control

durinq

COMMAND PARAMETERS

7 6 4 3 2 1 0

of

at

the

bit

will

the

FLAG

SECTO!..

DEFINITION

DEFINITION

IlEFINITION

DEFINITION

byte

bit

7,

bit

it

command

be

error

byte

the

host must send

five

data

FLAG

_T~K_

DEPENDS

DEPENDS

DEPENDS

DEPENDS

00

specify

the

finds

is

sent,

ignored.

will

be

01

means

vari

ations

phase

UNFLAG

T~C~

ON

OPERATION

ON

OPERATION

ON

OPERATION

ON

OPERATION

RESERVED

of

Z.TRACKS

SPECIFIED

SPECIFIED

SPECIFIED

SPECIFIED

which

controller

set

high. Only

so

any

If

none

indicated

that

the

REMAKE

of

will

by

the

six

additional

of

this

command.

__

IN

BYTE

00

IN

BYTE

00

IN

BYTE

00

IN

BYTE

00

the

five

perform

one

bits

of

in byte

the

the

interleave

command.

The

~S~E~

operations

the

operation

00

first

five

controller.

parameter bytes

format

___

operation
to

bits

of

the

These bytes

for

the

'

is

to take

indi-

will

the

bits

be

right

is

exe­set,

of

Definitions
eration
operations

of

the

other

being performed. These

follow.
Format Z-Track,
The

FORMAT

information

If

the
not spin
the

drive

Z-TRACK

on

Z-tracks

up

and

(including
been implemented
these
stay

conditions.

spinning

regardless

bytes in

this

definitions

Remake

the

become

Z-Track

operation

Z-tracks

unreadable

is

(see

continue spinning,

FORMAT

to

provide a

This

Z-TRACK).

operation

of the

six

byte extension depend

and

used

to

subsection

for

any

and

no

The

fai

lsafe

will

prior

cause the disk

contents

descriptions

change

the

2.3.3.3
reason,

operations

REMAKE

means

Z-TRACK

of
and

on

the

of the

five

cartridge-specific

and

Figure 18).

the,

cartridge

will

be

allowed

operation

data

condition

recovery under

to

spin

of

up

the

00701300-000

15

December

op-

new

will

on

has
and

Z-

1984

2-21

,tracks.

cord;

.

For

ng . to

these

command

'.

The·:

controller

spec i

__

-----------------WARNING------------------~

REMAKE
tracks •

tw·o··

fi

ed

Z-

TRACK

The

opera'tion's~

·thenwfll·.

par:-ameters. .

unf1

ags

user

is

responsible for

.

the····

'sfx:

att.~mptto

all

previously

b"y'te'

extenslc)ri'

r.ewri.te·

d~ta

trye

..

f1

agged

integrity.

of

·the·

~~~track$

·FORMAT.

..

9.C~·

UNIT

follows

The

six

ADDITIONAL

BIT

BYTE

00

01

02

03

COMMAND

1

FORMAT

--tt--f-

Z.TRACKS

",ST·WRITK

~!'.fN'i't.t<iK

I-OISAB&.K

-=--_--=-__=_

PARAMETERS

6

_0

_

ECC

O-KNABLK
I-OISABLE

RESERVED

5

_0

_

INTERLEAVE

_

--

1

~-.

-----------_._------------------

04

os

__

----------------WARNING------------------~

If

the cartridge

ECC,

ALL

stroyed.

FURTHERMORE:
enabled will

if

~CC

was

byte

extension

customer data

already enabled.

for

is

non-ECC

The

REMAKE

ALWAYS

this

destroy

case

4

_0

_

11.2.4.8.1&.

RESERVED

RESERVED

RESERVED

on

the cartridge will

3 2

.

REMAKE

--

Z.TRACKS

L

OR

r=

and

Z-TRACK

all

C

.

32

FOR10

MBYTE:

DWELL

is

comnand

customer data,

TIMER

to

is:

--------

__

~E~VED

1.2.4.11.

COUNT

be

changed

OR

34

(2·12

FOR

OR

___

10.5

15)

be

with

even

o

_

MBYlE)

.-==

to

de-

ECC

ADDITIONAL

BIT

BYTE

00

01

02

03

04

os

•

FLAG

Flag
The

rep

Sector,

FLAG

1 acement of defect·;

00701300-000

15

December

2-22

COMMAND

· 1

---------

SECTOR

SECTOR

1984

RESERVED

ONL

Y

Flag Track

PARAMETERS

6

A

•

SECTOTA.

and

FLAG

5

TRACf

LOGICAL

LSB

LOGICAL

RESERVED

TRACK

ve

4 3 2 o

•

=:J.

--------------

BLOCK

ADDRESS

BLOCK

operations

areas.

on

•

MSB

LOGICAL

ADDRESS

the

::::I_-=-

BLOCK

ADDRESS

provide a

d;

sk.

In

RESERVEO

means

each

::-

case,

~

::.

for

logical

the

bad

areas' are rep

data block will

place.

The

,.-aced····\-iith

automatfc~lly

host

is
data bytes are not
maintenance of data

.and/Qr

,

.us~.r

...

~

________________

;spare's'~'an'd

..

any'

'fur"fher"

reference the spare block' assigned in

not required to

moved

integrity

from

the defective block-to the spare,
under these operations is

WAANING

keep

a defective block

__________________ _

accesses "lo'

up

the·fl

agged'

its

table.

so

Th~

the

to the host

Since data bytes are not

'ation,

the

host

integrity.

ouri

ng a FLAG

sector

10

copied .into the sector

field

SECTOR

operat i on, a

of the defective

10

maining unflagged sector

over
responsible for
this
tion
track,

pletion
no

track should
The

(bit/1=1 in ending
gedc
set,

for

special
AD
be
byte
track

ror
operation should take
tai

one

sector' position to allow

moving

track physically following the flaqged

takes

or

pl

ace.

an

10

c.annot

in the ending

If

be

status

other spare sectors are

be

flagged.

REQUEST

SENSE

command

status)

If

the

error

was

due

the logical block address returned should

the

FLAG
error

VALID

sent

04

should

as

did not occur

SECTOR

class

bit

is not

as

the address for the

be

command.

and

set

set

indicating

the logical block address to

and

the

pl

n.

transferred

is

responsible for maintaining

hex

FO

sector,

field

IDs

of the next unflagged

through the

room

for

the data for the flagged

no

other spare sectors are avai 1 able

wri

tten,

byte

·av

ai 1 ab

should

the
(bit

1 e (vi

be

issued

comnand

1=1). After
aa

to determine the disk location to

to a

code

If

media

the

problem

error

are returned

in

this

pattern

and

the original sector

is

oper-

wri

sector.

end

of the track are

this

operation.

sector,

sector,

after

returns

verification

REQUEST

after

and

occurred

(10

Hex).

every

the

be

SENSE

AD

sent

on

In

data

tten

The

and

this

an

abnormal

conmand),

check

VALID

as

an

ECC

this

into the

10

The

all

moved

host

sectors

opera-

on

condition

be

flag-

bit

the address

sector, a

case, the

but the logical block address returned should

FLAG

that

AD

VALID

ace

since the exact

SECTOR

it

be

bit

is

command.

is

the

flagged.

not

set,

error

Al

so,

'bit

ECC

sector

If

an

no

on

ECC

sector

sector flagging

location is uncer-

7

the

is

re-

is

on

that
com­that

the

was

of

same

er-

For

FLAG
written
part

TRACK

on

of the

the Z-tracks. This information

startup
spare tracks are avai 1 able
updated for
controller.

some

The

track being spared .

. Unflag Tracks

Issuing

an

UNFLAG

will unflag all flagged tracks

be

will

-----

written in the Z-track locations, thus clearing the

----

-------

--------------------

operations, the defective track

is

sequence each time a

on

the ·cartridge or the Z-tracks cannot

reason,

an

error

condition will

cartridge

logical block address given

TRACKs

operation

on

as

part of the

the

cartridge.

list

read

may

for a cartridge

by

the

controller

is

inserted.

be

reported

fall

anywhere

FORMAT

An

UNIT

FOFO

hex

bad

00701300-000

.

15

December

is
as

If

no
be

by

the

on

the

command
pattern

track

1984
2-23

table.···

.host

tension

..

Sin~e··

is.

responsible

to

'the

data·

format

byt-es.are·.

for

maintaining

unit

command

not

..

·.transferred
data

'for

integrity.

this

i·n.

thls·

operation

operation,

The

sfx

is:

byte

..

'ex:"

the

2.3.3.5

ADDITIONAL

BIT

BYTE

~

_______ L ________

01

02

03

04

05

COMMAND

7

..

..

'

<~r'7I"

PARAMETERS

&

5

~I'UNruGT--;~'-'-'

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

Format Track Command

COMMAND

BIT

BYTE

00

01

02

03

04

05

7

o

VU

8

LUN

4

!~~_I

5

o

4

o

LOGICAL

LSB

LOGICAL

3

____ l _____________

3

BLOCK

ADDRESS

BLOCK

ADDRESS

RESERVED

MS8

2

2

LBA

-.

'RES'ERV;;-'-'

o

-'-'.-.

LINK

'.-.

_

o

o

The

FORMAT

matting

rather

quenced,

sequenc.e

than

the
identified
spared.

of

this

Recovery

command

2.3.3.6

COMMAND

BYTE

00

04

05

00701300-000

15

December 1984

2-24

TRACK

defects.

with

track

command

similar

the

entire

checked

If'

of

user

allows

to

for

no

spare

data

the

the

FORMAT

media.

medi a

for

sectors

this

begins.

Reassign Blocks Command

BIT

7

a

VU

&

LUN

5

o o

host

to

initiate

UNIT

The

defects,

track

4 3 2

RESERVED

RESERVED

RESERVED

conmand,

track's

are

available,

is

and

not

sector

sectors

possible

RESERVED

a media

but

on

IDs

the

checking/for-

a

track

will

spared

.track
once

be

for

will

execution

o

LINK

basis
rese-

any

be

The

REASSIGN

. affect:ing

SECTOR
fect

media

2.3.3.4.2

·th~·.:

command,

list

for a description

assigned using

:

:NOTE':-

'.

Therefore,

BLOCKS

integri

command

allows

ty··af. any :other.· ·b·lack

which

does

a'lter

is' sent during'

of

other

the

this

the

host

blocks

data

'phase of the'

list).

spares.

l:he····

ab; 1

ity'~

of' ·:the. ·subsystem·'to··

blo'c~

....

;:s

......

ba·s··ed.'·:on'

two

logical

:'''fragg';ng~

blocks
each block address passed in
the
higher .logical block also
the
1
dresses
the

address

.address

09i cal block

of

a physical

controller

is

is

al

an

an

odd

so

will

even

numbered

will

numbered

wi

11

be

reass

sector

not reaSSign twice.

to

spare media

s·.

·on.·

tl1e;

dev.i

ce·

on

the

same

command

The

~

':a:"

will

the

be

specified

"512"

:byt'e:'

be

reaSSigned

defect

block,

reassigned. If.

blocks

reass

ign.-' a .'.

"'secto'r;~'"

list.

the

block, ·the next lower

i qned.

are in

the

If

both ad-

defer.t

list,

defects

(un 1 ike"·;

track).

without

the·.

The

(see subsection

will

be

'.

for

If

next

FLAG,

de-'
re-

2.3.3.7

The

READ

to

the

COB;

and

2.3.3.8

Read Data Command

COMMAND

liT

IYTE

00

05

DATA

host.

the

__

7

LOGICAL

YU

command

The

number

---------------------WARNING------------------

If

byte

&

UNIT

NUMBER

initiates

starting

of

blocks

04

is

Write Data Command

COMMAND

BIT

BYTE

00

01

7 &

o

LOGICAL

UNIT

block

0,

NUMBER

5

o

LOGICAL

LSB

LOGICAL

NUMBER

to

then

o

LOGICAL

4

o

BLOCK

ADDRESS

BLOCK

OF

BLOCKS

a

transfer

is

specified

be

transferred

256

blocks are

4

o

BLOCK

ADDRESS

3

MSB

ADDRESS

2

LOGICAL

IL~CK

of

data

by

bytes 01, 02,

is

transferred.

1 z

MSI

LOGICAL

BLOCK

o

ADDRESS

LINK

from

the

disk subsystem

and

given in byte 04.

__

o

o

ADDRESS

03

of

the

05

YU

LSI

LOGICAL

NUMBER

OF

BLOCK

BLOCKS

ADDRESS

LINK

00701300-000

15

December

1984

2-25

The·,

'disk

and

by

byte 04.

WRITE.·

subsy'stem~

03

of

DATA

the

COB,

command i ni

'.

'The

startfng'

and

r----------WARNING---------w

,If

,byte

04

,the

is

t.i

ates"a

number

0,

then

,transfer.

of.

'data

,'from,

bi6ck address -'{s' specified

of the blocks to

256

blocks.are

be

transferred

transferred~

the,

'by

bytes'at,.

host. to the

'02'~

is

given

2.3.3.9

The

SEEK

Seek Command

COMMAND

BIT

BYTE

00

01

~---;----------

02

03

04

05

command

7

o

LOGICAL

VU

requests the indicated drive

8

UNIT

NUMBER

5

o

LOGICAL

LSB

LOGICAL

RESERVED.

4

o

----------------

BLOCK

ADDRESS

BLOCK

3 2 o

MSB

LOGICAL

ADDRESS

ing the specified logical block address. This

the

REZERO

UNIT

command.

(See subsection

2.3.3.2.)

2.3.3.10 Inquiry Command

BLOCK

ADDRESS

LINK

to

seek to the track contain-

is

an

off-line

command,

like

COMMAND

o

LINK

The

tion

BIT

BYTE

00

01
02

03
04
05

INQUIRY

vu

command

6

LUN

requests the

to the host. This can.

5

o

be

NUMBER

used

4 3

RESERVED
RESERVED

OF

BYTES

REQUESTED

controller

to

z

RESERVED

send

device-specific

to allow device-independent software to
adapt dynamically to the available hardware. Although only the
returned parameter bytes
transfer
of-

zero

the

is

number

given.

of bytes requested, but will return

currently

have

any

meaning, the

controller

no

bytes

00701300-000
15

December

1984

2-26

informa-

first

if

a count

six

will

RETURNED PARAMETERS

aiT

BYTE

"'-'j-'

' .

.00

....

.-.:.

01

-

0%

-

~

04

;:-

...:.

--

------_._-.-.

.

'--.--

-------------------------

--------------------------

1-

';;;;R;;;

__

--

-L

------------------------------

&

..

-

TR;;;VED',

__

5

---~.-

0

______

t-10.0-r;:;II:;;-E;;;;;E~I~;;.;T.;;;r

..Lt):o1D.:L~~E~E~II~S~U~__

ADDITIONAL

4

-" -.....

DEVICE·TYPE.CODE

...

~-' . ....:..;:..~----------

DEVICE

TYPE

SCSI

REVISION

~ESERV~

ADDITIONAL

UNIT

3

-

.. ~-..

(DOt

QUALIFIER

LEVEL

(00)

____

LENGTH N BYTES

PARAMETER

%

-.~~.---

.

------

-'-I-;-

BYTES

__

o

.. -..

.

IRESER-;;';-

_

__

-.

Device type

80

(hex) for a removable device without user assigned codes. Revision level

is

currently

05. Byte
unit
board

2.3~3.11

parameter byte contains the

as

code

04

indicated above.

NOTE:

the

The

that
A
on

Start/Stop Command

COMMAND

BIT

BYTE

00

01-

t - -

is

00

for a

00

for

unspecified. Zeroes will

contains a count of the additional bytes requested.

Th

is

command
UNIT
controller

;s

00

will

the

0

ATTENTION

'not loaded

be

controller.

6

LUN

direct

cannot

returned in byte

access device. Device

current

does not check

status,

distinguish

and

a drive

4

be

switch

for,

nor does

between

that

00

for

RESERVED

returned in

settings

nor

it

cl

;s

not

any

LUN

% o

-r-------- -----------

~

03_1

04

05

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

_________

t-

~E~D

RESERVED

_______

Qualifier

any

on

report,

ear

it.

a drive

present.

queried

_

FLAG

REQ

bytes

the

IMM

--

'-START
O-STOP

LINK

The

code

digital

is

after

first

The

START/STOP

specified
fied
will spin
cal
will

REMOVAL

drive will spin

and a cartridqe

keep

drive

down.

flashinq

command

command

be

The

with a

allows the host to request

spun

and

up

or

downo

up.

drive cannot

loaded.

If

bit 0 of

The

the bezel

STOP

command.

If

bit

byte

be

spun

drive will spin

is

still

0 of byte

04

is

up

if

the load lever

locked

that

zero, the specified drive

down,

when

the spindle of the

04

;s

one, the speci-

is

not

but the green

using a

PREVENT

00701300-000

15

December

verti-

light

MEDIA

1984

2-27

As

with

spin
this
will

zero,

.

.If._

up
command
be

the

bi,t

.1.

·-·;-s·.zero,-·'

loading. a 'cartridge,:the
the

drive.

on-1

executed

command

of.

byte

dwelf

seeks are. 'enabled"., . .

~

________________

For

in·e

or off-1

off-line,

will

.05

be

.i.s

this

reason,

ine.

freeing

executed

one,. dwell seeks., are

"controller'

the

host

If

bit 0 ·of

the

SCSI

on-line

WARNING

(and

__________________

may·

require

is

given

byte

bus.

If

also

,91sa~led

'several-seconds

t~e

01'

is

bit

tie

up

.. , ,I.f

choice of doing

one, the·

0

of

the

SCSI

.bit 7 of

byte

,byte

command

01

bus) •

".

_

-

.to

is

05

-'

The purpose

life.-

By

of

the

disabling

dwell seeks

dwell

shortened.

2.3.3.12 Send Diagno.stic Command

COMMAND

The

SEND
routines
will

go
sued as
Any

other

BIT'

BYTE

00

05

DIAGNOSTIC
described

off-line

·shown;
configurations

7 &

o

VU

Command

in

until

the

other

5 4

o

LUN

allows

subsection

the

diaqnostics

SCS I opt

will

generate

DATA

DATA

the

3.3

ions

is

to

extend media

seeks,

RESERVED

VARIABLE

VARIABLE

host

on

the

media

3 2

LENGTH

MSB

LENGTH

LSB

to

specified

life

invoke

are completed. Byte

for

th

i s

command

an

Illegal

Request

the

LUN.

may

be

o

o

o

startup

are·

o

LINK

diagnostic

,The

02

must

controller

not supported.

error.

be

is-

2.3.3.13

The

PREVENT/ALLOW

of

the

or

packing

controller

Prevent/Allow Media Removal Command

COMMAND

BIT

BYTE

00

os

cartridge

the

not

00701300-000

15

December

2-28

to

1984

7 &

o

VU

MEDIA

at

an

files

poll

LUN

REMOVAL

undesirable

on

the

device.

the

bezel switch

o

command

4 3

RESERVED

RESERVED

RESERVED

allows

time, such as

This

command

on

the

specified

2 o

o

RESERVED

FLAG

REQ

the

host to prevent removal

when

updating a

works

by

drive.

LINK

instructing

The

directory

the

command

wi

11

remain

power-on

If

bit 0 of

byte

04

reset

is

zero,

in

-'effect

occ~rs.

byte

04

media

'unti

is

one,

removal

T .

eX'pl

media

i"ci

will

tTy'

enabled'~'"

removal

be

enabled.

will

'or'

'lint

be

inhibited.

i'f'

a··;·.ho's·t·'reset-

If

bit 0 of

"'or';

2.3.3.14

The

ten byte

and

.b1ock
transfer
08

is

00,

If

byte

the

last

The

block-

(an

SCSI

returned

Read

COMMAND

BIT

BYTE

00

09

size

wi

11

the

08

Capacity Command

7

o

VU

READ

CAPACITY

of a unit

encounter a substant;

address

is

one,

logical block

size
option),
by

this

for

an

command

8

LUN

5

command

and

also to determine track boundaries,

and

this

this

size

command

on

the

device

of the

same

Invalid Request

is

as

follows.

4

o

LOGICAL

BLOCK

LOGICAL

BLOCK

LOGICAL

BLOCK

LOGICAL

BLOCK

RESERVED

RESERVED

PARTIAL/FULL

3 2

AODRESS

ADDRESS

ADDRESS

ADDRESS

MEDIA

INDIe.

RESERVED

MSB

LSI

allows the host to determine the

al

de 1 ay
last

will report the address

physical track

;s

always

error

for a seek to occur.

block

on

the drive

and

as

on

the specified block.

256.
will

If

bit a of

be

issued.

o

LINK

capacity'

where

If

is

reported.

block size of

byte

The

01

is

data format

data
byte

set

RETURNED PARAMETERS

BIT

BYTE

,--

00

01

02

03

04

05

06

07

-------------------

8

4

LOGICAL

LOGICAL

LOGICAL

LOGICAL

BLOCK

BLOCK

BLOCK

BLOCK

BLOCK

ADDRESS

BLOCK

BLOCK

BLOCK

ADDRESS

SIZE

MSI • ALWAYS

SIZE·

ALWAYS

SIZE·

ALWAYS

SIZE

LSB·

3 z

MSB

ADDRESS

ADDRESS

LSI

0

0

1

ALWAYS

0

o

00701300-000

15

December

1984

2-29

2.3~3.15

. :-Extended

COMMAND

BIT

BYTE

Read·

7

Command

6

5

4

3 2

o

00

..--

·01

..

02

03

04

07

08

09

The

EXTENDED
provides for
256

biocks. This

starting

block address

block count

data

is

bytes are

set

(an

SCSI

o

._'--

--------

-------------------------

VU

READ

larger

is

gi
transferred,

option),

'LUN ;

command

operates the

capacity devices

command

ven

in bytes

initiates

is

specified

and

an

Ill~gal

-_-....._-------_.

LOGICAL

LOGICAL

LOGICAL

LOGICAL

NUMBER

NUMBER

07

and

no

o

BLOCK

BLOCK

BLOCK

BLOCK

RESERVED

OF

BLOCKS

OF

BLOCKS

same

and

also permits requests for

a

transfer

in

08.

error

Request

.

RESERVED

ADDRESS

ADDRESS

ADDRESS

ADDRESS

MSB

LSB

COB

If

is

reported.

error

MSB

LSB

as

the

o

READ

DATA

o

LINK

command,

more

of data to the

bytes

02

through

host.

OS,

and

zero blocks are requested,

If

will

be

issued.

bit 0 of

byte

but

than

The
the

no

01

2.3.3.16

The

EXTENDED

Extended Write Command

COMMAND

BIT

BYTE

00

08

09

WRITE
but provides for
than

256

blocks. This

7

o

VU

command

larger

6

5

LOGICAL

LOGICAL

LOGICAL

LOGICAL

NUMBER

NUMBER

operates the

capacity devices

command

initiates

4

o

BLOCK

BLOCK

BLOCK

BLOCK

RESERVED

OF

OF

ADDRESS

ADDRESS

ADDRESS

ADDRESS

BLOCKS

BLOCKS

same

and

a

3

RESERVED

MSB

LSB

as

2 o

MSB

LSB

•

does

the

RELATIVE

WRITE

o

ADDRESS

LINK

DATA

also permits requests for

transfer

of data

from

command,

more

the host.

00701300-000
15

December

1984

2-30

,The

..

star.t.tng:
b16ck
data

is

count

bytes

set

·2.3.3.1-7

(an

SCSI

COMMAND

BIT

BYTE

;·b.l

ock ····address··

is

given in

are

transferred,

option),

7

bytes

8

an

·i·s.·

..

specified'

07

and

no·

Illegal

and

Off.

error

Request

4

in·

the'

CDB····bytes·

If

zero blocks are

is

reported.

error

3

will

2

If

be

:02.'-05';'

requested,.

bit

a

issued.

'and···the·

of

'byte

0

no

01

00

01

02

0 0 0

-------------_._--------

os

06

07

08

09

The

WRITE

AND

mand, but provides,

fer

of

data

bytes

zero

02

through

blocks are

reported.

quest

error

VERIFY

from

If

bits

will

VU

requested,

be

LUN

command

post-write

the

host.

05,

and

0

or 1 of

issued.

operates

CRC

The

the

block count

no

data

byte

RESERVED

-------------

LOGICAL

BLOCK

ADDRESS

LOGICAL

BLOCK

ADDRESS

LOGICAL

BLOCK

ADDRESS

LOGICAL

BLOCK

ADDRESS

RESERVED

NUMBER

OF

BlOCKS

MSB

NUMBER

OF

BLOCKS

LSB

the

same

checking. This

starting

bytes

01

block address

is

gi

are

is

set

(SCSI

MSB

LSB

as does

command

ven

in bytes

transferred,

option~),

the

WRITE

initiates

is

specified

07

and

----

RELATIVE

ADDRESS

----

LINK

and
no

an

Illegal

DATA

a

trans­in

08.

error

com-

COB.

If
is

Re-

2.3.3

..

18

The

READ

a

CRC

Read Long Command

COMMAND

BIT

BYTE

00

01

02

03

04

05

LONG

error

7

VU

command

is

encountered.

6

LUN

functions

4 3 2

o

LOGICAL

LOGICAL

BLOCK

NUMBER

identically

If a CRC

BlOCK

ADDRESS

OF

BLOCKS

error

LOGICAL

BLOCK

ADDRESS

LSB

to

the

occurs using

ADDRESS

READ

MSB

DATA

the

15

o

LINK

command,

standard

00701300-000

December

unless

READ

1984

2-31

,DATA,

be

Using

then ending
countered,
The

"ror

,

'comm·and.

command~

'u'sed'

if

this

the' ho'st'

command~

status

the

host

occurs~.

is

responsible
this.

the

data

,w.i.ll not,

is

if

an

will

command

com~and.,w-.ill,

will

2.4 POWER INTERFACE

be

returned

'to,

the

capab'l'e of determinatin'g't'he

error'

be

sent with the check

for

occurs, the ,data will

be

aborted

correction

fU,nct.jon-

after

or

integrity

..t,hes,arne

bit

sending

.~.s..,does,

host.,

Thi s ,command

usefulness"of'

be

passed to the

set.

of

If

an

the

suspect data block.

the

data.

~he

,usuaJ

'can

'the"

data.'
host,

error

If

is
no

en­er-

·READ:,DAT.A.

Power

in Table

watts

the

Table 1

the

have
maximum

amps

supply
(single

drive

lists

different

1.
in a

current

The

drive

rapid

the

operating

instantaneous

drive

for

approximately 4 sec

requirement.

requirements

subsystem has a

and

random

Single Drive

+5
±.5%

Ripple
+12

±.5% '

Ripple

maximum

peak

(10 msec) are requi red

the

sidered in

selection

controller).

seek

mode.

MAXIMUM

with

Controller

1.5 amps (avg)
mv RMS

30

1.5 amps

mv RMS

60

1.5 amps peak 1.8 amps (avg)
120

(avg)

3 amps
25%

300

current

modes

of

requirements of

In

particular,

from

for

a seek. These

of subsystem

for

the

drive

maximum

continuous

This

maximum

Values are

TABLE

POWER

mv

duty

mv

1

REQUIREMENTS

p.p

p.p

30

2.0 amps

cycl.e

60 mv RMS 300

requirements

the

drive.

sufficient

the

+12

vdc

power

and

controller
power

can

shown

Two

Drives

with

Controller

1.8 amps
120

mv

3.5 amps

mv

each supply voltage

that

mv

One

RMS

(avg)

from

Note

duration

disk spin-up

supply. Also

peak

requi rements

supplies.

are

detailed

consumption of

be

achieved only with

in Table 1.

pea

k

p.p

pea

k

P-P

certain

requires

to

up

must

specify

to

operations

up

1.4
be

to

25

for
the

1.S
amps
con-

Active seeking or
time. Because of
drives,

than

for

power

the

requirements

initial

track

this

system.

following

and

00701300-000

15

December

1984

2-32

can

because

for

each additional

take

one

pl

ace only

controller

drive

on

one

drive

board can control

are

significantly

at a

two

less

"·3.0

OPERATIONAL ·INFORMATION

This 'manual'

subsystem.

the

drive

,·,Contro 1 s

,

..

switch·;··:·a:·mQtor·.';loading·.';lever·~,;·

along with

face,

this

3.1

power

sectioD.

CARTRIDGE

Proper use

vatio~

of
moval

3.1.1

The

time

of

the

manual

procedures.

cartridge

the
cartridge
the

front

improper

Bernoulli

access

to

section
Cartridge

contains

loading, handling,

are explained.

for.operating

the

cables

supply,

and

care

data

integrity

deals

Loading and Removal

may

motor load

containing

of

the

cartridqe

plate
the

will

disk.

..

the

subsystem

and

connectors needed

and

the

USE

of

the

subsystem

and

with

be

lever

dri

cartridge

inserted

is

the

access door should face toward

ve

(see

insertion.

~nteract

fnf6rmation~needed

write

i.nclude.·a~cartr.idg~,··remova

·and:··.·t.wo···.I.:.ED.~:tndi:c·ators:~·~··~

controller

to

drive

cartridge

assurance of long

loading,

into

parallel

Fi

gure

with

As

the

to

20).

the

and

drive,

the

Interlocks

cartridge

open

to

ope'rate

protection,

for

the

host-to-subsystem

interface

are importdnt

cartridge

handling,

access door

drive

opening.

is

the

access door, thus providing

the

disk

and

removal

1 push

..

These·:·:tomponents';'"

are described in

for

the

life.

write

the

in

the

inserted,

This

protect,

end

first,

The

edge
stop button
system prevent

keys

storage'

from

..

button
inter-

preser-

portion
and

re-

any

of

the

on

on

the

...

Once

load

loaded
blink.
drive

To

gin

the

to

and
If a command

BUSY

recei

down,

error
for

the

cartridge

the

motor

the

motor,

At

this

motor reaches

remove

to

green

unload

the

the

bl

ink

LED
the

cartridge

status

ved

by

an

error

speci

the

fi

user.to

and

cartridge,

as

turns
motor.

requiring a drive

will

the

ed

minute (depending

a

command

motor

by

comes

locking

up

to

host.

is

in pl ace,

initi

the

time a

ate

green

latch

operating

push

the

motor

off

and

At

this

removed.

be

reported

subsystem

st

atus

wi

11

in response

remove

upon

the

system

the

speed,

the
drive
LED

on

pin

speed
the'

stop

spins

the

down.

latch

time

to

spin

and

the

from

be

reported

the

to a request

cartridge.

activity),

load

of

lever

course,

load

spinup.

the

will

the

engage

green

button.

When

pin

the

lever

up

drive

host

After

and

BUSY

lever

front

may

When

of

the

to

LED

will

The

the

motor has

will

or

wi

sense

may

down

will

direct

th

Cartri

disengage

be

is

spin up.

1 y
command.

a time delay of

the

spun

spinning

down

the

status

be

turned clockwise

the
lock

green

·lever
dri

the"

glow

has completely

ve

wi

11

leverQ

steadily.

LED

then will be-

come

to

to a stop,

allow the

begi n

As

lever

turned counterclockwise

received

from

the

host,

If a corrmand

after

dge

wi

11

a dr i

Not

drive
drive

be

ve

has spun

Loaded

Thi

s allows time

10

seconds to 1

will

respond

motoro

reported

as

As
to

00701300-000

15

December

to

to

the

is

the

to
the
the

1984

3-1

~--------~--~---WARNING----~--~--~--~~

If

the·

cartridge
orientation·
tridge
the
damage

.facturer1s

...

into

cartridge

may

. ;

:'

and
the

result.

warranty

.......

is

try

drive.

opening

Such

•

.

difficult

again.

Do

in

front

action

t.o·

00 not

not

insert
will

insert,

of

force

objects

the

drive

void any

check

the

manu-

its

car-

into

since

3.1.2

Although the
vation of

Handling

the

•

Do

side.. the

•

Do

not

•

Remove

protective

•

Do

not exceed temperature or other

or

storage.

•

Do

not expose the

•

Do

not expose the

oersteds

•

·Protect
ments. .

•

Avoid
be

transterred

cartridge

following

not

try

to

drive.

insert

the

cartridge
jacket.

.

the

handling the

protects

cartridge

open

objects

cartridge

the access door

cartridqe

cartridge

front

from

the

the disk

into

from

from

hand

from

handling

the

the drive

to

to magnetic

dirt,

edge

to the Bernoulli

rules

when

front

direct

spills,.

of the

slots

after

specifications

most

sunliqht or moisture.

accidental

is

still

the

cartridge

of the

use

fields

and

cartridge

plate

damage,

i~portant.

is

cartridge.

and

store

in shippinq

greater

harsh environ-

since

or

in

than

oils

disk.

obser-

out-

its

30

may

CARTRIDGE

00701300-000
15

December

3-2

MOVE SWITCH TO THIS

. POSITION FOR

WRITE"\

@#

-_

Figure 20. Cartridqe with Write

1984

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

~---.

~

~

SWITCH SHOWN

1 WRITE PROTECT POSITION

Protect

Switch

~

J

3.1.3..

The
picteq
closest
time the

3.2 OPERATOR CONTROLS

The

a motor load

ors are located

..

Write .protect.- " .

write

protect

in Figure 20.

to

the

edge

cartridge

ope~ator

interface
lever,

on

switch

of the

is

is'

The

cartridge

cartridge

out of the

of the subsystem

and

two

LED

the

front

located

drive.

indicators.

of the

on

'.one

corner"--of the

is

write protected

as

shown.

is

made

The

drive~

The

switch

up

of a

switch,

cartridge

when

may

push

button switch,

lever,

as

the switch

be

moved

and

indicat-

de~

"

is

any

3.2.1

A

push
tridge.
eration-

pin

to

unload the motor. ' .

3.2.2 Load Lever

The

from
clock'wise,
ed, a switch
At

this

Stop Button

buttori switch

Pushinq the button

and

stop the. spindle motor.

that

locks the load lever will disenqaqe

load lever

being

removed

it

allows. the motor to load.'

is

time a latch pin

is

used

t~

stop the disk

signals

is

used-

to load the

while the

motor

closed to signal the

is

engaged,

the

controller

Once

motor

is

spinning.

When

controller

which

and

allow

to

the

motor

and

the lever will

and

also to prevent the cartridg'e

As

the

motor

that

removal

finish

has

stopped, the latch

of the car-

the present op-

the lever

is

completely

the

,motor

prevents the load lever

ing turned counterclockwise (and unloading the motor) while the
spinning.
the

cartridge

tridge

3.2.3 Indicators

from

The

is

being

lever

fuJly

removed

is

constructed to

inserted into the

until

the motor

interfere

drive,

has

and

been

with the

cartridge

also to prevent the

unloaded.

become

is

rotated

is

loaded.

from

motor

unless

free

seat-

be-

is

car-

The

green

tridge

LED

is

inserted

on

the front of the drive

will begin blinking to

the

mot~r

to

signify

ed

period, a dwell timeout

at

half

ition

motor

spins
lever

The

red

speed

speed.

from

is

at

down

to

allow the

LED

that

half

either

and

will

is

at the operating point the green

the drive

The

to

full
full

then turns

cartridge

glow

and

the load lever

signify

is

ready.

may

green

[ED

speed.

or

half

off

to

whenever

is

the

READY

is

rotated clockwise, the green

that

occur,

the

motor

If

the drive

which

is

coming

is

causes the drive

will blink momentarily

If

the stop button

speed, the green

as

the latch pin disengages

be

unloaded.

the drive

is

actively

is

LED

indicator.

up

~o

LED

not

will

used

glbw

for

motor

as

it

makes

pushed

while the drive

will blink

from

servicing a

15

When a car-

speed.

When

steadily

an

extend-

to spin

the

trans-

as

the

motor

the load

command

.

00701300-000

December

.

1984

LED

3-3

3.3"

.....

ST

.,

__

-----------WARNING'---------~-----_

Do

not

,

green

result.

ARTU,P

.

attempt

LED

is

DIAGNOSTICS

:'..

to

turn

glowing,

..

'

the

since

load

mechanical

1 ever,

whi

binding

1 e

the

will'

Upon

RAM

system

and

ROM

powerup

and

wi

11

the i

nterf

ace

contro

11

er

wi

veri fy proper buffer operat ion.

proximately 3 seconds. After completion, control

mal

operating firmware

If

a

failure

occurs during these

will not respond to a

on

the diagnostic display.

01

02
03

If a more
the read channel
these

tests.

ROM

CRC

--

RAM

test

--

Interface

extensive self-check

and

The
user data untouched.
second

test

host via the

mately

dent

10

tests.

1.

if

switch 3

SEND

additional seconds to complete

.

Seek

Test

to

begin execution of

initial

test

select,

failure

and

the following

failure

(buffer)

read/write

.test

is

desired, additional diagnostics

capability

failure

read/write diagnostics

The

diagnostics will

on

SI

is

in

the

DIAGNOSTIC

--

Check

command.

various seek

commands

tests,

of the drive

use

areas

be

invoked

ON

position
These

and

perform the following indepen-

profiles

11

perform a self-check

Thi s test

is

turned over to the nor-

from

the

error

on

the host.

controller

cJdes

can

may

be

the Z-tracks, leaving

following the

or

upon

request

takes

interface

be

reported

that

check

appended

normal

from

diagnostics take approxi-

and

directions.

on

ap-

to

3

the

2.

CRC

Check

3.

Overrun

4. Data Sync/ID

5.

If

code

an

6.

7.
error

will

Data

Data

ECC

Pattern

Pattern

Check

occurs

be

written to the diagnostic display.
of a diagnostic
next
error
REQUEST

command

(bit

SENSE

will

1 hfgh).

command.
because of the
teed.

00701300-000

15

December

1984

3-4

--

Check

in

failure

be

aborted, with completion

failure

Verify proper

--

Verify proper overrun detection.

Sync

Check

--

CRC

error

Verify

detection.

that

data

detected.

Read

Write Tests

Verify proper

Tests

--

Read
from

--

ECC

any

of these diagnostic

when

it

attempts to issue the next

and

compare

the Z-tracks.

Write various

Z-tracks.

write

Read

and
tests,

status

The

specific

Subsequent

of diagnostic

error

code

commands

tests,

wi

the

11

and

ID

sync

various data patterns

test

and

read

patterns

compare.

capability.

the corresponding

The

host will

indicating

can

be

determined

be

accepted

results

cannot

errors

be

informed

command

..

an

execution

vi

norma

11

be

are

to the

error

This

a the

y, but

guaran-

ADDRESS SELECT JUMPE

J3.

DISPLAY CONNECTOR

DIAGNOSTIC

HOST INTERFACE CABLE

J1CONNECTOR

JP~6

.

PIN 1

--H--~-AI/

ACTUATOR/SOLENOID CABLE

J8 CONNECTOR

J7 CONNECTOR

MOTOR CABLE

Figure 21. Printed

3.4.2 Drive Interface Cable

The

drive
the drive(
pin connector.
troller
plugging locations

interface
s).

to the

cable connects the

Each

last

sucessive drive

The

maximum

drive

34

and

43.

is

Circuit

Board

;s

recommended

1.0 m (3.3

~~~ffi:l-~:::::-)J1

J6 CONNECTOR
DRIVE INTERFACE CABLE

1

IN

and

Main

controller

attached to the

length of

ft.).

Cable

Locations

to the

same

this

The

cable

connectors are

interface

CONNECTOR

HEAD CABLE

board

cable

from

the con­keyed

of

by a 50

by

3.4.3 Power Cable

Power
connected to a

grounds should

to the subsystem should

common
be

ground

connected to a

possible. This wire should

mended

ft.)

power

exceed

grounding

or

less

applied,

0.06

scheme.

to minimize

dc

voltage

volts.

Where

line

00701300-000
15

December

1984

3-6

be

at the

be

at

possible cable lengths should

drop.

between

distributed

power

good

least

supply (Figure 23).

earth ground, using

14

Recommended

any

two

radially

with

gage. Figure

wire

grounds

size

in

the system should not

all

as

short a wire

24

shows

be

is

16

return wires
Power

supply

as

the

recom-

1.0 m (3.3

gage;

With

.r---------.

----.---.

-------l.

[.

I

I

'I'·

l

\

i

./

\

I

L~~:~),

~

I

L.:./

,/"

'"

. I • . . .

~

'.

. .

50

CONDUCTOR,

y"

HOST

.

POWER

COLORED

INTERFACE

914~(3&

.

CABLE

EDGE

CABLE

IN.)

~~~+12VDC

~

~

(not

supplied

8M

(20

(not

FTl

MAX

. . -I

~n

supplied

with

with

drivel

drivel

_____

~.

-\

.

GROUNDI

~+5VDC

I

I

I

'I

I

1

i

I

1 I

I

I -

~/

90~

.\.

201_

I

I

. I

I .

I

L

__

!oPTIONAL

'

\

I

I

I

L_,

_____________________

·_.

__ . ________________

SERVICE

TOOL

.'.

TO

ERROR

ON

LSI

BOARD

DRIVE

(not

ERROR

PORT

DIGITAL

INTERFACE

supplied

READOUT

with

.

CABLE

drive)

- -

HEX

DISPLAYS

ASSEMBLY

INI

§~~§§~~=~~~§~

~

COLORED

EDGE

4

CONNECTOR

(supplied

--

PIN

.

~

\ '

with

drivel

- - -

1

-----~.~

. I

--

--

-l

~

J

I

I

I,

I

.

Figure 22. Cabling

and

Connector Requirements

00701300-000

15

December

1984

3-7

SW1

SW2

SW3 SW4
OFF OFF
OFF
ON OFF
ON

SW5

OFF =

OFF = PARITY CHECKING

.

ON

ON

ON = REPEATING STARTUP DIAGNOSTICS
OFF = 10.0 CODE ENABLED

ON

MANUAL
(MUST

.. ~ .NQ·PARITYCHECKING

='

RETRIES ENABLED WITHOUT STARTUP DIAGNOSTICS

==

RETRIES DISABLED WITHOUT STARTUP DIAGNOSTICS

POWER-ON

BE

SWITCHED OFF

RESET

FOR

SUBSYSTEM TO OPERATE)

= RETRIES ENABLED WITH STARTUP DIAGNOSTICS

= 10.5

CODE

ENAB LED

o

o

o

DRlVE

o

POWER

DIAGNOSTIC

INTERFACE CONNECTOR J2

CONNECTOR

. PIN 1

CONNECTOR

o

+5VDC

J4

~

D

JP16
ADDRESS
SELECT

JUMPER • ADDRESS e

RN2

+5 VDC RETURN

VDC RETURN

+12
+12VDC

OPTION

HOST
INTERFACE
CONNECTOR

.

J1

TERMINATORS

SWITCHES

PIN 1

PI

N 1

--+;::;:::==3n:l}5;:-j

J8

PIN1-~m~

J7

L-

____________

(Actuator cables

Figure 23.

Digital

00701300-000

'15

December

1984

·3-8

PI

N 1

PIN 1

~~~========~~

ahd

jumpers

Controller

--f::ca~Eirl

r.=::::T!1:=:=----I-J3

..1'":

:~:

:r"T'I:

:1"'1"'1:

:~:

:~:

:;;;:

:~:

:~:

;:;: : ;:;: : ;;:::

Pii:

:1~O;d

J6

identified

Terminations

in Figure

and

~--PIN1

J2 }

DRIVE

LECT

PE

11/1

RS

SE

J4 J U M

21)

Address Options

POWER

SUPPLIES

+5VDC

,.

GND

.'

..

'"

"

~

+12

VDC

POWER SUPPLY GROUND

POWER SUPPLY

.

GROUND

HOST

ELECTRONICS

,

ELECTRONICS,

"

DRIVE'1

. '

GND

MINIMUM

EARTH

GROUND

GROUNDING I NSTRUCTIONS

KEEP GROUND WIRES AS

•

TIE

ALL

POWER SUPPLY GROUNDS

• CONNECT THE POWER SUPPLY GROUND
COMMON

• POWER
POWER SOURCE'

EARTH

TO

MORE

GROUND USING

THAN

NOT

ANOTHER

Figure 24.

LENGTH

SHORT

ONE

CONTROLLER

____________________________

AS POSSIBLE.

TO

A COMMON

MINIMUM

CONTROLLER.

Recommended

POINT

AND

THE

CHASSIS GROUNDS TO A GOOD

LENGTH WIRE.

SHOULD COME

Grounding

AT

THE

DIRECTLY

ELECTRONICS

DRIVE

POWER SUPPLY.

2

FROM

_

3.4.4 Diagnostic Error Display Port

A four pin
8

bit

error

Use

of

interface

If

an

shift

register
diagnostic tool for
format)

error

code

this

port at the diagnostic connector provides the user with

corresponding to the

port

is

especially

helpful in

development. Pin-out of the port

Pin

error

is

No.

1

2

3
4

is

discovered,

IC

is

available

necessary to receive the

use

with the port to display

from

Output

Ground

Clock

+5

vdc

Seri

al

Data

it

is

clocked

the manufacturer.

i nformat ion.

hex

error

codes

identifying

is

as

serially

bits

Appendix

listed

problems during

follows.

to the display

for display.

error

information

B includes ordering

15

in

Appendix

port.

An

optional

(in

00701300-000

December

an

A.

A

hex

1984

3-9

"3.4.5"

.'

Drive Addressing:

Three

nector
selection.
between

...

t~~.

The

row~

of

on

the drive

The

the upper

10w~r.

dri

.~t1d

...

ves

can

midQ.l¢.,r,ow.s

seven pins,

interface

seven position

and

middle

be

addressed in

each

.of.

located

just

above

board (Figure 23), control the drtve address

jumper

rows

:pi.n.s..·

..

any

of pins,

block

and

order but

selects

drive 1

no

dress.

3.4.6 Controller Addressing and Option Selection

The

eight position

the

controller
operation.
during device

The

selection.

shunt in place, indicating

sele~tion

Dip

switch

sequence (subsystem address).

S1·
These switches are
with

Bus
If

power

already

termination

more

than

one

provided at the

either

end,

resistor

bus

address shunt

board (Figure

shunt

bank

Only

is

used

to enable or disable various options (Figure 23).

sampled

on

may

not

is

provided

device

two

is

physical

pacs

RN1,

JP16

24)

must

allows user

one

out of the eight positions should

which

address

and

be

set

definition

line

only following a

have

by

any

resistor

effect.

pacs

connected to the

ends

of the bus.

RN2,

and

RN3

five position

up

correctly

must

power-on

RN1,

SCSI

should

the drive interface cbn-

drive 0

two

can

of the

be

reset.

RN2,

if

have

prior

controller

asserted during the

and

if

installed

the

DIP

switch

to subsystem

Changing.

RN3

(Figure 23).

installed

same'

bus, termination should

If

the

controller

be

removed.

is

between

ad-

S1

on

address

have

them

be

not at

a

00701300-000

15

December

3-10

1984

·

..

4.0. CONTROLLER ,OPTIONS

..

·

Subsystem

and

arbitration.

tration

The

subsystem supports

post-~rite

tions'invo1ve

Post-write

This veri-fication ensures

host
a

still

command

next track (whichever
written
this
be

The

operation

substantia.1 for multiple single sector

error
recovery
track,
the data
fective
head
some

for reading (unless

additional
track during a write operation
phase

hardware options are available for 'error correction

A description of the

is

now

in preparation.

two

levels

CRC
CRC

has

has

on

the

correction

if

a read operation

plus

all

from

sector

checking

some

overhead

causes the subsystem to
the data available, in case

been

completed, or

track during

is

one

the other sectors

the defective

and

flag

ti.me.

and

error

that

that

the user should

the write operation

whenever

comes

first),

this

additional revolution, or

code

hardware option

fails.

sector.

it

if

necessary.)

it

is

needed

for writes.

when

is

described.

ECC

follows; information

of

error

correction

correcti.on hardware options:

code

be

verify

the drive

command

data

any

retries

the

transfer
verifies

are readable.

40

transfers

is

a sophisticated system for data

A special, sector

on

the

same

(The

track,

host should then rewrite the de-

The

ECC

to recover data) but

The

following steps take place for

ECC

is

selected.

co"des

on

the

(ECC)

'.

Both

aware

on
was

of.

the disk

successful while the

of these op-

after

are required. After

must

that

continue
all

the sectors

The

overhead for

msec. This overhead

on

the

same

(ECC

are

system involves

Overhead

track.

sector)

used

it

does

on

to

recreate
no

require

for each

(ECC)
arbi-

write.

on

the

can

each

over-

each

1.

All

sectors

that

are to

use in constructing the

2.

Overhead

be'

not
this

Each

--

be

wri

phase

sector

One

revolution

tten.

is

eliminated.

is

wri

If

tten

Step 1 for constructing the

. 3.

Overhead

The

ECC

--

Same

as

sector· for

for

thi

s track or

sector.
Overhead

--

No

additional overhead.

4. Sectors written are checked
Overhead

tors,

--

One

revolution

including the

ECC

be

written during

ECC

sector.

is

needed

all

sectors

as

received'

ECC

sector.

normal

write operation .

for

CRC

is

required to

sector.

to read

on

the track are to

and

command

validity.

this

a1

so

is

verify

command

all

sectors

added

written

all updated sec-

are read for

be

to those

after

00701300-000

15

December

that

wri

tten,

from

the 1

1984

are

ast

4-1

.

The'.

total

transfers.

4.2 ARBITRATION

..

Inf.ormati9n

.

vi

d

e'd

at

relative

on

,.

at

.. th.is

e r ,rat

a

·overhead· of·

§uq,s.ystern.,opt,i,OD

e.

':':

t~e':

"

ECC

'option depends·

,i~',

..

nqw,..i'1·preparati,on·'·'and

..

.

upon:

,the ,s';ze

'w;ll~'be"pro~"

of

the'

00701300-000
15

December

4-2

1984

The
prior

following

to

disk

1.

Provide

interconnections

drive

operation.

an

interface

to

must

the

be

ho.st

made

•.

after

- .

subsystem unpacking and'

'2. Connect

drives.

3.

Supply

The

controller
system.
face

its
ion.
are
subsystem

The

the

interface
board must
test;
factory,

instal1eq.
fill

Orderi

each

illustrate

_ Connect;-qn

cable

drive(s)

All ·necessary

included in

host ;

cables

ng

of

the

general requirements.

ng

i nformat ion

of

the

the

"contro11er"

power

is

to

the

by a 50

via

the

nterf

cable

ace

to

be

custom

may

be

removed

both the

subsystem normally

Each

cables

the

tables

to

resident

to

the

controller

conductor

data

the

drive

controller

.'

and

power
be supplied
dri

ve

of

these

is

is

presented

and

and

the

subsystem.

within

host

and

control
interface

by

fit

for

from

and

cables

presented in

describe

the

is

(Figure

drive

a four conductor

cab 1 es are

particular

by

the

drive

contro

will

may

in-

its'

resident

first

made

21).

interfac~

signals

the

11

er

be

be

Append

this

their

drive

th.rough a

The

and

cable.

supp

1 i

system

user; however, since the

to

make

as

a subsystem takes

shipped with a

ordered

i x

B.
subsection.
application.

drive

of a

50

controller

cable in a

power

Power

cable.

ed

by

configurations~

the

from

Det

ai 1

to

any

one

or

two

conductor host

is

connected

daisy

for

the

second

is

supplied

the

user,

connection

drive

the

ed

Figures

wh i ch

p1

interface

manufacturer

i nformat i

21

additional

drive

chain

The

controller

and

ace at

through

inter-

to

allows

on

sub- .

fash­drive

drive
since
cable

about

'.

to

the

the

to

24

3

..

4.1

The

n a 1

s,

2.0
commended

mended

Host

host

commands,

of

this
if

~

_________________

The

host interface' cable

cable both contain

connector.

Danage
nected properly.
product
products
other types
the

Interface Cable

interface

manual

length

it

is

is

not campatible with

of

of

subsysten.

connection

and

dat a between

includes a

of

this

to

be

used

the

drives

cable

outside

WARNING

__________________

and

50

conductors

may

occur

The

drive

interface

manufacturer,

to

this

is a 50

the

description

is

6 m

pin cable

host

of the

(20

a shielded

the drive

and

if

they are not

interface

use the

cable

that

and

of

any

connection

connector will

and

the

ft).

enclosure.

that

interface.
A shielded cable

LSI

carries

contra

same
con-'

on

this

previous

of

damage

11

The

15

__

all

the

sig-

er.

00701300-000

December

Sect i

maximum

is

recom-

1984

re-

3-5

on

APPENDIX A

DIAGNOSTIC PORT ERROR CODES .

FOR

10/10.5 MEGABYTE, 8 INCH DISK STORAGE SUBSYTEM

WITH

EXTENDED SCSI

THE

00701300-000

15

December

1984

A-I

:,'INTRODUCTION'

Error i nformat i
provided

in

equivalent

~:F'irst:~'·'-~r~or".code's'>

tic

disp'lay board

the

Diagnostic

Second,

mand.

and
specific
given

Key

than
Sense

an

class.

for

by

Keys

error

In

this

error

portion

each

location

on

for

the

this

proposed

Appendix as subsystem Diagnostic

SCSI

ar'e

'.tlocked'::ser1'aTly'

(see

Port

subsectfon

Error

codes are

case,

code.

In

error.

the

The

of

the

addition,

The

in

the

error

device.

are included in

10/10.5

error

av

error

codes (Table

Code,

ai 1

ab

is

1 e

is

cla$s

the

SCSI

Sense

Key

subsystem.

the

proposed

megaby:te

8 inch di

A-I).

fo :a:"'shfft"fegl$ter':'oii:,the

l.3.4).

a one-byte hexadecimal

as

defined

groups

The

code

EXTENDED

groups

This' type

a response

by

~pecifying

together

indicates a particul

'SENSE

errors

Definitions

ANSI

standard,

Interface.
Note

ges a check
zeroes,
Error
power-ups
closed
command
again

th

at,

Code

the

for

accord i

condition

which

will

and

subsystem

since

the

ng

to

the

proposed

must

would

indicate

indicate

every time

reports

the

media might have been changed.

operation

be

reported.

no

error,

the

medi

a changed

the

load

a check

to,~ake

place~

SCS I st

lever

condition

but

The

the

status.

on

and

SCSI

Sense

the

to

sk

Port

'of

to

the

the

format

together

of

the

ard

s,

class

Key

This

drive

the

The

'storage subsystem' 1 s

Error

error

Codes

'code,

(2

digit)

REQUEST
both
errors

an

related

ar
reports
by

type,

error

and

''d~i

ag'nos':"

known

number.

SENSE

error

error

a Sense

rather

cl

asses

their

'as

com-

class

to
in a

and

Small Computer System

whenever

and

and

means

is

hos,t

command

med

i a

ch

an-

code values are

Diagnostic

that

opened

after

must

on

and

the

be

Port

all

then

next
sent

a

One
roes:
class
was

other

the
and

error

INVALID

code

changed.

report

REQUEST

bits

exists

signify

in which

error.

that

no

Do

error

the

not

error

assume,

class

that

has occurred, nor

and

code are both ze-

zeroes in

the

that

the

error

media

00701300-000
15

December

1984

A-2

.OIA~NOS.TIC.·

The

diagnostic
tive
ture

for the 10/10.5 megabyte, 8 inch disk storage drive subsystem. Struc-

of the

~ORT.:

ERROR

error

error

code

..

COq~S·:

port

is

error

as

follows.

codes presented in

this

Appendix

are

effec-

E

= Error
=

Type

T

Error

_-----------',i

_--------~xecution

_-----------C,orrmand

_---------"A

sce·1-l

1

terat

arieou's

..

Parameter

i.ons

lEE E E

Description of the

lowing

listing.

Code

~Hex)

/

(

00

Miscellaneous

80

Type

NORMAL

=

(High

=

CARTRIDGE

on a cartridge

errors

and

Error

COMPLETION

Priority)

WR

ITE

that

their

--

No

error

possible

was

Errors

PROTECT --Caused

is

in the write protect

~auses

are included

detected.

by

tryi

ng

any

mode.

wri

in

te

the

fol-

operat i

on

82

83

84

86

89

*8A

=

CARTRIDGE

detect

=

HARDWARE/DISK
interrupt

may

not

=

CANNOT
hardware

NOT

if

the

generated

be

READ

is

information

=

SPIN
come

=

PARITY

ity

=

OVERRUN

empty

UP

FAIL --An

up

to

ERROR --Will

error

on

ON

or

fill

LOADED --Reported
cartridge

SYNC

ERROR --This

happening in

Z-TRACKS --An

;s

inserted

by

the format sequencer

sync

with the disk format.

indication

unable to read data

on

the Z-tracks

is

indication

speed within the

be

allotted

reported

the host bus.

RECORD

1

--

Record 1 interface

within six revolutions.

when

and

error

from

invalid.

that

the drive

time.

if

the

the

controller

the bezel closedo

is

an

indication

is

not

that

either

the

the Z-tracks or

motor

controller

buffer

has

detects a par-

either

15

is

unable to

that

happeni

the

ng

controller

that

the

failed to

failed to

00701300-000

December

1984

A-3

or

*88

.::

OVERRUN
empty

or

ON

fill

'RECORD"

2

within

,~-,.

Record

six

revolutions.

2'·fnterface·

,.

buffer

eitner-fai

led to·

8e =

·'.··8·b:

..

··~

8F

=

.

90

=

91

=

92

=

93

=

94

=

MEDIA
cess

"'Etc

was

NO

h

ardw

tridge

hardware

Not
SERVO

Could be preceded
DRIVE

drive
FATAL

track.
RESEQUENCE

CHANGED --Cartridge

to

drive.

":WAS'~

OPTION --Tried

fN·vbK.~O;:.'~,;;:·

invoked

are opt

ECC

assigned.

LOOP

SELECTION

to

SEEK

to

ion.

turned on.

option,

ERROR --Failure

another.

ERROR --Retries

ERROR --Not

.

'last'"

recover

to

Can

but cannot

by

ERROR --Error

May

:,:11,0'

data.

invoke

al so occur

An

ECC

an

83

error.

be preceded

able

may

have been changed

.

,w"as"

':temp

leted"s'ucces~fu"ly'

'.

' ,

",

an

ECC

operation

when

cartridge

write

•

to

acquire

in switching se.rvo

by a 91

exhausted in

to

read a

try;

can

track

sector

without

ng

to

be

read without

on

drive

error.

trying

10

when

since 1 ast

but:ECC'

.

the

ECC/ARB

format a

selection.

__

J~oP

to

fr9111

seek

formatting.

target

ac-

car-

the

one

-.----.--

95

=

Execution

40

=

41

=

42

=

43

=

*Errors

reported
the

host's

ation.

10

to

Errors

SECTOR

sector

SEEK
after

OUT
sector

SECTOR

during

8A

and

to

transfer

No

data

READ
target

ERROR

track.

NOT

on

the

FAIL

four

OF

SYNC --The

marks during

MARK
an

10

88

may

the

host.

loss

~~

Failed

FOUND --Controller

disk.

--

Controller

tries.

ERROR --Contro

write

be

rate

will

~peration.

seen

Th

is

is

slow, can occur during

occur.

to

read 10

was

controller

the

operation.

11

occasionally

cond; t ion, though

was

unable

detected

er

was

in

on

source

unable

to

unab

the

most 1 ike

find

two

1 e

LED

any

track

to

the

consecutive missing

to

readout,

read or

before seeking

find

read a

the

requested

sector

yet not

1 y

to

occur

write

requested

track

mark

be

when

oper-

00701300-000

15

December

1984

A-4

·.44

.

45

46··

47

48

49

4A

48

....

=.

~ES

..

ERROR

:~rit~

=

DATA

Record

.~,·.-DATA···CRC..

Recor..d·

=

DATA

mark

=

DATA

mark

=

PREWRITE
error

operati

=

PREWRITE
error

.-~Jndic.ates

thiss~t~6riafeiy~

CRC

ON

RECORD

1

--

tha~.

Controller detected a data

1 of the sector being read.

ON:·

..

2-,

of·

SYNC

on

Record

SYNC.

on

Record

CRC

on

Record

RECORD.

the

ON

RECORD

ON

RECORD 2 --

ON

·2~·.-.~

sec~or,

,Cont.ro.ll.er.~det~.c.t.ed

being

1

--

1 of the requested sector.

2 of the requested sector.

RECORD 1 --

1 duri

ng

prewri

on.

CRC

ON

RECORD 2 --

on

Record

2 duri

ng

write operation.

=

POST-WRITE
on

Record

CRC

ON

RECORD

1 of a sector

1

that

ation.

the

.head

read·

..

may

be

.~Qo.f.ar

...

·a:

..

~ata

...

off tr.ack ·to

CRC

error

CRC.:

..

e~ro~···.P~.

Controller not able to read the

Controller not able to read the

The

controller detected a data

te

CRC

The

controller

the prewri

--

The

controller detected a

was

written during

~

te

check

CRC

duri

n9

an,

ECC

detected a data

check

duri

ng

CRC

this

write oper-

SYNC

SYNC

wri

an

error

on

CRC

te

CRC
ECC

4C

=

40

=

4E

=

Command

Parameter Errors

20

=

21

=

22

=

25

=

POST-WRITE
on

Record'2 of a sector

ati

on.

CRC

ON

NON-RECOVERABLE

more

than

one

record 1 data

read.

NON-RECOVERABLE

more

than

one

record 2 data

read.

INVALID
host

INVALID

COMMAND --The

is

not part of the

ADDRESS --The

the address range.

INTERLEAVE

mand

or

CARTRIDGE

-

im.um

10gi

BAD --The

FORMAT

.Z-TRACK

FULL --A read or a write

ca

1 address.

RECORD 2 --

ERROR

ERROR

ON

ON

address passed to the

-specified interleave for a
subcommand

The

that

was

RECORD

CRe

1

error

RECORD 2 --

CRC

error

command

passed to the controller

controller

controller detected a

written during

--

The

controller

on

this

The

controller

on

this

command

set.

this

has

track during

has

track during

controller

FORMAT

was

il1eg~1.

was

attempted

beyond

CRC

error

write oper-

detected

an

ECC

detected

an

ECC

by

the

is

out of

UNIT

the

com-

max-

26

=

INVALID

REQUEST --A parameter byte

had

invalid information.

15

00701300-000

December

1984

A-5

. Alteration· Errors: .

10

=

NO

11

.

,12

;
13

SPARE

=

NO

SPARE

....

,~

..

J~~RITE<

quested..'

=

BAD

TRACK

SECTOR

TRACK --No

..

ID

..

ERRqR

FORMAT' --Track

could not determine

14

=

RESEQUENCE

READ

write read pass

15

=

TOO

16

MANY

th

an

=

RESEQUENCE

FLAGGED

spare-s

quencing.

Startup Diagnostic Errors

-~.

:,~~.·

ERROR --An

prior

IDs

av

a; 1 ab

WRITE

No

remai

ni

ng

spare sectors are

remaining spare tracks are

...

CQ.t)tr.o

which

1 e.

ERROR --An

11er~

to

~esequencing.

--

Resequence

was.

,.

had

excessive

sector to

10

read error

10

error

un.ab)~

flag.

routine

on

the.

track.

on

the

cartridge

..

::tQ;.~·~ri.t~:,.

.an

:,10

...

as

.

re-

.

,

.

bad

IDs

..

Controller

was

found

was

detected

more

detected

on

IDs

after

a pre-

flagged·

rese-

FO = SEEK

Fl

=

CRC

error
F3 = WRITE
F4 = READ
F5 = ALL

ERROR --Missed

DETECTION

ERROR --Di

sectors.

BUFFER

BUFFER

ONES

FAIL· --Wrote

FAIL --Read

READ

ERROR --Had

sectors factory-written

F6 = STRESS

tors
F7 = INCREMENTING

READ

ERROR --Had

factory-written with a

READ

ERROR --Had

. sectors factory-written with

F8 = ALL

F9 = STRESS

ONES

not

match

match

COMPARE

the

al i ones

COMPARE

the

stress

ERROR --Had

ERROR--

data written at time of

one

of

20

random

d not detect

data

data

when

when

a data

wit~

an

all

a data error

stress

a data

an

incrementing data

a data

seeks.

all

the buffers

the buffers

error

ones

data

on

data pattern.

error

error

data written at time of

Had

a data

error

when
test.

of the prewrftten

on

were

were

all

empty.

full.

attempts to read

CRC

pattern.

all attempts to read sec-

on

all attempts to read

pattern.

when

the data read did

test.

the data read did not

FA = INCREMENTING

with
FB = ECC
FC = SYNC

is

an

incrementing data pattern.

CIRCUITRY

CIRCUITRY

not functioning properly.

COMPARE

ERROR --ECC

ERROR --Circuitry

00701300-000

15

December

1984

A-6

ERROR --Same

circuitry

to detect

as

stress

compare

error

not functioning properly.

10

'and

data

sync

only

marks

TABLE

·ERROR

A~1

CODES'

'.

No.

. '00:::

80
82

83

84

86
89
8A
8B
8C
80
SF

40
41
42
43
44

45
46
47

48
49
4A
4B
4C
40
4E

4F**

20

21

22
25

26

Diagnostic Port
Error

Codes*·*

. Description

'NORMAL

"

CARTRIDGE WRITE PROTECTED
CARTRIDGE
HARDWARE/DISK SYNC ERROR
CANNOT READ· Z·

SPINUP

PARITY
OVERRUN
OVERRUN

MEDIA

'ECC WAS

NO OPTION
SECTOR NOT FOUND

SEEK
OUT OF SYNC
SECTOR

PES
DATA
DATA
DATA

RECORD 1
DATA

RECORD 2
PREWRITE

(ECC)
PREWRITE

(ECC)
POST·WRITE

(ECC)
POST·WRITE CRC

(ECC)
NONRECOVERABLE

RECORD 1
NONRECOVERABLE ERROR
RECORD 2 (ECC)
NONRECOVERABLE ERROR
ECC

INVALID
INVALID
INTERLEAVE
CARTRIDGE
INVALID

COMPLETION:

FAIL

ERROR

ON
ON

CHANGED

INVOKED

FAIL

MARK

ERROR

CRC

ON

CRC

ON

SYNC
SYNC

CRC
CRC

(ECC)

SECTOR

COMMAND

ADDRESS

REQUEST

NOT

LOADED

TRACK

RECORD 1
RECORD·2

ERROR

RECORD 1
RECORD 2

ON
ON

ON RECORD 1
ON RECORD 2

CRC

ON RECORD 1
ON

RECORD 2

ERROR

BAD

FULL

ON
ON
ON

Sense*

Class*

Key

. :

"'0: ' .

"0

1.

2

4

9

4

4

4

4

6

0
1
9 1

3
4

3 a 1

3

3

0

3

3

3 1

3 1

9

1

9 1

3

0 3

3

0 3

3 1
3
9 1

5 2

5

2 1

5 1
5

0 A

5

0

No.

0'"

1

0 9

0

0
0 4
2 3·

1
1

1

1 4
1 5

1

7

.1

6

B
B
0
8

C

2

3

1

1 1

1

1

3

3
C
C

1

1

0
0
A

.0

SCSI

Equivalent

Error

Codes

Description

NO'SENSE
WRITE PROTECTED

MEDIA
NO
NO
DRIVE
VENDOR UNIQUE
DATA
DATA
NO
CORRECTABLE

NO
RECORD NOT FOUND

SEEK

NO
10 ADDRESS

WRITE

UNCORRECTABLE
UNCORRECTABLE

DATA
DATA
VENDOR UNIQUE
VENDOR UNIQUE

WRITE
WRITE

UNCORRECTABLE
UNCORRECTABLE
VENDOR
INVALID

ILLEG

INTERLEAVE

INSUFFICIENT CAPACITY

NO

NOT
INDEX
TRACK

SENSE

ECC/ARB OPTION

INDEX

SENSE

LOADED

SIGNAL

0

NOT

READY

TRANSFER
TRANSFER

ERROR

SIGNAL

FAULT

ADDRESS
ADDRESS

FAULT
FAULT

UNIQUE
COMMAND

..

"L

BLOCK ADDRESS

NOT
NOT

DATA

MARK

MARK

MARK

ERROR

DATA
DATA

DATA
DATA

COMPLETE
COMPLETE

CHECK

NOT FOUND

NOT FOUND
NOT

ERROR

ERROR

FOUND

ERROR
ERROR

10

NO

11

12·16

01
02
03

91·95

FO·FC

*

See

"Could

***See Diagnostic Port Error

SPARE SECTOR

NO

SPARE

FLAG
ROM TEST FAI LURE

RAM TEST FAI LURE
INTERFACE BUFFER TEST
FAILURE

SYNCHRONIZATION ERROR
DIAGNOSTICS FAI LURE

ANSC X3T9.2 Proposed Standard, Small Computer System Interface.

be

anyone

TRACK

SECTOR FAI LURE

of

the following errors: 40, 44, 47, 48;

Codes

listing in this Appendix.

3·
3

9 1

·

·

·

9

A

0
0 A

·

·

·

O-C

3

4B

through 4E.

A

INSUFFICIENT CAPACITY
INSUFFICIENT CAPACITY

E

VENDOR UNIQUE

·

} SEE SUBSECTION 3.3.

·

·

C

TECHNICAL

MANUAL,

VENDOR UNIQUE
DIAGNOSTIC

Code

4F

is

DESCRIPTION

00701300

ERROR

not

actually

15

seen

on the

LEOs..

00701300-000

December

1984

A-7

APPENDIX B

INTERCONNECT CABLE·

ORDERING INFORMATION

00701300-000

15

December

1984

8-1

· I

nterf

face the

ace

and

power

Alpha-l0H/10.5H""
cables are available
connection,
diagnostic tool
tion

directly

especially

(error

from

cab

1 es ,prav i

de:

a

11

the . interconnect i

disk drive to

from

IOr~EGA

Corporation

durin9 subsystem evaluation.

readout assembly),

the

LSI

controller.

which

its

on

needed

host

as

and

power

a convenient aid for

Also

displays

available

error

,to,

supply.

code

informa-

. i

nter-

The

inter-

is

a

Table 8-1

users wishinq

AVAILABLE

The

follow;nq cables

HOST

The

to
at
1,

INTERFACE

host
the host adaptor. Consisting of a
each

2,·

and

Length

1

2

4

of

this

to

fabricate

FROM

THE

CABLE

interface

end

with a

4 meters. Part

(m)

Part

Number

00116900

00112700

00112800

quide includes cable

their

MANUFACTURER

can

be

ordered

cable (Fiqure

50

pin

IDC

connector,

numbers

and

own

cable harnesses.

directly

B-1)

connects the

50

from

conductor ribbon cable terminated

it

is

of the cables are:

Pt~1

(USERS
OPTION)

Lj,/

/

'connector' specificat-ioris "for

IOMEGA.

digital

controller

board

available in three lengths:

~

50

CONOUCTOR

PIN

1

Jl&

POWER

Power

CABLE

(IOMEGA

'i s supp 1 i'ed

to the dri

Length of the harness (Figure

The

other

Quired.

end

The

is

power

left

cable also will

·r

~~GROUND

~

00701300-000

15

December

8-2

1984

PIN

00216000)

ve

B-2)

through

is

36

Figure

an

B-1.

16

inches with a connector at

unterminated, allowing cutting

fit

Figure

most

914 MM (36 IN.) i

/

/,'

B-2.

Power

ST506/706

Cable

Host

AWG,

four conductor harness.

Harness

Interface

and

terminating

controllers.

Cable

one

as

end.

re-

,

+12

VDC

ERROR

The

tion
and

.r~ctly.

READOUT"

error

on

circuit

readout assembly

two

hex

board for displaying diagnostic information.

t9~-·.~~e.,

•

..

di~gn.9-st5.c,

TO

ERROR

ON

LSI

DIGITAL

BOARD

ASSEMBLY'

(IOMEGA

(PIN

PIN

··oo7i47(0)··

00714700)

which

provides

displays (Figure B-3), includes both the

..

Po.~t·

..

o~

~h~.

pr1.

v.~.>cC?nt.ro.ll.e.r.·.pq~rd

HEX

DISPLAYS·---+H~

iN

1

PIN

1

PORT

b

~~~~~~~.~-~~-

COLORED

EDGE

4

CONNECTOR

>~"%~

----~~~

"

error
IOMEGA

code

unique cable

It

connects

..•.

informa-

di-

Figure

USER

Table 1

Host

Drive Interface Cable

Power Cable Power Supply

Error Port Cable LSI Digital

• Pins 43 and 34 are clipped and plugged

FABRICATED

shows

Cable Location

Interface Cable Host

CABLE

the

to

Controller
Controller

Drive

Interface·

to

Controller

Board

details

to

B-3.

HARNESSES

for

custom

TABLE

CABLE

Connector

Number

for

CONNECTOR

Type

50

J1

50

J2
J4

J3

keying

Pin

Pin

Pin

4

Pin

4

Error

Readout

Assembly

manufacturing the cable harnesses.

B·1

IDENTIFICATION

Component

Connector

Part

Molex

4700

15·254505

4700

15-25-2505

1-480424-0

--

Number

3M

3425-6000

3425-6000

--

--

Type

50 Cond
28AWG

50

Cond

28AWG
18

AWG

Twisted Pair
4 Cond

28AWG

. Cable

Flat

Flat

16/30

Flat

Number

Part

Molex

82-28-5750

82-28-5750

3075

(Alpha Wire)

--

3M

3365/5

3365/5

--

--

00701300-000

15

December

1984

B-3