IBM 3350-A2, 3350-A2F, 3350-B2F, 3350-C2, 3350-C2F Reference Manual

GA26·1638-2 / File No. 5370:07 ·

Systems

Reference Manual for

IBM 3350

Direct Access Storage

Preface

This publication cessing personnel with the characteristics of IBM

is

intended to familiarize

data

pro-

3350 Direct Access Storage. The reader should have prior knowledge of direct-access storage devices and concepts.

The publication lists the functional characteristics and describes the record format, capacity, and timing characteristics. A list 3350

is

included in the Channel Commands section.

of

all commands executed by the

Suggested operator instructions are included in the Operator Controls and Indicators section.

The following publications are recommended for detailed information

con<:;erning

the subjects covered

in this manual:

IBM

No.

GA22-

System/370

7000

•

• Reference Manual

Model

2,

Order No. GA26-1617

Principles

for

IBM

of

Operation, Order

3830

Storage Control

• Reference Manual for Control, Order No.

IBM

Integrated Storage

GA26-1620

• The functional characteristics manual applicable to

Order

the parent system. characteristics manuals can be found in the

System/

and System I 3

360

Bibliography, Order No.

70

Bibliography, Order No.

numbers for functional

IBM

GC20-0360

GC20-0001.

• The Data Processing Glossary,

Order

No.

GC201699, defines terms related to direct-access storage devices.

• Additional information for use when planning a 3350

installation can

be

found in the

3350/

3344

Installation and Conversion Guide, Order No.

GC20-1780.

If

IBM 3350s are

part

of a system which includes the IBM 3850 Mass Storage System, certain attachment restrictions may apply. These restrictions are detailed

IBM

3850

MSS

in the

Principles

of

Operation,

Order No. GA32-0029.

Third Edition (April 1977)

This

publication replaces

IBM 3350 Direct Access Storage,

contents edition. change.

Changes periodically made. Before using this publication in of IBM

Copies of this Offices.

A form

This

Publishing, ©Copyright

ii

of

Changes

or

equipment,

form

for

has

been

manual

IBM

3350 Reference

Technical

additions

and

reader's

removed,

was

prepared

Department

International

and

makes

Order

Newsletter

or

additions

to the specifications

contact

other

comments

are

the local IBM

IBM publications

is

provided

send

your

by

the

G26, 5600 Cottle Road,

Business Machines

Manual

the

second

edition

No. GA26-1638-1, obsolete.

GN26-0326

indicated by a vertical

comments

IBM

contained

Branch

can

at

the

General

has

be

back of this publication. If

to

the address below.

Products Division, Technical

San

Corporation

of

Reference Manual

been

incorporated

bar

to

in this publication

connection

Office

for

revisions.

obtained

through

Jose,

California

1975, 1976, 1977.

The

into this

the left

with

the

IBM Branch

95193.

for

of

the

are

operation

the

Contents

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Highlights

General

IBM

Attachment

Compatibility With Existing Storage

IBM IBM IBM

Models and Special

3350

Special

String Switch Primary

3350

Data Data Record

Count Key Data

Track

Home Record Data

Write Padding Track

3330 3350

Input/Output Drive

Drive Addresses . . . . . . . . . . . . . . . . . . . . . . . . . 15

Valid

Seek Addresses. . . . . . . . . . . . . . . . . . . . . . . . . .

Access

Seek Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Head

Latency................................

Data

Write

Seek Verification . . . . . . . . . . . . . . . . . . . . . . . . 18

File Protection . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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

Description

3350

Attachment

3330

Model 1 Compatibility

3330

Model

3350

Native

Models

Head/Disk

Formats Groups

Format

Capacity

Modes

Integrity

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

Features

Controller

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

Format

Area

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

Area

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

Address

Zero

Records

Compatibility Native

Operations. . . . . . . . . . . . . . . . . . . . . 15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3350

and

Data

Selection Time . . . . . . . . . . . . . . . . . . . . . 1 7

Transfer

Protect

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

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

to

3850

System

11

Compatibility

Mode

Features

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

Adapter

Assembly

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

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

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

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

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

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Modes.................

Mode

. . . . . . . . . . . . . . . . . . . . . . . 10

Addresses.....................

Transfer

Rate.

. . . . . . . . . . . . . . . . . . . . . . 1 7

and

Security. . . . . . . . . . . . . . . . . . . 18

. . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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

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

Mode

........

Mode

.......

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

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

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

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

Time . . . . . . . . . . . . . . . 17

10

15

1 7 1 7

17

6 6 6 6

7

Error Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9

l

1

3 3 3 3 3 3

4 4 4 4 4 5

6 6

6

Error

Correction

Error

Correction

Error

Recovery

CCW

Restart

Error

Correction

Recovery

Channel Commands Control Search Read Sense Format Update

Sense

Sense Byte Summary. . . . . . . . . . . . . . . . . . . . . . . .

Sense Bytes

Commands.

Commands

Commands.

Commands

Write Write

Data

Function

Table . . . . . . . . . . . . . . . . . . . . . . l 9

Action . . . . . . . . . . . . . . . . . . . . . . 19

Construction

Table. . . . . . . . . . . . . . . . . . . . 20

Action Table

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

. . . . . . . . . . . . . . . . . . . . . . . . . 25

. . . . . . . . . . . . . . . . . . . . . . . . . . 25

Commands. Commands

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

0-

7 Summary. . . . . . . . . . . . . . . . . . . . 32

. . . . . . . . . . . . . . . . . . . 19

. . . . . . . . . . . . . . . . 19

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

. . . . . . . . . . . . . . . . . . . . . . . . 25

. . . . . . . . . . . . . . . . . . . 25

. . . . . . . . . . . . . . . . . . . . 25

21 25

31 31

6

6 6

Operator Operator

Ready Attention Read, Start/Stop

Power

Power Enable Power A and B

Controller

Primary Primary/

Index

Controls And Indicators . . . . . . . . . . . . . . 43

Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Lamp

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Pushbutton.

R/W

Switch . . . . . . . . . . . . . . . . . . . . . . . 43

Switch. . . . . . . . . . . . . . . . . . . . . . . . 43

Control

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

Panel

On

Switch . . . . . . . . . . . . . . . . . . . . . . . .

Power

On

Off

Indicator

Enable/Disable

Assignment Panel

I

Alternate Alternate

. . . . . . . . . . . . . . . . . . . . 43

(A2/

A2F)

. . . . . . . . . . . . . . 44

Switch . . . . . . . . . . . . . . . . . . 44

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

Switches . . . . . . . . . . .

(C2/C2F)

Switch . . . . . . . . . . . . . . . . .

Indicators

(C2/C2F)

. . . . . . . . 44

......

44

44 44

45

Contents

iii

Illustrations

Figure

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure

Figure 11.

Figure

Figure 13.

Figure 14.

Figure 15.

Figure 16.

Figure 17.

Figure 18.

Figure 19.

Figure 20.

Figure 21.

Figure

Figure 23.

Figure 24.

Figure 25.

Figure

Figure 27.

Figure 28.

Figure 29.

l.

10.

12.

22.

26.

IBM

3350

Disk Storage

Basic

3350

Characteristics

3350

Track

Format Record Record

Drive Addressing. . . . . . . . . . . . . . . . .

Addresses for

Mode

Addresses for

3330-11 Error Recovery Control Search Read Sense Format Update Sense Bytes 0 Sense Byte 0 Sense Byte Sense Bytes 2 Sense Bytes 6 Format Format l Summary Format 4 Summary Format 5 Summary Format 6 Summary 3350 3350 3350

Capacities,

Capacities, With Keys . . . . . . 13

3330-1

. . . . . . . . . . . . . . . . . . . . . . . . . 16

3350

Compatibility

Correction

Action

Commands.

Commands

Write Write

Messages. . . . . . . . . . . . . . . . .

Operator Power Controller

Table Table

Commands Commands

through 7 Summary

Description

l Description . . . . . . . . . .

through 5 Descriptions. and

Panel.

Control

Assignment

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

...........

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

Without

Native

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

. . . . . . . . . . . . . . . 27

. . . . . . . . . . . . . . . . 28

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

7 Descriptions . . . .

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

.......

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

Panel

Keys . . . .

Compatibility

or

Modes

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

. . . . . . . . . . . . . 43

......

. . . . . . . . . .

. . .

. . . . . . . . . . 33

, . . . . . . . 41

. . . . . . . . .

Panel.

. .

2 5 8

11

15

16 20 21 26

29 30 30 32

34 35 36

37

38 40

42

44 44

iv

IBM

3350 Reference

Manual

The

IBM

3350

Direct Access

access, large-capacity, high

data

reliable online to

IBM

System/370

155-Il, The

tages with data-transfer

The each

compatibility, To ty 3 3 50-1 number

I IBM

Maximum string in

The storage

•

• Message switching

• Systems residence

•

158,

3350

offers

increased

3350

selective

drive

to

the

system, a 3350

mode

has

the

1.

The

of

cylinders functionallv

3330

Model 1 or

capacity

the

3350

provides

for a wide range

Data

base/ Inventory Graphic Time-sharing

Other processing

processing

applications requiring direct

storage.

Models 135, 138, 145. 148,

158-3,

165-H, 168,

significant

recording

rate.

format

operate

3330-1

data

and

in

l compatibility,

same

characteristics

track

formats,

can

native mode.

high-performance,

communications

manufacturing

HIGHLIGHTS

•

Cost

per

byte: lower

storage

•

Storage or

Data

•

• Seek time:

•

Latency:

•

Command Multiple

•

Rotational

317

facility.

capacity:

(native

rate:

mode)

1198

an

average

8.4 milliseconds set: similar to the

Count,

position sensing:

200

thousand

Key,

Storage

data-rate,

The

3350

and

cost/performance

density

standard

one

of

drive

operating

the IBM '3330

be

obtained

of

applications such as:

than

(3330

million

of

25 milliseconds.

and

feature

three

modes:

as a

tracks

per

match

by

control

any

previous IBM disk

compatibility

bytes

per

(average).

3330

Data

command.

standard

provides low-cost, .

can

168-3.

and a faster

or

in a compatibili-

cylinder,

those

Model

running

large-capacity

or

per

second.

with a Read

fast-

be

attached

advan-

allows

3330-1

3350

native.

3350-1

sequential

feature.

of

11.

mode)

drive.

or and

the

• Fixed

"'

•

GENERAL

A

3350 from types drives, arc available in models units use the increase

The with 16 able storage ing, index signal, models on

The

controller other

B2

required, an can be A2F, zero an

Alternate ed, a maximum installed

lers.

Each

storage

3350

patibility. This selective

be specified for

order

A functional

in

Figure

head

model

with

Security from verification.

Alternate data

one

IBM

3350

by

track

the

first unit in

or

seek

of

native,

and

operator

availability.

Direct Access

to

four

of

3350

and

one

extensions

3340

storage

uses a

recording the user. and

one

following,

and

featuring

servo surface.

(Model

units

(up

B2F).

alternate

substituted

B2F,

and

time

Controller

between

the eight drives

subsystem

3330-1

and

can

description

1.

models: up zero

seek

privacy: write

panel, file

conlroller

DESCRIPTION

Storage

dual-drive disk

are available;

with

only

of

disk

storage

capacity,

sealed

surfaces.

Fifteen

contains

data indicating the fixed

each

3350

A2

or

to

three)

Where

increased

controller

for

C2F

provide

storage

of

two

the

A2/A2F

can

compatibility,

each

individual drive

be

changed

the

per

82

operate

to

2.2 million

time.

protection,

feature:

subsystem

two

the

drives. All having the

Head/Disk

head

fixed technology with

data

rate,

The

surfaces

servo

clocking,

storage,

string must

A2F)

and

consist

data

last

dual-drive

up

drive

model

(C2

or

B2F

and

(four

dual-drive units) in a

in

format

if required.

of

the

3350

Introduction

bytes

protection

provides

storage with a

improvements

Assembly

HDA

are used

information

generating

rotational

dual-drives.

of

dual-drives

availability is

(Model

to

1.1

under

or

models

C2/C2F

one

or

standard

control

and

increased

consists

units.

controller

3350

head

storage.

developed

and

reliability.

is

not

position.

data

is

contain

C2

unit. Models

million

fixed

C2F)

can

of

three

3330-11

feature

at

the

models is

for

time

per

seek

Three

and

units

for

that

(HDA)

remov-

data

for

seek-

the

also

stored

a

The

(Model

or

C2F)

bytes heads. is select-

be

control-

modes:

com-

must

of

shown

of

The

In

of

If

Introduction

1

3350-A2/A2F

IBM

3350-A2/A2F

drives)

CONTROLLER

C2/C2F,

• Interprets and executes

control

• Regulates the storage interfaces

• Checks data correction

can

(only

be

functions

one

online}

integrity

or

C2/C2F

controller

commands

control

by

error

(controller

in a string,

and disk drive

detection

from

and

A2/

the storage

3350-82/B2F

and two

A2F

or

error

IBM

3350-B2/B2F

e Responds

e Positions access mechanism

• Selects the read locates a specified

•

• Reads

• Provides

or

writes

safety

to

(two drives)

commands

I

write

head

sector

data

and service

from

the

controller

at

a physical cylinder

on

a selected track

information

or

3350-C2/C2F

(shown)

for

evaluation

• Controls the format

• Furnishes status and sense

control

• Performs

string

writing

fields

diagnostic

and

evaluation

• Serializes and deserializes data

• Provides and controls ac string

(A2/

A2F

only)

DRIVES

• Responds

(A2/A2F,

to

or

C2/C2F

commands

from

• Positions access mechanism

• Selects the read I

•

locates a specified

• Reads

• Provides

Figure

or

writes

safety

I.

IBM 3350 Disk

write

head

sector

data

and service

Storage

interpretation

information

of

power

for

has

two

independent

the

controller

at

a physical

of

to

the

3350

the entire storage

cylinder

on a selected track

information

for

the track

the storage

storage

drives)

evaluation

IBM 3350-A2F,

• Native storage

Compatibility

• head storage

Mode

per

B2F,

- provides

drive

with

Mode

per

drive

and C2F Models

1,

144 kilobytes

zero seek time.

- provides 742 kilobytes with

zero seek time.

of

fixed head

of

fixed

2 IBM 3350 Reference Manual

IBM

3350

ATTACHMENT

The

3350

can

be

attached

System/370 Model Attachment Device

] 35 138

145

148 155-II 158*'

158-3

165-11 168,

168-3 *Also 158 Attachment

involve additional

Attachment to

The

3350 Storage native

I

3850

staging. A provides additional 3350

storage Storage staging

Expanded feature can

be C2/C2F Figure

systems:

3830-2

Integrated

3830-2

Integrated

3830-2

Integrated

submode! 2 (Japan

of

IBM

requirements.

IBM

DASD

System Staging

mode;

Control

adapters

on

made

in their normal

1.)

however,

to

be

control either

up

of

can

new

microprogram

attached and on

store

the

Models

Storage

3350s

3850

be

attached

Adapters

the

feature,

to

the

either

is a

3830-3

configuration

to

the

following

Control

only)

to

the

systems

Mass

to

as real spindles in

3 3

50s

cannot

control

storage

to

IBM

158/

168 ISCs

one

or

both

prerequisite

or

ISC.

A2/

A2F,

(ISC)

or

3830-2

(ISC)

or

3830-2

(ISC)

or

3830-2

shown

may

Storage System

the

3850

Mass

be

used

for

store

additional,

to

permit

3830

Model

paths.

for

Each

B2/B2F,

sequence.

that

the

3350

3

have

new

string

and

(See

COMPATIBILITY STORAGE

Each

3350

drive

is

formatted

of

three

operating 3330-11 modes unit.

IBM

In contains logical volume

IBM

In one

3330-1

in

IBM

In logical device with bytes

compatibility,

can

vary

3330

the

3330-1

two

3330-1

in

capacity

3330

the

3330-11

logical

3330-11

l volume is

capacity

and

3350 Native

the

3350

of

storage.

modes:

between

Model

compatibility

logical

volume is

and

Model

compatibility

equal

format.

native

mode,

the

WITH

or

EXISTING

at 3330-1 3350

drives

manufacture

compatibility,

native.

on

the

1 Compatibility

mode,

a single

3330-1

11

volume

volumes

equal

to

an

format.

Compatibility

mode, a 3350

of

data.

to

an

actual

Mode

the

drive is used as a single

full

capacity

Operational

same

Mode

of

data.

actual

Mode

Eac,;h

3330-11

of

317

into

one

string

3350

drive

Each

3330-1

drive holds

logical

volume

,498 kilo-

or

Introduction

3

Models and Special Features

The

3350

dual-drive storage units are available in six

and

can

models described when required.

incorporate

3350MODELS

Six

3350

models are available: the

and

storage with fixed storage), heads), the controller), heads

The

fixed heads provide storage takes the place the

moving heads.

When 3330-1 compatibility mode, the fixed associated with the first logical volumes

controller),

heads

the

C2

and

alternate

up

to

per

drive.

a Model

and

controller),

B2F

(dual-drive storage with fixed

(dual-drive storage

the

C2F controller).

on

Models

1.144

million

The

of

an equal

A2F,

B2F,

on

the drive.

the special features

A2

the

A2F

(dual-drive storage the

B2 (dual-drive

and

(dual-drive storage with fixed

A2F,

B2F,

bytes

of

zero

fixed

head

storage capacity

amount

or

of

the two logical 3330-1

C2F

of

drive

head

(dual-drive

alternate

and

C2F

seek time

storage

is

used in

storage

under

the

is

The

fixed

head

storage capacity

and

C2F

is:

3350

Native Mode Compatibility Mode

Logical Cylinders 1-2

Tracks Tracks/Logical

Cylinder

Capacity

(bytes) Capacity

(bytes)

SPECIAL

Three Direct

and

String

/Drive

/Unit

FEATURES

special features are available for the IBM

Access Storage: string switch,

primary controller adapter.

Switch

0-29 30

1,144,140

2,288,288

of

Models

3330-1

0-18

742,710

1,485,420

remote

A2F,

or

1-3

19

B2F,

3330-11

3350

switch,

The

C2

and

C2F

alternate the user to manually select C2/C2F drives controller requires service, manual switching other A2/ subsystem availability

When controller

reservations

procedures, required by

must be

Installation a

3350 adapter ler.

The

as

the

online controller.

then

function as a

controller

A2F

subsystem

performed

subsystem requires

feature be installed

basic

when

(by

a switch

control

to

the

other,

(if

any) are lost.

of

an

alternate

3350

characteristics are

by the user.

controller models permit either

the

A2/

The

other

B2/B2F

preceded on

the

to

be re-established.

has

outstanding

the

controller ( that

unit.

If

by a

power

C2/C2F)

been

Recovery/restart

controller switchover,

a primary controller

on

the

unit allows

switched from

status

C2

A2/

A2F

shown

A2F

the online

and

or

in Figure 2.

or

the

controller

to

the

off

on

the

one

drive

C2F)

control-

on

The

string switch feature, available models, allows a shared

dedicated

Enable/ be (A2/

switch feature

mended C2/C2F storage control.

REMOTE SWITCH ATTACHMENT

The

switch

System/370

string switch feature is a prerequisite for this feature.

Primary

The

the adapter

controller

through use a

by

Disable switch.

installed

A2F

that

to

remote

to

be controlled from the

Controller Adapter

primary controller

A2/

A2F

permits

3350

subsystem.

3350

subsystem

two

storage controls.

to

a single storage

The

on

either

or

both

and

C2/C2F}

is

installed

a string switch also

allow communication with more

(Enable/Disable)

Model

when a C2/C2F

the

of

the

A2/

of

a manual switch

in a string.

on

158

or

168 Multiprocessor.

adapter

selection/

A2F

unit as

for

all controller

to

be

dynamically

The

3350

can

be

control

controller units

the

through use of

string switch feature

If

the string

A2/

A2F,

it is recom-

be

installed

switch allows the string

control

feature

model

is

deselection

the

online controller

on

the

on

than

panel

is

required

used.

of

the

C2/C2F

the

of

The

unit in

can

one

a

on

the

4 IBM

3350

Reference

Manual

The

3350

storage subsystem uses a sealed,

assembly

(HDA)

as the storage medium. ing heads and the carriage are HDA.

an

integral

head/ The part

disk recordof

the

All

IBM

3350

drives are shipped formatted in the operating

3350

Head/Disk

mode specified by the customer. operate

in a different mode it

can

an IBM supplied program.

If

an

HDA

be

reformatted

Assembly

is

to

with

Characteristic

3350

in

3330-1

Compatibility Mode

(2 per drive)

404

Cylinders per drive

Tracks per cylinder 19 Tracks per drive

Track capacity

(bytes) Cylinder capacity

(bytes) Drive capacity

(approx bytes) (per logical volume)

Figure

2.

Basic 3350

Characteristics

(plus 7

alternates)

7,676

133

alternates)

13,030

247,570

100

million

(plus

3350

in

3330-11

3350in

Compatibility Mode Native Mode

808

(plus 7

alternates)

19

15,352

133 alternates) 1 50 alternates)

13,030

247,570

200

million

(plus

555 (plus 5

alternates)

30

16,650

317.5

(plus

19,069

572,070

million

IBM

3350

Head/Disk

Assembly 5

Data Formats

All

3350

drives are initialized shipped with a home address and an eight-byte descriptor data IBM utility program tracks

record

areas become defective during normal use, an

and

assign alternates.

(RO)

is

written

available

at

manufacture

on

all tracks.

to

flag defective

If

and

track the

The

data

area

length

Once

formatted,

the

data

area

count

and key areas in the record.

TRACK

FORMAT

can

the

be

is

defined

contents,

changed

by

the

count

area.

but

not

the length,

without affecting the

of

DATA

The consisting bytes gaps are tion unit.

RECORD

A record consists area, the key area, sary gaps to entire record

GROUPS

basic information unit

of

eight bits

separated

combined

by

FORMAT

separate

is

called formatting.

Count Area

The

count

area

contains the physical address record and defines the record. is

formatted

reformatted.

The

and

count

is

Key Area

stored

by the drive

(binary a gap to form a record, the basic informa-

of

three specific areas: the

and

the

them).

the

size area

not

changed

digits). A group

is

called an area. Areas and

data

area (plus

The

process

of

key

and

data

is

written

until

when

the

is a byte

of

count

the

neces-

of

writing

of a data

areas

the

record

record is

of

an

Each

track has the same format: a

track

descriptor record,

The

records,

by

gaps. See Figure 3.

Home

Each

track

the physical location

track

the recorded

Special commands are required to read home

Track

The

track descriptor record is

the

home

the

RO

track

if

the

address

Special commands are required to read and write in the

and

Address

contains one home address

condition. area

following the index point.

address area.

Descriptor Record

add.ress area.

count

area

the

track

of

the

RO

area.

and

the

areas

in

of

the

track

The

home address

In

IBM

provides

is defective.

defective

the

home

address, a

one

or

more

data

the

records, are

(HA)

(track

address) and

is

the

and

write in the

the

first

record

programming systems,

address

If

the

track

of

an

track

is

an

is provided.

records.

separated

defining

first

following

alternate

alternate,

data

The

key area ized in a keyed sequence. Primarily, it serves as an identifier of the key identifier are: a ber,

or After

formatting, the key contents key area follows) must also

can

be used to access

data

area

that

follows. Examples

part

number,

a Social Security number.

area

length

of

the

area

can

be

changed

content

is

changed,

be

rewritten.

the

data

when

organ-

an employee num-

is

as required.

data

area

fixed.

The

(which

If

Data Area

The

record's

addressed

data

This

mer.

6 IBM

data

and

is

organized

3350

area

contains the information

identified

and

Reference

by

the

arranged

Manual

count

by

and

key areas.

the

program-

of

a

the

Data

Records

One

or

more

data

records follow the track descriptor

The

data

record.

the

count, key, and

The

number

the

number

Data

records, formatted programmer's

OVERFLOW

The the following ments cylinder boundary.

with

record overflow function allows records exceeding

track capacity

the

can

continue

record

of

data

of

bytes

and

or

file organization.

RECORDS

HA

format

data

areas are originally written.

records

in each

track

descriptor records,

without keys depending

to

be

continued

and

RO

on

successive tracks up to

per

record

areas.

is

determined

track is

These

determined

and

track capacity.

on

the

record seg-

can

on

next track

when

by

be

the

WRITE

Write padding portion completion of format writing. Padding begins upon completion of writing initiated by a format write command chained.

PADDING

is

a process

of

a track with a special

if

another

format write command

of

filling

pattern

out

the remaining

following

is

not

3350

The feature which storage control to disconnect after the last format write while the original drive pads to

In this case, index orientation may be lost upon

reconnection to the channel.

(all modes) has a format write release

under

some conditions allows the

command

on

a track

and

to service

the

end

other

drives

of the track.

Data

Formats

7

r

Index Point

6

G1

,,..

/

Home Address

G2

RO

Area

Count

Record Zero

RO

Area

Data

G3

INDEX G 1

HOME

Supplies index.

SD ment

displacement defect second.

Note:

involving only the transparent to the using system except: ( 1) they must supplied by the system

3350

may

successful

PA address

Note:

only the

F (Flag):

Note:

between the using system and the drive.

POINT:

(gap

1):

Separates

ADDRESS

basic

(Skip

Displacement):

(in

bytes)

center, and

The

SD

native mode; (

be

sensed

Read

(Physical

verification.

The

PA

storage

Defines

Bit

0

Bit

1

Bit

2

Bits

3 - 5

Bits

6,

7

00

=

01 = 10

=

11

=

This

HA

Indicates

track

from

of

the

start

index

and

information,

Each

index

to

third

track

defect

second

home

one

two

of

all

address.

per

bytes

defect

center

tracks.

track

give

center from

from

following

displace-

the

bytes are normally internal conventions

storage

by

executing a Sense

HA.

Address):

bytes are

control and the

track

Skip Unused

Indicates ment Unused Track

Normal Normal Defective Defective

flag byte is the only

control and

for

a Write

2)

the

SD

bytes,

Storage

an

internal convention involving

condition

displacement

HA

area

status

primary alternate

HA

control

drive.

as

moved

flag

drive.

for

1/0

follows:

They are

when the drive

use in

item

chained

check

for

that is

from

for

skip

displace-

transferred

and

first

1.

CC

(Cylinder

under

Native

3330-1 3330-11

HH (Head

track)

Native

3330-1 3330-11

DCB

(Detection controller bits

be

is

in

a

or

G2 (Gap 2):

count

RECORD

RO

Count

SD·

Similar

PA:

Same

F (Flag):

Bit Bit

Bit

Bits

00

01

10

11

user

or

within

and

less.

areas.

ZERO

Area

Defines

0

1

2

3

4

5

6, 7

=

= = =

Number):

control.

Mode

Track the

cylinder

Mode

Code

used

Separates

to

home

as

home

track

Defect Defect

Defect

Unused

Logical

Unused

Track

Normal Normal Defective Defective

Specifies

Number):

under

Bytes):

for

single

home

address

condition

in

this

in

this

record

status

primary alternate

the

0-554 0-403 0-807

Specifies

user

0-29 0-18 0-18

Generated

error

address

for

count

key

field

data

field

continues

primary alternate

cylinder

the

control.

burst

and

overflow

field

on

number

head

by

the

3350

detection

record

records:

(or

of

zero

,,

ten

Figure

3. 3350

Track

Format

8 IBM 3350 Reference Manual

----

Track

Format

-------------------------------iaio1~

Data

Record

R 1-Rn /

Index

R1-Rn

Cnt

G3

~rea

',

'

G2

.._

--

''

1s1D1

s1DI

;~}I

RO

Count

Area

(continued)

CC: Same

HH: R (Record KL (Key Length):

no

keys used, value is 00.

DL (Data Length): DCB: G2 (Gap

RO

Key

KEY:

RO,

this

DCB: key area on track.

G2 (Gap 2): Separates record zero key areas.

RO

Data

DATA: (if present) areas. A

CCB (Correction up

to

bits. G3 (Gap 3): Separates all records (except

other.

as.home

Same as

Number):

Same

2):

Area

Identifies

area is

Same

Area

Contains

ten

bits

address

home

address

Normally

Specifies

as

home

address

Separates record zero

information

not

present.

as

home

address.

information

standard

Code

and

Bytes):

corrects

cc 1

""

Hrl

=

00

for

record zero.

length

of

record key area.

length

of

data area.

count

in data area. For a

Not

present

(if

identified

RO

Detects

single error

has

by

eight

single

bursts

-------------,

G2

.........

.._

.........

"-..,

' --

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

...........

--

.......

-

......

DL}CB1:m

If

and key areas.

standard

with

no

RO

used) and data

count

and key

bytes.

error

bursts

up

to

four

RO)

from

each

-:::'."",

-........

Reserve

______

......

.....

......

--..

- '-.. \

.....

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

for

Defects I

:+.::1

DATA

RECORDS

Rl -Rn

SD: PA: F: CC: HH: R (Record

on KL (Key Length):

area (in bytes). DL (Data Length):

area (in bytes). DCB: G2 (Gap 2): Separates

Rl -Rn

KEY: Used area. Use is mer.

DCB: G2:

Rl -Rn

DAT

and key (if present). DCB: G3:

Count Area

Similar

Same

as

Same

as record zero

Same

as

Same

the

number):

track

Same

Key Area

Same

Separates record areas

Data Area

A:

Contains

Same

Separates

(Rl -Rn)

to

home

as

home

(if

specified

Defines

If

zero,

Defines

as

home

to

identify

dependent

as

home

the

as

RO

data

the

records

address

address Identifies

information

-\

\

',

CCB

[~~J

address

the

by

the

key area is the

address

the

record areas.

the

information

on

application

address

area

on

number

programmer).

length

identified

a track.

of

the

omitted.

of

the

placed in and

of

the

record

record key

record data

the

program-

by

the

count

data

Data

Formats

9

TRACK CAPACITY

3350

Native

Mode

The number depends following formulas number track. allowance (overhead) has already

3330

Equal length records 13,165 (track

of

records

on

the record size and track capacity.

of

equal length records

The

home address,

Compatibility

track

that

can be recorded

can

be used to determine the

that

RO

space, and skip defect

Modes

C+KL+DL

per

track

The

can

be

placed

been

accounted for.

capadty)

(bytes per record)

where:

Note: When

the

DL

in

C = 135 if

= 1 91 if

KL

= Key

DL = Data

an

end-of-file (EOF)

the count area must be zero. The storage

KL

= 0

KL

# 0

Length

mark

is

written,

control, however, adds a one-byte data area when

writing the track balance routines must allow

EOF

mark. Programmers working with

for

this byte by

subtracting one byte from the track balance remain-

ing. The standard 135 -byte overhead allowance

should therefore

be

increased to

136

for

each

EOF

written.

The

number

lengths

of

one

Where

13,298

of

records

that

can

be

the

following equations.

RO

is

standard:

13,165

RO

is

not

~[KL(O)+DL(O)+C-10]

(n)

of

different key and

recorded on a track must satisify

n

~~

(KLi+DLi+C)

i=

1

standard:

n

+~

i=l

data

[KLi+DLi+C]

on

Equal

length records

track

a

where:

C+KL+DL

C

KL DL = Data

The

number lengths one

of

Where

19,442

Figures 4 length records capacity in both records is shown. keys, and

of

records

that

can

be recorded

the following equations.

RO

is standard:

n

19,254

RO

~[KL(O)+DL(O)+C-3]+~

~~

(KLi+DLi+C)

i=l

is

not standard:

and

5 give the maximum

on

a track.

number

There

one

with keys.

19,254 (track capacity)

(bytes per record)

= 185 if

= 267 if = Key

KL

KL#

Length

(n)

of

different key and

on

a track must satisify

n

[KLi+DLi+C]

i=

1

number

The

track

and

of

bytes

and

number

are two tables,

For

drives being used in

= 0

0

of equal

cylinder

one

without

data

of

compatibility modes, use the capacity tables in the

Reference Manual

Order

No.

GA26-1615.

for

IBM

3330

Disk Storage,

10

IBM3350

Reference Manual

Record

length

(Dl

Bytes) (Records)

19,069

9,442 6,233

4,628

3,665 3,024

2,565 2,221 1,954 1,740

1,565 1,419 1,296 1,

190

1,098 1,018

947 17 884 828 777 20

731 690 652 617 585

555 26 528 502 478 456

436 416 398 33 381 365

349 335 321 308 296

284 273 262 252 242

233 224 216 207 49

200

192

Track

Capacity

1 2 3 4 5

6 7 8 9

10 11

12 13

14

15 16

18 19

21 22 23 24 25

27 28 29 30

31

32 34

35 36

37 38 39 40

41 42 43 44 45

46 47 48

50 51

(Bytes)

19,069 18,884 18,6991 18,5121 18,325

18, 17,955 17,763

17,586

17,400

17,215

17,028

16,848

16,660

16,470 16,288

16,099 15,912 15,732 15,540

15,351 15, 14,996 14,808 14,625

14,430 14,256 14,056 13,862 13,680

13,516 13,312 13, 12,954 12,775

12,564 12,395 12,198 12,012 11,840

11,644 11,466 11,266 11,088

10,890 10,718

10,528 10,368 10,143 10,000

9,792

144

180

134

Cylinder Capacity

(Records) (Bytes)

30 60

90 120 150

1801

210 240 270 300

330 360 390 420 450

480 510 540 570 600

6301 660

690 720 750

780 810 840 870 900

930 960

990 1,020 1,050

1,080 1,110 1,

140 1,

170 1,200

1,230 1,260

1,290 1,320 1,350

1,380 1,410 1,440 1,470 1,500 1,530

572,070 566,520 560,970 555,360 549,750

544,320 538,650 533,340 527,580 522,000

516,450 510,840

505,440 499,800 494,100

488,640 482,970 477,360 471,960 466,200

460,530 455,400 449,880 444,240 438,750

432,900 427,680 421,680 415,860 410,400

405,480 399,360 394,020 388,620 383,250

376,920 371,850 365,940

360,360

355,200

349,320 343,980 337,980 332,640 326,700

321,540 315,840 311,040 304,290 300,000 293,760

I

Figure 4. Record

Capacities,

Without

Keys

(Part I of

2)

Data

Formats

11

Record Length

Track Capacity Cylinder Capacity

(DL Bytes) (Records) (Bytes) (Records) (Bytes)

185 178 171 165 158

152 146 141 135 130

125 120 115 111 106

102

98 94 90 86

82 78 75 71 68

65 61 58 55 52

49 46 44 41 38

36 33 31 28 26

24 22

19 17 15

13 11

9 99 7 5 3 1

52 53 54 55 56

57 58 59 60 61

62 63 64 65 66

67 68 69 70 71

72 73 74 75 76

77 78 79 80 81

82 83 84 85 86

87 3, 88 89 90 91

92 93 94 95 96

97 98

100 101 102 103 103

9,620 9,434 9,234 9,075 8,848

8,664 8,468 8,319 8,100 7,930

7,750 7,560 7,360 7,215 6,996

6,834 6,664 6,486 6,300 6,106

5,904 5,694 5,550 5,325 5,168

5,005 4,758 4,582 4,400 4,212

4,018 3,818 3,696 3,485 3,268

132

2,904

2,759 2,520 2,700 2,366

2,208 2,760 2,046 1,786 1,615 1,440

1,261 1,078

851 700 505 306

1,560 1,590 1,620 1,650 1,680

1,710 1,740 1,770 1,800 1,830

1,860 1,890 1,920 1,950 1,980

2,010 2,040 2,070 2,100 2,

130

2,

160

2,

190 2,220 2,250 2,280

2,310 2,340 2,370 2,400

2,430

2,460 2,490 2,520 2,550

2,580 2,610

2,640

2,670

2,730

2,790 2,820 2,850 2,880

2,910 2,940 2,970 3,000 3,030 3,060 3,090

288,600 283,020 277,020 272,250 265,440

259,920 254,040 249,570 243,000 237,900

232,500 226,800 220,800 216,450 209,880

205,020

199,920 194,580 189,000 183,180

177,120 170,820 166,500 159,750 155,040

155,150 142,740 137,460 132,000 126,360

120;540 114,540 110,880 104,550

98,040 93,960

87,120 82,770 75,600 70,980

66,240 61,380 53,580 48,450 43,200

37,830 32,340 26,730 21,000 15,

150

9,

180

3,090

12 IBM

Figure

4.

Record

3350

Reference Manual

Capacities,

Without

Keys

(Part 2 of

2)

Record

(Dl

length

Bytes)

18,987

9,360 6,

151 4,546 3,583

2,942 2,483 2, 139 8 17, 112

1,872 1,658 10

1,483 1,337 12 1,214 1,108 14 1,016

936 865 802 746 695

649 608 570 535 503 25

473 26 446 420 396 374

354 334 316 299 283

267 253 239 38 226 214

202

191 180 170 160

151 46 142 134

125 118

110

Track Capacity Cylinder Capacity

(Records) (Bytes) (Records) (Bytes)

1 2

3 4 5

6 7

9 16,848

11

13 15

16 17 18 19 14, 20

21 22 23 13, 24

27 28 29 30

31 32 33 34 35

36 37

39 40

41 42 43 44 45

47 48 49 50 51

18,987 30 18,720 18,453

184 120

18, 17,915

17,652

17,381

16,580 16,313

16,044 15,782 15,512 15,240

14,978 14,705 14,436

174

13,900 13,629

13,376

110 12,840 12,575

12,298 12,042 11,760 11,484 11,220

10,974 10,638 10,428

166

10,

9,905 9,612

9,361 1, 9,082 8,914 8,560

8,282 8,022 7,740 7,480 7,200

6,946 6,674 6,432 6,

125

5,900 5,610

60 90

150

180 210 240 270 300

330 360 390 420 450

480 510 540 570 600

630 660 690 720 750

780 810 840 870 900

930 960 990

1,020

1,050 1,080

110

1,

140

1,

170

1,200 1,230

1,260 1,290 1,320 1,350

1,380 1,410 1,440 1,470 1,500 1,530

569,610 561,600 553,590 545,520 537,450

529,560 521,430 513,360 505,440

497,400 489,390

481,320 473,460 465,360 457,200

449,280 441,

150 433,080 425,220 417,000

408,870 401,280 393,300 385,200 377,250

368,940 361,260 352,800 344,520 336,600

329,220 320,640 312,840 304,980 297,

150 288,360

280,830 272,460 264,420 256,800

248,460 240,660 232,200 224,400 216,000

208,380 200,220 192,960 183,750 177,000 168,300

Figure

5.

Record

Capacities,

With

Keys

(Part I of

2)

Data

Formats

13

Record Length

(DL Bytes) (Records)

103

96 89 83 76

70 64 59 59 53 48

43 38 33 29 24

20

16 12

8 4

Figure

5.

Record capacities, With Keys

Track

Capacity Cylinder Capacity

180

112

560 284

(Records)

1,560 1,590 1,620 1,650 1,680

1,710 1,740 1,770 1,800 1,830

1,860 1,890 1,920

2,010

2,040

2,070

2,100

2,130

52 53 54 55 56

57 58

60 61

62 63 64 65 66

67 68 69 70 71

(part

(Bytes)

5,356

5,088 4,806 4,565 4,256

3,990 3,712 3,481 3, 2,928

2,666 2,394 2, 1,885 1,950 1,584 1,980

1,340 1,088

828

2 of 2)

(Bytes)

160,680 152,640 144,

180 136,950 127,680

119,700 111,360 104,340

95,400 87,840

79,980 71,820 63,360 56,550 47,520

40,200 32,640 24,840

16,800

8,520

14

IBM

3350 Reference Manual

Page of GA.26-1638-1 Revised By

TNL:

Jan.

31, 1978

GN26-0342

This section describes the

Input/Output

operations

used with the 3350. Additional information about the

central processing unit

control of

System/

DR.IVE

Each

I/0

operations

3 70 Principles

MODES

3350

drive can be operated in one of three

(CPU)

is

found in The

of

Operation.

and channel program

IBM

modes: 3330-1 compatibility, 3330-11 compatibility, or

3350

native. Units are shipped with drives format-

ted in the mode as specified by the customer. Changes

CE

in mode require

and customer action.

Drive Addresses

The

I/O

drive address

(Figure 6). The parity bit made for odd parity and the remaining eight bits are used to designate the required drive.

Bits 0 and 1 are the storage control address bits. non-existent storage control is addressed, condition code 3

On

is

indicated.

all real 3330, 3340,

either native or 3330-11 mode, there

logical volume

on the 3330-1 mode, there are two logical volumes drive.

The bit 2 function depends

If

the storage control has no 3330-1 compatibility mode attached, bit 2 (together with bits 0 and 1) functions as a storage control address bit.

If

any attached

3350 3330-1 compatibility mode, bit 2 correct logical device

(0), the primary logical device dressed. When bit 2 device

is

addressed.

Bits 3 and 4 are the string address. This allows a maximum of four storage strings to be attached to one storage control. Each string (of up to eight physical drives) may contain only 3350s, or only 3330s, or only 3340s (not 3344s); the combination of compatibility and native mode 3350s.

If

bits 3 and 4 address a string

powered off, or disabled by the string switch, condi-

is

tion code 3

indicated.

is

an 8-bit byte plus a parity bit

is

discarded

or

3350

a drive. When a

on

the string configuration.

3350

after

drives operating in

is

only one

3350

operating in the

drives are operating in the

is

used to select the

on

the drive. When bit 2 is off

on

the drive is ad-

is

on

(1),

the secondary logical

3350

strings can be in any

that

is non-existent,

a check is

is

operating in

on

If

a

Input/

Bits 5, 6, and 7 select one of the eight drives

is

string. Unit check down

or

non-existent. Addresses of the storage controls and string controllers are established user

and

plugged at installation by the CE.

A maximum of

returned

32

physical drives can be addressed

Output Operations

on

the

if

the drive

is

powered

by

the

through a single storage control. When 3350s are operating in the 3330-1 compatibility mode, 64 logical drive addresses are available. Smaller configurations of 8, 16, or 32 drives can be addressed

but

require

different plugging arrangements by the CE. The

smaller addressing configurations require fewer unit

control words to be available in the channel.

Valid 3350 Addresses

When any mode there are 36 valid secondary address ranges as shown in Figure

and requires two logical addresses per spindle. When a 3350

mode and 3330s storage control, only primary addresses can be used.

When the 3350s are operating in either 3330-11 compatibility ranges are available for each storage control. These address ranges are shown in Figure 8.

Additional addressing information is found in the applicable storage control reference manual and in the

3350/3344

0

Storage

Control

Address

"

When through address.

Figure

3350

is operating in 3330-1 compatibility

7.

The

3350

operates as two

is

not

operating in the 3330-1 compatibility

and/

or

3340s are attached to the

or

3350

native mode, 72 valid address

Installation and Conversion Guide.

1

I

less

4 can

6.

Drive Addressing

2"

Logical

Drive

Selection

(3330-1

Compati-

bility

Mode

only)

than

64

become

3* I 4*

String

Address

(max.

Li,)

addresses are

part

of

the

storage

_ _j_

configured,

3330-ls

5

I 6 I

Physical Drive

Address

(max. 8)

bits

control

7

2

Input/Output

Operations

15

I Primary j Secondary Addresses

~~.dresses

L---_0

__

0-_0_7

I 00-01_ 10--11 20-21,

I

I I

I

! 18-1F

00-0F

00-1 F

08-0F

08-0F, 18-1 F I 28-2F,

~------+--------1---------1

i

i-------------+-------+-------;

10-17

10-ff

----+-------+-------I

40-41

I

L 40-47,

I

r---------·------+-------+-------1

50-57

40-4F

50-5F

I . 58-5F

r----8_0-_8_7

- 80-87,

r 80-8F AO-AF

,____

__

! 80-9F 1 AO-BF

l

_____

Lss-sF,

~

___

L _

90-97

_

8_8_-8

__ F __ 98-9F

90-J)_J

__

_jl0-9F~,

L 98-9F

I CO-C7

r-----------+--------+--------1

I CO-C7,

I

r------------~---~-------<

L

_____

!

i C8-CF E8-EF 16

r CS-CF,

~-Dc;--D--7----+---F-O--'---F7----+----1-6--~

1-

! !

L

___

00-07

CO-CF

c_o_-o_r_:

08-DF

DO-OF I

__Q_§::__9_i

I Addresses ReQuired

__

,__

__

2_0-_2_7

__

30-37

I 20-2F

20-3F

I

----it-------+------~

I

i

I

__

+i

___

,__

~!'--

~,

__

1-

___

~l

28-2F

30-37

30-3F 38-3F

60-s1

60-67,

60-6F

70-7F

___

7_8_-7_F

__

A_O-_A_7

AO-A7,

__

A_8_-_A_F

AB-AF, BS-BF

___

B_0_-_8_7

___

B_O_-_B_F 88-BF

EO-E7

EO-E7,

I

EO-EF

__

E_O_-_F_F

E8-EF, F8-FF

FO-FF

___

F_8_-F_F

38-3F

70-77

__

______

B0-87

__

__ __

FO-F7

__

.__

-+-

+-

--+-

+-

--1-

~

__

___

__

___

1_6 _ ____, 32 32 64

16 32

16

32

16

32

16_~-1

1_6 _ ____, 32 32

64

1_6

__

~

32

1_6

__

__,

3_2

__

~

16

16 32

32

6_4

__

~

32

16

__

~

Address Ranges Addresses

from

00

to

7F

00-07

00-07,

08-0F, 18-1 F 16

20-27,

28-2F,

40-47,

48-4F,

10-17 00-0F 00-1 F 08-0F

10-17 10-1 F 16 18-1 F 8

-20-27 8 30-37

20-2F 20-3F 28-2F

38-3F

30-37 30-3F 38-3F 40-47

50-57

40-4F 40-5F 48-4F

58-5F

50-57

50-5F 58-5F

60-67

60-67,

68-6F,

7060-6F 60-7F 68-6F

78-7F 70-77 70-7F 78-7F

77

Required from

8 16 80-87, 16 32

8

16

32

8

16

8

16

8 8

16

32

8

16

8

16

8

8 16 16

32

8

16 E8-EF, F8-FF

8

16

8

Address Ranges

80

to

FF

80-87

90-97 80-8F 80-9F 88-8F

88-SF,

98-9F 90-97 90-9F 98-9F

AO-A7

AO-A7,

A8-AF,

CO-C7,

C8-CF, D8-DF

AO-AF AO-BF A8-AF

80-87 BO-BF 88-BF CO-C7

CO-CF

CO-DF

C8-CF

D0-07 DO-DF 08-DF

EO-E7

EO-E7,

EO-EF EO-FF E8-EF

FO-F7

FD-FF F8-FF

B0-87

88-BF

D0-07

FO-F7

Figure

7.

16 IBM

Addresses

3350

Reference

for

3330-1

Compatibility

Manual

Mode

Figure 8.

bility

Mode

Address

Ranges

for

3350

Native

or

3330-11

Compati-

Seek

Addresses

Seek

Time

A specific track address addresses consist are zero, bytes 2 bytes 5

The access mechanism. tion required track.

The normally corresponds to bytes 2 through 5 of the seek address. preceding each the physical cylinder written by the storage control, are used for seek

verification. When

control, head The acceptable seek address ranges for the operating

Operating Mode

Native

3330-1 3330-11

together

and

Byte 0 2 3 4 5

Function 0 0

cylinder address may require

of

the correct

CCHH

The

the seek address is received by the storage

it

address and

on a 3350

with a Seek command. All seek

of

exactly six bytes. Bytes 0,

and

3 specify the logical cylinder,

6 are the logical

The

head address involves selec-

read/write

part

of

the

count

three physical address

count

area

and

head

is

converted

modes are:

Data

cc

0-554 0-403 0-807

into the physical cylinder

sent

to

the

Tracks

HH

0-29 0-18 0-18

drive

is

selected by the seek

head

address to be used.

c c

head

area

and

home address reflect

address.

3350

H H

movement

to

cover the

and

home address

(PA)

The

for seek operations.

Alternate

Tracks

cc

555-559 404-410 808-814

by the

bytes

PA

3350

HH

0-29

0-18 0-18

and

bytes,

and

l

and

Seek time heads correct cylinder required for a access time 25 milliseconds.

When data required.

Head

The head

is

the time required to move the

to

the

correct

cylinder, the seek time

is

required, a minimum

one

is

50

fixed

head

is

in the fixed head cylinders, no seek time

Selection Time

time required

is

negligible.

Latency

The

3350

drives

revolutions specific record maximum

milliseconds

timing purposes.

3350s

All capability permits channel record used period.

per

minute.

to

of

16. 7 milliseconds.

(the

utilize rotational position sensing. This

during the time required to bring the

to

the

read/write

by

the

channel

cylinder.

cylinder change.

milliseconds, and

models are involved

to

select the required

rotate

at

reach the

average delay),

the

drive to disconnect from the

and

If

the

heads

is

zero.

of

10

The

the

a nominal

The

time required for a

read/write

head.

storage

speed

Half

is

generally used for

Other

control

milliseconds

and

a revolution,

drives

read/write are

at

the

If

a different

maximum

average time

the required

is

read/write

of

3600

heads

is

a

correct

can

be

during this

is

8.4

ACCESS AND DATA

The

total time required consists of seek time latency time,

and

data

(if

transfer

TRANSFER

for

access

and

required),

head

time.

data

transfer

selection time,

Data

The

nominal

1,

198,000

byte.

Transfer

data

bytes

Rate

transfer

per

second

rate

of

the

or

0.835

Input/Output

3350

is

microseconds

Operations

per

17

DATA INTEGRITY AND SECURITY

The

3350

protects

and

error

correction.

provided through use

and

tion,

file protection.

data

integrity by

Data

of

security

write

error

and

protect,

detection

privacy are

seek verifica-

that

A non-compare indicates not properly positioned.

reposition the access mechanism

If

command retry

ended

with unit check and sense information equipment check, indicated in

byte

is

unsuccessful, the operation

permanent

7,

message

the access mechanism

Command

error,

A.

retry

is

used to

to

the correct track.

that

and

seek

error

is

posts

Write

The write erased each drive causes any write command to The ed the sense information indicates write inhibited (byte

bit 6)

Seek

The

count

verification. When the

processed during a read bytes are compared with

Protect

protect

or

rewritten. A switch in the control panel

switch

or

can

not

busy.

and

command reject

Verification

3350

track format includes three

area

and

function prevents

be changed when the file

When

a write command

(byte

home address

count

or

search operation, the three

the

most

data

0, bit 0).

bytes

that

are used for seek

area

or

home address

recent

from being

of

be

rejected.

is

not

select-

is

rejected,

in

each

seek address.

is

l,

File Protection

The

Set File Mask instruction in a chain of channel

the

commands describes

can

be performed. operation status byte followed

bytes.

are used to indicate which functions are to be inhibited.

A description in the

is

attempted,

The

various bits in

3830-2

of

the Set File Mask command is given

and

write and seek functions

If

an

inhibited write

a unit check is generated in the

by

command reject in the sense

the

Set File Mask command

ISC Reference Manuals.

or

seek

that

18 IBM

3350

Reference Manual

Error

recovery usually involves storage system-invoked actions. vary

depending

on

how

These

and

recovery actions

to

what

attached.

the

Recovery actions involving 3830-2) topics:

Table,

ERROR

The

and

the

Error

Correction

and

Error

CORRECTION

error

correction function

attached

Recovery Action.

recovery action procedure.

data

check

correctable

ECF

algorithms

are described in

(3830-2

ERROR

The

or

ISC).

CORRECTION

error

correction

bit configurations

0,

1,

and

bytes

2.

is

and

the

storage

table (Figure

set

by

Each

related recovery

of

storage

3350s

Function,

FUNCTION

(ECF)

It

is

used

posted

for a

control

TABLE

the storage

these unique configurations requires a specific recovery action the

system.

ERROR

The the

tion

action table may specify command restart

RECOVERY ACTION

3350

recovery action table (Figure

actions

shown

to in the

words.

CCWs

be

taken

error

The

follow.

for

condition table.

construct

instructions

each

sense

CCW Restart Construction

If

sense

byte

1,

error

occurred

error

recovery procedures

continue

the

operation

table specifies

RESTART

1.

2.

The

byte

The plus

CCW 1

command

3.

data

the

residual count.

bit 7 (operation

after

data

transfer

normally.

the

restart

CONSTRUCTION

code

address

count

of

is

that

incomplete) is on,

can

correct

CCW

required,

byte

is provided in sense

of

the

CCW,

control

system the

control

are described in

Error

Condition

is

part

of

the

whenever

data

area.

procedure

reference manuals

9)

identifies sense

control

to

be invoked

restart

for

had

The

in sense

10)

specifies

byte

configura-

The

recovery

channel

constructing

started. the

The

error

recovery action

either 1 or

interrupted

minus

the

CSW

and

can

3350

(ISC

three

a

The

by

an

and

CCW,

or

2.

Page of GA26-1638-I Revised By

TNL:

Jan.

31, 1978

GN26-0342

Error Recovery

3.

The

flags,

except

(PCI),

is

4.

The the command specify a read,

REST

ART

1.

The The

2.

are those

count

residual

turn

CCW 2

command count

a.

Fetch

was a write,

byte

on

CONSTRUCTION

CSW-8,

b.

Subtract count positive, go

program

of

is

the residual

count

is zero, use a

having '

the skip bit.

code

is

constructed

the

count

and

set a

the

restart

obtained

to

controlled

the

interrupted

count

in the CSW.

count

the

data

address should

00

' .

If

command

is

provided in sense

as follows:

of

the

CCW

pointer

to

this

displacement from the

in

step

a.

If

this result is

step

f;

otherwise, go

interrupt

CCW.

of

one.

was a

byte

designated

CCW.

to

step

If

3.

by

c.

Check designated set, go

d.

Advance CCW count CCWs

Truncation

e.

2 clude

f.

Set result step

3.

The

flags (except designated is

also

4.

The

data by

the CCW, step

2.

If

another during a while executing the CCW

count

the

of

3.

by

set

if

address

pointer

minus

operation

Read

can

be

the chain

by

to

step

the

pointer

in

the

data

to

the

counts

in the

occurred. Set

equal

skip

Restart

the

subtraction

PCI)

the

pointer

step

2e

is

in

step

the

restart

Multiple

generated

data

flag

of

the

CCW

the

pointer.

e; otherwise, go to

chain

of

data

chain.

to

1.

Go

bit

in

the

CCW 2 count

are those

If

to

the

all previous

Return

the

to

step 3 and

restart

in

step

of

in

step

2.

the

flag is

step

non-TIC

this

to

restart

CCW

equal

b.

the

CCW

The

non-TIC

step

to

Go

skip bit

was previously executed.

that

of

the

CCW

designated

2e, plus the

CCW

incomplete

CKD

restart

CCW, a new

from the old

count

generated

or

an

command

restart

of

error

occurs

restart

not

d.

CCW

b.

CCW

in-

flags.

the

to

that

in

ccw.

Note:

Be

sure

to

avoid destroying the old restart

CCW

before generating the new one.

Error

Recovery 19

Page

of

G A26-l 638-I

Revised

By

Error

Jan.

TNL:

GN26-0342

Correction Table

31, l 978

Bit

0

rB~e

i 1 .

~i

-·---

_}-+Equipment

rt=

,___...._._.

1

0

1 7

0

1

2 1

0

2 1

0 5

1 0

1 1 Invalid Track 1 2 End

1

1 7 1 4 1

I

1

1 7 I

I

1 7

2 3 Environmental

Command Command

0

Write

6

--

1

Intervention

2 Bus

3 I

Equipment

_0_

Permanent

1

4 Data Check

i

4

I Data Check 0

Permanent

0

4 Data Check

Operation

4 Data Check

7

Operation Correctable

4 Data Check

Correctable

10verrun

Overrun Permanent

2

J End

I

Operation

I

No

5

I File

i

I

5 I File

Operation Operation

I Data Present

Name

Reject Reject

Inhibit

Required

Out

Parity

Check Check

Error

Incomplete

Error

Format

of

Cylinder

of

Cylinder

Incomplete

Record Found

Protect

Incomplete Incomplete

Programming

A

write

in

the

Read

Drive

offline

out

Bus Equipment Equipment

storage

check

Data command.

Uncorrectable ed.

check

Data but

not a data-field

Correctable segment,

Correctable the

last

Service overrun in segment, CKD.

Storage

Track

capacity Cylinder Cylinder

Record

The seek violated

A read

After

start either a defective error

in

Statistical

error.

command

position.

or

not

parity

error. malfunction. malfunction,

control

overflow

control

not

the

or

the

retry

not

correctable

data check,

in

second

data

not

the

data

during a format

exceeded. boundary boundary

found

command

file

write

overflow

of

data

second

usage I

General

received

plugged

exhausted

or

correctable

check

last

segment.

check

segment.

second

retry

exhausted

detected detected

in basic

or

mask.

transfer

or

alternate

or

subsequent

error

Description

with

the

for

the

or

with

a Read

storage

subsequent

error.

in

the

data area

in

the

data area

or

subsequent

write,

or

on

during during

command

read/search

violated

log

the

during

track

information

write

inhibit

switch

address.

undesirable.

Multiple

control

overflow

of

or

a Read

a service overrun.

multitrack

overflow

sequence.

multitrack

file mask.

an

overflow

condition

segment

is present.

retry

exhaust-

segment

an

overflow

data area

overflow

Multiple

operation.

operation

operation,

or

a seek

was

found.

CKD

of

Action

2 No

1

3

4 s

·-1-

1

4

1 Yes

I

68

6

5

4 Yes

1

2

8

9

2

10

11

7

3 Yes

logged

No

Yes

(See Note.)

I

~

Yes

I

'

I

No

~

Yes

No No No

No No

No

I

--

I

--

I

1

j

i

I

Note:

Figure 9.

20

IBM

If

sense byte 10, bits 4 and 5 are zero,

Error

3350

Correction

Reference

Table

Manual

no

recording action

is

performed.

Page of GA26-1638-1

Revised

By

TNL:

Jan.

31, 1978

GN26-0342

Recovery

Action

1 Print console

2

3

4

5

5A

58

Note#:

byte

Get the cylinder bytes and the high-order head byte

from sense

Table

error

message

Exit

with

programming

a.

Repeat the operation once.

b.

If

the error

Repeat the operation.

a.

b.

If

the

a.

Perform error correction Examine

b.

has been corrected. (User is operating in

c.

Examine

otherwise, continue

If

the user's chain has

of

this

Note:

non-TIC

d. Continue the user's chain

Seek (see Set File

Read Home Search Equal ID (CCHHR TIC*-8 TIC (CSW)

Continue

Seek (see Set File Read Home Search Equal ID (CCHHR

TIC*-8

Read

TIC (CSW)

This action is used

been processed. Reconstruct a.

Construct

b.

Set

command

Restart the operation

Seek

Set File

Read Home

Search Equal ID (CCHHR TIC*-8

Read

TIC (CSW)

byte

6, bits

condition

error

condition

bit 7 of

the

CCW

If

data chaining is indicated in the interrupted

CCW

Mask

the

user's chain by executing:

Mask

Count

Mask

Mult

the

interrupted

is on (count area).

past the last

Addr

to

Restart

code

Addr

CKD (from step

3-7.

for

operator

error

or

unusual condition indication.

persists,

persists

function.

file mask (PCI).

CCW

with

this

not

been completed, examine the

CCW

by

executing

restart a Read

the

CCW

2.

to

'5E'.

through

the

do

after

step.

Read

following

Explanation

and I

or

customer

action

1.

10

retries,

If

off,

go

PCI

(CSW-8):

go

to

If

step d.

it

is a Read

If

in the data chain.

the

following:

Note

# below) (same as original) (skip

bit

on)

from

(channel status

Note

# below) (same as original) (skip

bit

on)

from

(skip

bit

on)

(channel status

Multiple

(see (same as original) (skip

(if

CKD data recovery process

Multiple

Note#

bit

user's chain has

CKD as

chain:

below)

on)

from

b)

from

engineer notification, (see Figure 10,

do

action

1.

to

step

c.

If

on, return

fetch

mode

and

Multiple

bit

3 is

off,

do

action 5A.

CCW,

the preceding test must

sense bytes 8-12)

word)

sense bytes 8-12)

word)

follows:

sense bytes 8-12)

not

been completed)

to

must

supply

CKD

command ( '5E').

CCW

after

user

with

indication

own

restart recovery action.)

in

the

user's chain.

be

a correctable data check has

part

4).

that

the

do

action

58;

If

bit

executed on the

the user, not from the sense bytes. Get the low-order head

data

3

first

Figure I

0.

Recovery Action

Table

(Part

I of 4)

Error Recovery

21

Page

ot

0A26-l

638-I

Revised

By

Jan.

31, 1978

TNL: GN26-0342

Recovery Action Table (continued)

Action

6

68

a.

Perform error

b. Examine

has been corrected. (User is operating in

Increment

c. d.

Construct

e.

Complete Seek Set

File

Set

Sector Search ID Equal (record TIC*-8

Restart

TIC (CSW)

Note:

If

the modified seek argument is not within the user's extent,

before issuing the Seek.

a.

Examine been corrected. (User is operating in

b.

Construct Complete

c.

following: Seek (see Set

File

Set

Sector Search ID Equal TIC*-8

Restart

TIC (CSW)

Note: before issuing the Seek.

If

the modified seek argument is not within the user's extent,

bit 7 of

the

restart

the

Mask

CCW

bit 7 of

restart

the

Mask

CCW

correction

the

file

seek

argument

CCW

interrupted

2

If

that is impossible,

the

file

CCW

interrupted

2

If

that

function.

mask

2. operation

mask

2. operation

is

impossible,

(PCI).

by

(PCI).

Explanation

If

off,

go

to

PCI

one

(see

and (argument (same as original) (argument

(channel

If

off,

PCI

and

Note (same as original) (argument 0) (record

(channel

fetch

Note#

continue

from

0)

1)

status

word)

/OS

must

go

to

fetch

mode

continue

# below)

1)

status

word)

/OS

must do action 2.

step

c.

mode

below).

the

user's

step

c)

do action 2.

step

b.

and

the

user's

If

on, return

and

must

chain

If

on, return

must

chain (if appropriate) by executing

to

user

with

indication

supply

(if

IDS

must

supply

/OS

must supply the correct seek argument

own

restart recovery action.)

appropriate) by

executing:

supply the correct seek argument

to

user

with

indication

own

restart recovery action.)

that

the

data has

the

data

'

Note#:

byte from

Figure 10. Recovery

Get the cylinder bytes and the high-order

sense byte 6, bits

Action

3-7.

Table

(Part 2 of

4)

head

byte

from the user, not from the sense bytes. Get the low-order head

22

IBM

3350

Reference Manual

Recovery Action

Table

(continued)

Action

7

8

9

a.

Construct Construct

b. c.

Continue Seek Set Set Search ID Equal (record 1) TIC*-8 Restart TIC (CSW)

a.

Increment

b.

Continue Seek

Set Set Read

TIC

Note:

If

before issuing the Seek.

a.

Increment

b.

Construct

c.

Complete following: Seek Set Set Search ID Equal TIC*-8 Restart TIC

Note:

If

before issuing the Seek.

seek

argument

restart

user's

File

Mask

Sector

CCW

the

File

Mask

Sector

Home

(CSW-8)

1

the

cylinder

operation

Addr

CCW

chain

the modified seek

the

cylinder

File

Mask

Sector

CCW

(CSW)

restart

the

CCW

interrupted

1

(see

1.

by

executing

address

by

executing

argument

If

that is impossible,

address

1.

operation

the modified seek argument is not within the user's extent,

If

that is impossible,

Explanation

Note#

below).

the

following (argument (same as original) (argument

(channel

of

the

(argument (same as original) (argument

(skip

(channel

status

user's

the

following:

bit

on)

status

from

0)

seek

from

0)

word

chain:

step

a)

word)

argument

step

a)

-8)

is not within the user's extent,

/OS

must do action 2.

of

the

user's

seek

argument

and

continue

(argument (same as original) (argument (record

(channel

1)

status

IOS

from

O)

must

the

step

word)

do

user's

a)

action 2.

by

one.

/OS

by

one. Reset

chain

(if

/OS

Set

the

head

address

to

zero.

must supply the correct seek argument

the

head address.

appropriate)

by

executing

the

must supply the correct seek argument

Note#:

byte

from

Figure

Get the cylinder bytes and

sense byte 6, bits

I 0.

Recovery

Action

Table

3-7.

(Part 3 of

high-order

4)

head byte

from

the user, not

from

the sense bytes. Get the

low-order

Error

Recovery 23

head

Recovery Action

Table

(continued)

Action

10

10A

11

a.

Determine

b.

Continue Seek (user's Set

Set

Sector

Read

TIC (CSW) (channel

Note:

If

before issuing the Seek.

a.

This Continue

b.

Seek Set Set Read

TIC

Note:

If

before issuing the Seek.

a.

Increment

b.

Construct

c.

Complete

following:

Seek Set Set Search

TIC*-8

Restart

TIC (CSW) (channel

if

the

interrupted

the

operation

File

Mask

Home

Addr

the modified seek

is a

multitrack

the

operation

File

Mask

Sector

Home

(CSW-8)

Addr

If

operation.

command

by

executing

argument

that is impossible,

by

executing

the modified seek argument is not within the user's extent,

If

that is impossible,

the

user's

seek

argument

restart

CCW

1.

the

interrupted

File

Mask

Sector

ID

Equal (record

CCW

1

operation

Explanation

is a seek.

the

following:

argument, (same as original) (argument (skip

bit

on)

status

is not within the user's extent,

/OS

Increment

(argument (same as original) (argument (skip (channel

the

following:

bit

on)

status

the

/OS

by

one

and

continue

(argument (same as original) (argument

1)

status

O)

must

user's

from

0)

must

(see

from

0)

If

yes,

see

word)

do

step

word

do

Note#

the

step

word)

go

Note#

action 2.

seek

a)

-8)

action 2.

below).

user's

a)

to

step

b.

If

not,

below)

IOS

must

supply the

argument

chain (if appropriate)

/OS

by

one (see

must

supply the

do

action

correct

Note#

correct

by

executing

10A.

seek argument

below).

seek argument

the

Note#:

byte

from

Figure

10.

24 IBM

Note:

If

the modified seek argument is not within the

before issuing the Seek.

Get the cylinder bytes and the

sense

byte

6, bits

3-7.

Recovery

3350

Action

Table

(Part 4 of

Reference Manual

If

that is impossible,

high-order

4).

head

byte

/OS

from

user's

must

do action 2.

the user, not

extent,

from

/OS

must

supply the

the sense bytes. Get the

correct

seek argument

low-order

head

The

following commands are recognized

11

by the 3350. (See Figures

The three diagnostic commands are on(v used when

microdiagnostics from the

CONTROL

•

No

Operation

• Recalibrate

• Seek

• Seek Cylinder

• Seek

• Space

• Set File Mask

• Set Sector

•

Restore

• Diagnostic

• Diagnostic Write

SEARCH

• Search

• Search ID Equal

• Search ID High

• Search ID Equal

• Search Key

• Search Key High

• Search Key Equal

COMMANDS

Head

Count

Load

COMMANDS

Home

Address

or

Equal

High

or

through 16.)

System/

Equal

High

and

executed

3 70 are required.

READ

•

SENSE

• Sense

• Read

• Diagnostic Sense

• Device Reserve

COMMANDS

Read

Data

Read

Key

Read

Count,

Read

Record

Read

Count

Read

Home

Read

Initial

Read

Sector

Read

Multiple

COMMANDS

1/0 1/0

and

Reset

and

Data

Key,

Zero

Address

Program

Count,

Type

and

Load

Buffered

I • Unconditional Reserve

• Device Release

FORMAT

• Write e Write

• Erase

• Write

• Write Special

WRITE

Home Record

Count,

COMMANDS

Address

Zero

Key,

and

Count,

Key,

Channel Commands

Data

Key,

and

Data

Log

Data

and

Data

UPDATE

• Write

Key

WRITE

Data

and

COMMANDS

Data

Channel

Commands

25

CONTROL COMMANDS

Command

No

Operation

Recalibrate 13 Seek

Seek Cylinder Seek Head

Space

Count

Set File

Set

Restore

Diagnostic Transfers Load

Diagnostic Write

Mask

Sector

Code

Single

Track

03

07

Multi-

track

No during initial status.

Moves

1. address. Only

2. Selects the head specified

OB

18

OF

1F

23 eliminate

17

53

73

Selects head specified by

When command, locates RO), end and device end in gap When HA, G2, and following

Sets commands.

Used on disconnected tion

No channel end and device end.

only storage

Transfers and executes inline storage control. A stored transferred command. (See sense commands.)

action. Channel end and device end presented None

chained

spaces over

not

file

with

action. Zero initial

Function

the

access

chained, searches

RO

mask

the

the storage

the

in storage control. Message

to

cylinder 0 and selects head 0.

to

cylinder specified by the seek Six address

by

the

seek address. Six address bytes. Only

from

read, search,

start

of

the

count

RO

count

area. Ends

count

with

channel end and device end.

to

control

need

specified

to

the

to

main storage by a Diagnostic Sense

operation

command

for

the

control

status

512-byte

storage

16-byte

channel

write,

area, and ends

before

key

for

index, spaces over G

chaining channels

during rotational delay.

followed

data

control

test

from

error code message is

Data

Transferred

Across

None

bytes

seek address. are used

address.

five are used.

or

space

count

area (including (one byte) and DL

with

channel bytes)

area. mand.

operation

of

to

maintain

buffer.

may

in gap

write

and seek One

connec-

by

final

status

block

from

main storage

then

be

Three bytes used as KL

1,

data.

to

One angular (0-127).

of

None

read One

formation one only storage.

Maximum

to

for

lowest

for

byte

track

byte

sector

Channel

bytes

2,

3,

and 5

the

seek

bits

of

file

mask

that

specifies

position

of

control

addresses

on

the read

of

512

bytes.

(0-5).

byte

(two

in-

5

Figure I I.

Control

Commands

26 IBM 3350 Reference Manual

SEARCH

COMMANDS

Command

Search Home dress Equal

Search ID Equal

Search ID High

Search ID Equal High

Search Key Equal

Search Key High

Search Key Equal

High

Ad-

or

Single

Track

39

31

51

71

29

49

69

Code

Multi-

track

89

81

D1

F1

A9

C9

E9

Function

Locates a argument.

Locates a

Locates a (Locates any ID from

Locates a (Locates ID the ID

Locates a key area selected (The key area compared is chained from record.)

Locates a key area selected by (Same as Search Key Equal except than system key.)

Locates a key area selected (Same as Search Key Equal higher than system key.)

home

address area selected

count

area selected

count

area selected

from

the

system.) drive and track

count

area selected

from

track

that

from

system.)

from

a Read

a Read Count, the key searched is in

Count

track

is equal

by

from

or

by

except

by

that

by

the

Search ID.

the

by

the

search

the

search argument. Five bytes (CCHHR)

the

search argument. Five bytes (CCHHR)

is higher than the ID

the search argument.

to

or

higher

than

search argument. Key bytes

the

If

chained

the

same

search argument. Key bytes

finds

any key higher

searc~h

argument. Key bytes

key is equal

to

Four bytes (CCHH) HA drive and track, CCHH

next lected with system.

next CCHHR

Five bytes (CCHHR) next drive and track CCHHR

from

drive and track from

drive

or

from

Data

Compared

area

from

count

drive

CCHHR

count

from

count

from

system.

from and track system.

selected

with

the

system.

area

from

and track,

from

area

from

with

system.

area

from

with

system.

from

selected

with

from

selected

with

selected

with

of

se-

the

of

key

Figure

12.

Search

Commands

Channel Commands 27

READ

Read Data

Read Key and Data Transfers key and data areas

Read Count, Key, and Data drive

Read Record Transfers Zero

Read Count

Read Home Address

Read Initial Program Load

Read Sector Transfers one angular position byte used by next Set One byte

Read Key, and Data number

COMMANDS

Command

'

(RO)

Multiple

Count, Transfers remaining records on track

Single

Track

06

OE

1E

16

12

1A

02

22

5E

Code

Multi-

track

Transfers data area storage.

86 area

main storage. after address marker If

BE

9E

96

92

9A

KL = 0, same as Read Data. the key and data areas

Transfers count, key,

to

main storage. cord

RO storage. If

chained

immediately Transfers next

storage.

Transfers five bytes (FCCHH)

Recalibrates point, and reads Cannot be preceded by Set File in same chain.

Sector. is position not

chained, is position required

record processed by the drive.

Resets orientation information.

than the longest track length and SILi to

suppress incorrect length.

Command retry may be affected.

(count, key, and data)

from

with

count

to

cylinder 0, head 0, searches

If

chained

of

the record used in the previous CCW.

of

bytes unknown,

of

record

and

Search

no search

area (8 bytes)

R1

data

from

Function

from

drive

of

record

data areas

from

HA

or

Read HA, is executed

for

index.

from

to

main storage. Byte 0

from

drive

to

Mask

a read, write,

to

access the last

CCW

count should be larger next record (except

to

main First data area after ad-

from

drive

of

record

from

drive

to

drive

to

for

main storage. on cylinder 0, head 0.

or

Space Count

or

search CCW,

to

channel. Since Starts

bit

should be on

dress marker

of

from

count

same record.

to

First key and data areas

that

were chained area

of

Next record

after

main Record Zero

main Next record

or

first

RO.

Byte 1 = Cyl Byte 2 = Cyl Byte 3 = 0 Byte 4 = Head

index First data area

position data.

If

Data

Read

or

record chained

from

the

count area after

=Flag

at

data

or

key

of

command

the count

same record.

or

first

RO.

(RO).

count

Addr Addr

Addr

after

of

angular

count field

re-

area

RO

of

RO).

or

Figure

28

13.

Read

Commands

IBM.

3350 Reference Manual

SENSE

Command

COMMANDS

Code

Function

Data

Across

Transferred

Channel

Test

1/0

I 0

Sense I

Sense

Read and Reset Buffered

Diagnostic Sense

Device Reserve

Unconditional Reserve

Device Release

Type

1/0

Log

Single

Track

00

E4

04

A4

44

84

14

94

Multi-

track

Determines status automatically required.

Transfers seven storage

Note:

Read

sense bytes 18 through 23. Determines

reset Supplies usage

drive. Data is reset upon transfer.

Determines diagnostic

test

Reserves addressed device channel on machines. Count

Same

alternate path.

string

tion. Terminates

es

Mask

sense bytes.

control

When

HA, the skip displacement information appears in

upon

transfer.

test

to

system

multichannel

Cannot

in same chain.

as Device Reserve switch.

or

string

or

Space

of

device on channel. Generated One status byte.

by channel

bytes

type

the Sense

cause

or

type

of

(part

after a Diagnostic

Resets

Used

device reservation on switch

Count

when

of

sense data

and

drive

1/0

is chained

of

last

unit

error

logging

error(s)

follow a Set

machines.

found

of

Diagnostic

for

interfaces

Also

transfers

except

information

to

recover

in same chain.

status

type.

check. Sense data is

exclusive use by

from

Cannot

information

designating

from

data on

File

is routed

the

when

running 16

Write)

Load.

or

string

Mask

24

sense bytes.

in original path and

hardware

multichannel

follow a Set

Also

a successful

addressed

or

transfers

switch

or

Space

through

malfunc-

interfac-

File

transfers

7

bytes

trol

and drive

tion. (See Note.)

24

bytes

formation. 24

bytes

ror

logging

bytes message or 512

bytes

24

sense bytes.

24

sense bytes.

24

sense bytes.

24

of

storage

of

identifica-

sense

usage

data.

error

code

test

con-

in-

or

er-

data.

Figure

14.

Sense

Commands

Channel Commands 29

FORMAT WRITE COMMANDS

Command

Write

Count, Key,

and Data and track.

Write

Special Count, Same as

Key, and Data

Erase

Write

Home

Address

Write Zero

(HA)

Recqrd

(RO)

Single

Track

1D

01

11

19

15

Code

Multi-

track

Writes Must

ful

a record of

Same as count, key, and data areas. byte,

In home 3350 home 3350 HA

Note:

Read

sense bytes 18 through 23. Writes

Write

successful Search HA.)

one

chain

Search ID Equal,

overflow

or

ECG

3330

compatibility

address area on selected drive and track. In

native mode,

address area on selected drive and track.

native mode,

with

When

HA,

count, key, and data areas

CKD

Function

complete

(If

file

from

Write

overflow

record.)

Write

bytes are

CCW

the Sense

record on the selected cylinder Count, key, and data

mask violated, sets

Write

RO,

Write

or

Search Key Equal.)

CKD

except

for

segment.

CKD

except

writes must

count= 4 or

written

modes,

11-byte

chain

1/0

is

(No~

no

No

more

chained from a successful

writes

command

CKD, Erase, success-

flag

bit

4 (on) indicating

used

for

information

address marker, sync

with

this

command.

5-byte

(SD SD SD

from

successful Search

if

flag

bit 6 off.)

reject. areas

last

segment

is

written

(FCC

FCC

(If

the skip displacement information appears in

of

RO_,

(Same as Flag

except

must

chain

from

Write

HA

or

Data

Written

of

next cord. Data area system;

flags, gaps

control. Same as

in Bytes

HH) The

byte

HH) dress transferred

system. (See Note.)

HH R KL DL system Key and data system.

count

Write

of

zeros.

5-byte

(3350)

byte

for

from

(3330)

home

from

count

track

area,

CKD.

HA.

DL

from

re-

from

storage

or

11-

ad-

from

CC

from

area.

Figure

15.

Format

Write

Commands

UPDATE WRITE COMMANDS

Write

, Figure

Command

Data Changes data area

Key and Data

16.

Update

Write

Code

Single

Track

05

OD

Commands

Multi-

track

Function

of

a record.

sets

command

Search ID Equal

Changes key and data areas same as

mand reject.

Write

reject.

Data.

Must

or

Search Key Equal.)

If

file

chain

from

Data

(If

file

mask violated, Data

chain

from

successful

of

record. (If KL = 0, Data

mask

violated, sets

successful Search ID.) KL DL DL bytes in

com-

from number DL

DL

from

number area

of

as specified

bytes in count.

as specified by

same record.

Written

system. Byte

by

system. Byte

count

30

IBM 3350 Reference Manual

Sense Data

The status sense bytes. There are 24 bytes formats.

and

condition

Four

formats, 1, 4, 5,

of

the

3350

is

reported in the

and

seven different

and

6 describe the

3350. The remaining three formats, 0, 2, and 3 are associated with the storage control.

Only the formats used with the

3350

are explained in this manual. Refer to the following manuals for formats 0, 2, 3, and a detailed description

of

unit

status:

• Reference Manual for Integrated Storage Control,

Order

No.

GA26-1620.

• Reference Manual for

Control,

Order

No.

3830

GA

Model 2 Storage

26-1617.

SENSE

BYTE

SUMMARY

In all the formats, the first eight bytes, 0 through 7, give high-level information concerning status

and condition. Sense byte 7 identifies the format in which the remaining bytes, 8 through 24, are arrayed:

• Bits 0 through 3 indicate the format type for bytes

8 through

24

0

0 0 0 1

0 1 0

0

0 1 1

1 2

1 0 1

3

0 0 6

Format

1

4

5

• Bits 4 through 7 define a message

4

0 0 0

5 6

7

0 0

Message

I I I I I I I I

'V

1 1 1

'V 'V

I I

'V 'V

1

F

Each

of

the formats concerned with the

3350

is summarized in Figures 1 7 through 26. Figure 22 contains the applicable message for formats. Should the indicated format be 0, 2,

each

of

the

or

3,

refer to the appropriate storage control manual for

interpretation.

Sense Data

31

Page

of Revised By

TNL:

GA26-l

638-I

Jan.

31, 1978

GN26-0342

SENSE

Byte

BYTES 0

0

1 Permanent Invalid End

2

3 Restart

4 Physical Drive Identification

5

6 (See Note.)

3350/3330-11

3330-1

7 Format Message Code

THROUGH

BitO

Command Reject ti on Bus

Error

Unused Correctable

0

128

High-order

(CE)

1024

(CE)

1024 16

7 SUMMARY

1 2

lntervenRequired Parity

Track Cylinder Found Protected Inhibited

Format

1

I

64

I

logical

512

256 0

(Bits

Channel

Out

of

Alternate Controller mental Selected Data

Command

'06'

= Read operation;

2

I

low-Order

32 16

I

Cylinder Address

256

0

through

3)

3

Equipment Check

Unused

Environ-

Present

(provided only

3

I

logical

4

Data Check Overrun Unused

No

Record File

Compatibility

Mode

when

byte 1,

'05'

=

Write

(1

out

of

4

I

Cylinder

I

Address

8

5 6

Unused Unused

bit

operation

8 coding)

5

I

4

I

Logical Head

4 2

I I

(Bits 4

Write

7 is on.)

I

through

7

Unused

Operation Incomplete

Unused

I

7

1

6

2

7)

Note:

When

the

CE

cylinder

are zeros.

Figure 17. Sense Bytes 0

1024

(in all models) is addressed, byte 6,

through 7 Summary

bit

0 = 1 and all other cylinder bits in bytes 5

and

6

32

IBM

3350

Reference

Manual

3350 SENSE BYTES

SENSE BYTE 0

Bit 0 Command Reject

Bit 1 Intervention Required 3.

Bit 2 Bus

Out

Parity Bit

3

Equipment

Check

Bit 4 Data Check

Bit

5

Overrun channel.

1. Invalid

2.

Invalid

3. Invalid

4. Track

5.

6.

7.

formatted

Write

portion

Write

command

also set.

Format

1. Drive addressed

Drive addressed

2.

Diagnostic Addressed

4. The storage

command

An unusual in bytes 7

1. A correctable data error

correction An uncorrectable data error

2. byte

7.)

1.

Storage

2.

Data

byte

or

uninstalled feature

command

or

incomplete

write

control

reject).

hardware

through

data in

control

was

sequence.

without

of

file

received

attempted

not not

Write

or

device in

has

23.)

bytes

received

argument

mask

physically ready (HOA

Load

CE

detected a parity

condition

command

home

violated.

for

device

on

defective

command

mode

and

in

detected

15

through

detected

the

byte

too

late

issued.

transferred

address.

with

track.

attached

not

powered-up).

issued and

not

available error in

the

channel,

in

information

22.) in

information

from

the

from

the

by a control

Write

to

system.

the

storage

drive

channel

command.

Protect

microdiagnostic

for

received

switch

use.

data

transferred

control,

from

a drive. (Condition

before

the

last

during a write

or

on. Byte

is

resident

from

(Condition

drive.

a drive.

byte

read

operation.

1,

bit 6 (write

in

control

the

channel (not a

2,

(Byte

further

was

accepted by

further

bit

1 on, and

inhibited)

storage.

defined

in

the

The

storage control posts overrun only

CCW Data of

the record is padded with zeros. All data overruns are

overruns occurring on second

operations.

If

the overrun exists

Bit

6,7 Unused --set

Figure

18.

Sense

Byte 0

Description

if

one

of

the above conditions occurs more than ten times in

chain, in the second

transmission is stopped when overrun is detected.

to

0.

after

or

later segment

or

higher record segments and overruns occurring during format

com171and

retry

of

overflow record,

is exhausted,

or

If a write

retried

byte

1,

during a

was

by

bit

0 (permanent

format

write

in progress, the remaining

the storage control except

error)

operation.

part

for

write

is posted.

Sense

Data

33

3350

SENSE

Bit

0 Permanent Error

Bit

1 1. Invalid

Track

Format Bit

2 1. A End

of

Cylinder

Bit

3 Bit

4 No

Record area

Found Bit

5 File File Protected

Bit

6

Write

Inhibited Bit

7 One

Operation

Incomplete

BYTES

Storage

2.

Unused --set

1.

2.

1.

2.

3. An

also set.

1.

2.

3.

4.

5.

6. Seek

control

An

attempt

Index

was

(programming

multitrack

An

overflow

incomplete,

Two

index

or

without a write,

Access

Seek Multitrack

Overflow

Overflow Overflow Correctable 0,

Defective Uncorrectable

position

mask

violated

command.

attempt

of

made

the

following

bit

4, data check, also set.)

error

retry

was

made

detected

error).

read

or

operation

also set.)

to

0.

points

sensed in

verified

by:

read

or

operation.

to

write

to a file

beyond

or

found

occurred protected cylinder

data error

alternate

data

in

count

to

in

gap

search

attempted

search

(Byte 1,

on

found

track error second

SENSE BYTE 1

exhausted

write

data

following

attempted

to

command

sense,

or

control

before

the

command.

bit

7 also on.)

drive

with

when

overflow

boundary.

in

data

found

after

found

in any area -

or

later

and

not

exceeding

count

or

to

go.

go

past

chain

command.

bit

is

posted

Read

Only

record

(Byte 1,

area -

not

start

segment.

successful.

the

track

key area

beyond

the

with

of

not

the

cylinder

no

intervening

(programming

switch

was

bit

5,

file

bit

2,

end-of-cylinder,

last

segment.

data

transfer.

first

segment.

capacity.

during

read

or

search

cylinder

boundary. (Byte 1,

set

processed:

protected,

on.

(Byte

boundary.

read in

error).

Byte

0,

also set.)

2,

operation

bit

home

address

bit

0,

command

bit

1,

correctable, and

7,

operation

or

data

reject,

byte

See sense

Figure 19. Sense Byte 1

Description

34 IBM 3350 Reference Manual

byte 3 for

restart

command,

and

bytes 8 through

13

for

restart

information.

3350

SENSE

BYTES

Bit

0

Bit

1

Correctable

Bit

2

Bit

3

Environmental Data Present

Bit 4

Bits

5-7

Bits

0-7

Restart Command

0-7

Bits Physical Drive

Identification

SENSE

--

set

to

Unused Indicates

pattern and restart displacement. Alternate

Indicates

If

1,

Unused

This byte identifies

Bit

that

controller that

drive is operating in a

--

When

0 = drive 0,

0.

data error posted in byte 0,

selected.

bytes 8

through

23

3330

set

to

0.

SENSE

byte

1,

bit

the

bit

1 = drive

7 is set,

this

0000

0110

SENSE

physical drive selected.

1,

BYTE

2

bit

4 is correctable. Bytes

contain either usage, error statistics,

compatibility

BYTE

byte

= Read

(Zero

BYTE

and so on. The

mode.

3

shows

If

0, drive is operating in native mode.

the operation in process

0000

when

byte

1,

bit

4

bit

number

7 is

is equal

0101 =

off.)

15

Write

to

through

or

at

the

22

identify

error

log information.

the

time

of

interrupt:

drive number.

error

Bits

0-7

Low

Order Logical

Cylinder Address

Figure

20. Sense Bytes 2

Bit

Cylinder

through S Descriptions

SENSE

Identifies

low-order

0 1 2

128

64

BYTE

eight

32

5

bits

of

the

current seek argument.

3

16

4 8

5 4

6 7 2 1

Sense

Data

35

Page

of

Revised

By

TNL:

GA26-1638-I

Jan.

31, 1978

GN26-0342

SENSE BYTE 6

This byte identifies the logical track address and cylinder used in the current Seek.

high-order

*When

can address any valid head.

address

Bit

No. 3350 Native

bit;

bits 3 through

0

1

2 3

4

5

6 7

CE

cylinder 1024 is addressed,

7 indicate the logical track.

or

3330-11

CE Cylinder Cylinder 256

bit

0=

Compatibility

Cylinder*

512

1 and all

other

cylinder

Mode

Logical Head

Logical Head 8 Logical Head 4 Logical Head 2 Logical Head 1

bits

of

16

bytes 5 and 6 = 0.

SENSE BYTE 7

Bits

0-3

Format Type

Bits

4-7 Message· Code

Specifies

0000 0001 0010 0011 0100 0101 0110

Also

* displacement

Message code indicating

format

may be presented on errors

of

sense bytes 8

(Format (Format (Format (Format 3) Storage control checks. (Format 4) (Format (Format

0)

1)

2)

5)

6)

information.

through

Programming I system checks. Device checks. Storage

ECC

uncorrectable data checks.

ECC

correctable data checks*.

Usage I error statistics.

which

type

of

error; defined on Format Message page. (See Figure 22.)

23 as

control

are

follows:

equipment

not

ECC

checks.

correctable

0

Bits

3330-1

through

Compatibility

CE

Cylinder*

Cylinder

Cylinder 0

Bits 3

but

which

2 indicate the

Mode

256

through 7 of

require restart

byte

6

1

Figure 21. 3350 Sense Bytes 6

36 IBM

3350

Reference Manual

and

7 Descriptions

3350 FORMAT MESSAGES (Sense Byte 7)

P1;tge

of

GA26-1638-I

Jan.

Revised By

TNL: GN26-0342

31, 1978

Message

Number

i---

FORMAT

No

0

1

2.

3

4

5

6

7

8

9

A

B

c

D

E

F

message

Transmit target

error data check

Microprogram

detected Transmit

difference high error

Sync

out

timing

error

Unexpected drive

status

at

initial selection Transmit

, cylinder error in key area

(string

switch

Transmit error in data area

Transmit difference

Unexpected file

status during

Read IPL

Seek error

Retry seek

plete

or compare equipment

No

interrupt

from

drive

Defect re-orientation check

Device undetermined at initial selection

Retry orientation check

skipping

type

1

errors

only)

head

error

or

retry on retry

incom-

sector

non-

(with

check)

* Also may be presented on errors

require restart displacement

information.

FORMAT4

HA

area Unused

data check

Count area Unused

Key area data check

ECC

uncorrectable

data checks data

No

sync

byte

in

HA

area

No

sync byte

in

count

area

No

sync

byte

No

sync

byte

Unused

No

address

mark

detection

which

are

not

ECC

FORMATS

Unused

ECC

correctable

checks*

correctable

but

which

Figure 22.

Format

Messages

Error Recovery 3 7

FORMAT 1 SENSE

~~-e-8-----.--C-o-n-tr_o_ll_er-~D-ev_i_c_e--~D-r-iv-e-------.~R_e_a_d

Drive Check Status

Byte

9 Pad In Checks Progress Status

1----------1------1------+--------<-----+-----+------<--~

Byte

10

HOA

Sequence

,_C_o_n_t_ro_l

i

Byte

Load Status

Byte

Read Safety

Byte

I

Control

rB_u_s_O_u_t

____

11

Switch

12

/Write

13*

Interface

____

BYTE

L

BitO

Mode

I Check

-+-

____

Drive Start Switch

Multiple Chip Enable Overrun Check Select

Check . i Read Chk

_,_

_____

SUMMARY

1

Interface

Check Check ! j

Sector Compare

Check Latched Installed I

Size

HDA HDA HDA HDA

Sequence Sequence Sequence

,_L_a_tc_h_4

__

Guardband

Pattern ,

Capable/ Check Check

Control

(for

message

~------~------~------1_,3_,_5_,_6_,

(3350 Equipment Checks)

2 3

__

____,_O_n_li_n_e

Check

Motor

Speed Latched Enable I

_,__La_t_c_h_2_---+_L_at_c_h_1

I

Target

Velocity

Write

Interface

Bus

code

At

C).

Out

Write

Air

Switch

___

Track Crossing

Index

Write

Timer

.,_C_h_k_L_a_tc

Unused

Delta Current

-~

4

__

.-H_D_A

Attention

5 i s

lsusy

!

~------i

I Fixed Head I

HDA

1

HDA

Sequence

__

h_+-1 C_h_k_L_a_t_ch._j__ i

Air Switch

lcontrolj

1

Check

1

Expected Drive

Data valid

Spindle

1

Mode Bit

I

Unused

I Phvsical

I

Unused : Motor

[ 1

1

write

Transition

1

'I

Check i During

Status

for

message

7,

8,

and9.

2

codes

\seekCmpl

1

I

'Mode

J_Speed

!Write 'Current

7

or

Search

Sector

Pad

S:inpl

Spindle Bit

Odd

Tr~ck

----i

1 !

At I

or

J

I

I'

j

I

1'

I

i B

~

A

~b~~r~~l*nterface

Bus In (Valid

f---~------1-~--~------~-----------~--~~-~-~-~~--~-~------j

Byte15* Control

Interface

Control

(Valid

Interface

only

for

Interface

only

for

Bus In (at

message

Tag Bus (at

message

codes

time

1,

time

1, 3,

error

3,

5,

error

5,

was

detected).

6,

7,

8,

9, and C.) I

was

detected). I

6,

7,

8,

9, and C.)

_J

i B

I

:

1

lI_~_u_s~~-~+-----~~~~--~---~---~-~~~~-~---~--~-~-~~-~

I

Byte

16

Access Status

Byte

17 Controller Checks Error,

Byte

18 I

Microprogram Detected

Byte Status

Errors

19

1--~-~~-~--+c(_s_ee_B~y_te_B~l,__

Byte

20

Interface

Checks Tag Bus Bus

1------~---1-P_a_r_it~tv_C_h_k_rP_a_r_it_,__vC_h_k--<1-------+-C_h_e_c_k~~-+-P_a_rit~y_C_hk_+--~~--t---~~~-+-~~---;

Byte

21

Device Interface

Bytes

* These

22

bytes

Check

and

Access Time

Out

Check Check Latch Latch 1 VFO VFO SERDES Gap

Detected

Unused

Set R /W On

Control Control Interface Interface

Unused

Overshoot Check

Detected

2-bit

Error,

Unused Unused Unused

Reserved Reserved Reserved Head Pad Gate i

___

Out

Unused

Servo Off

Track

Check

1-bit

__,~~~~-+---~~C~he_c_k

Drive Device Selection Check Parity Bus In Failure Check

Unused Unused

Rezero Servo Linear I

Mode

Counter Check Check Check I

Bus In

Latch

Write Data

Coded

Short

__

._,_~~-~~L___~---~nl___~--j

Control Interface

Unused Unused

Mode

Monitor

II

Check

Error

Condition

Control

Latch I Latch

ECC

II

Hardware

3350

Check I Drive 1

j

Write

II

Current

3330

Index

, Device Bus I Device Tag I

I

Out

I Check I Check I

23

are also valid

for

message

code 2 when

byte

Fault

18

equals 1,

Symptom

3,

Code

5,

6,

or

E.

I.

Wait

~I

lEcc

! Zeros '

Detected

i r

(bits 4

through

Mode i Re-orient

Parity I Parity C

7)

1

·1

(Always

'

1

Counter

1

I,

Check I

1

I

1

D

11

I

I C

Note:

Figure

A,

23.

38 IBM

B, C,

and D

Format I Summary

3350

Reference

refer

to

bytes

Manual

on the following page.

A

If

busy

If

set read

(bit

6 on), Search

/write

is on (byte 19,

Sector

is in progress.

bit

0 = 1), byte 8 is read

as

follows:

0

Controller Checks Sense

B

With

message code A

1 2 3

Write

0

Previous Seek

128

High Physical Cylinder

dr

SS

512

C

If

equipment

indicate:

check is on (byte 0,

0

128

High Physical Cylinder

dr

SS

512 256

Current

or

Address

64

Ad-

256

64

Ad-

4 5

Drive Check

B (byte 18,

Read/Write

Check

bits 4 through

7), bytes 13 and

On Line

14

2 3 4 5

(access

bit

2 3

Present Seek

32

3)

32

position

and

with

Address

before

present seek,

16

message

code

8

Physical Head

8

A indicated in

4

(low

physical

16 I 8 4

Physical Head

16

8 4 2

indicate:

bytes

cylinder

Padin Progress

5 and 6)

Low

Physical Cylinder.

4

Address

4

byte

7,

bits 4

through

5 6

address)

Address

6

Index

6

Mark

2

7,

bytes

2

7

3330

Modes

7

20

and

7

21

D

Microprogram

Unused 8

0

1

No No

2

operations. No response

3

Time

4

ECC

5

6

Multiple Preselection check. F Unresetable interrupt.

7

error messages (sense

tag

valid on

normal

out

hardware

read/write

or

check end on

from

waiting

or

for

check. D Unused

no

controller

byte

18, bits 4

operation. 9

read/write

drive on

control

index.

selected. E

or

ECC

operation. B Busy missing

through

7)

A

c

Repetitive Repetitive

Incorrect

Unused

Always

active

command command

drive selected.

after

overruns on G 1 operations. overruns.

seek

bit

on

bus

start

in.

was

issued.

Sense Data 39

FORMAT 4 SENSE

BYTE

SUMMARY

(ECC Uncorrectable

Data

Checks)

Byte

Cylinder Address

Byte

Cylinder Address

Byte

Head Address

Byte

Head Address

Byte

Record Number

Byte

Sector Number

Byte

8

9

10

11

12

13

22

23

BitO

1

High-order

Low-order

High-order

Low-order

Record

number

2 3

cylinder

head

of

Zero

Sector

number

byte

of

byte

of

byte

of

byte

of

the

record in last

if

error

occurred

of

Fault

4

the

last

count

area read. (See Note.)

the

last

count

area read. (See Note.)

the

last

count

area read. (See Note.)

the

last

count

area read. (See Note.)

count

area read. (See Note.)

in

home

address.

the

record in error. (See Note.)

symptom

code.

5 6 1

Note:

The

occurred in count area),

Figure 24.

information

Format 4 Summary

in

these

or

bytes

9

(AM

is unreliable

detection failure on

if

the message code

retry).

in

byte

7 is 0

or 4 (error

occurred

in

HA), 1

or 5 (error

40

IBM

3350 Reference Manual

Page

of

Revised Jan. 31, 1978

By

GA26-1638-J

TNL: GN26-0342

FORMAT 5 SENSE

Byte

8

Cylinder Address

Byte

9

Cylinder Address

Byte

10

Head Address

Byte

11

Head Address

Byte

12

Record Number

Byte

13

Sector Sector Number

Byte

14

Unused

Byte

15

Restart

Byte

16

Displacement

Byte

17

Byte

18

Error

Byte

19

Displace-

ment.

Byte

20

Error

Byte

21

Pattern

Byte

22

BYTE SUMMARY

BitO

Error

displacement

Error pattern used

1 2 3

High-order

Low-order

Record

High-order

Low-order

location

(ECC

Correctable Data Checks*)

cylinder

cylinder byte

head byte

number

Specifies the

storage control

of

first

for

byte

head byte

of

the

number

byte

error

correction

of

the

last

of

the

last

of

the

last

of

the

last

record in last

of

the record in error.

Unused.

number

to

in error

of

bytes processed

the end

within

function.

4 5

count

area read. (See Note.)

count

area read. (See Note.)

count

area read. (See Note.)

count

area read. (See Note.)

count

area read. (See Note.)

by

the

of

the area in question.

the data area measured

(See Error Correction Function.)

from

the

end

of

7

area.

Byte

23

Unused

Note:

The

(error

information in bytes 8 through 12 is unreliable

occurred in count area).

* Also may be presented on errors which are not

Figure 25.

Format 5 Summary

ECC

Unused.

if

the message code in byte 7

correctable

but

which require displacement information.

is

0 or 4

(error

occurred in HA)

Error Recovery

or

1

41

FORMAT 6 SENSE BYTE SUMMARY (Usage and Error Statistics)

Byte

Byte Byte Byte Byte

8-11

Bytes Read or Searched

12-13

Unused

14-15

Retry

Data

Errors

16-

17

Number of Seeks

18

19

Seek Errors

20 21 22 23

'\,

BitO

These

control

These

1

four

bytes provide an accumulated

in read

or

search operations. Bytes processed during retry

two

bytes contain the

two

bytes provide

Bit 0 set

to

count. Only

zero = bytes

one = bytes

Total

number

(Seek errors

2

key

number

the

number

20

of

Command

Data overruns, channel A

eommand

Data overruns, channel B

3

count

and data area

Unused.

of

initial

ECC

control.

of

seek

through

seek errors retried

23 contain

found

on retry are

overruns, channel A

overruns, channel B

4

of

the

number

counts

uncorrectable data errors retried

commands

are accumulated.

information

by

the storage control.

not

or

5

of

bytes processed by

operations

processed by the storage control.

for

included.)

or

C. C. or

D. D.

are

interfaces A and

interfaces C and

6

not

included in

by

7

the

storage

the storage

B.

D.

this

Figure 26.

Format 6 Summary

42 IBM

3350

Reference Manual

Operator Controls and Indicators

OPERATOR

Each

3350 drive. The indicators and controls for each panel are shown in Figure 27.

EJ

START STOP

Figure 27. 3350

PANEL

unit has two

ATIENTION

~

Operator

operator

Panel

panels,

one

R/W

READ

Ready Lamp

The Ready lamp turns

disk drive speed track.

on

when the drive

is

up to normal,

and

is

the head

for each

operator

(.:;)

~

on, the

is

on

Attention

When pressed, the Attention pushbutton starts a rezero operation. Rezero moves the heads to cylinder zero, resets the address registers, and signals attention to the controller. end interrupts are generated for

Read,

When in the Read position, no write can be performed. writing operations are possible. is

changed during an operation, the condition does not

change until the operation is completed.

Start/Stop

The drive drive. When set disks rotate up to speed, and the heads move to cylinder zero. When set to Stop, the heads retract, the

a

brake engages, interlock in the Stop position prevents a stop drive

Pushbutton

R/W

Start/Stop

is

busy.

On

Switch

If

Switch

to

Start, the brake

and

the disks stop.

a drive

set to

toggle switch starts and stops a

in

3330-1 mode, device

both

logical devices.

or

erase operation

R/W,

all reading

If

the switch position

is

released, the

An

electrical

and

if

the

Operator

Controls and Indicators 43

POWER

CONTROL

PANEL

(A2/

A2F)

A and B Enable/Disable Switches

A power control panel of each A2 or

Figure 28.

A2F

Enable Enable

A~

Disable Disable

Figure 28. 3350

Power

Pressing the Power

applied to the string if the Power switch

Enable position.

On

A2/

Switch

is

mounted

dual-drive unit and

B~

A2F

Power

On

switch allows ac power to be

on

the front cover

[E]

Enable

Power

Off

Control

Panel

is

shown in

is

in the

These switches are used to select the active interface in

3350

systems that have the optional string switch

feature.

CONTROLLER

ASSIGNMENT

PANEL

(C2/C2F)

A controller assignment panel or

C2F

unit and

is

shown in Figure 29.

is

mounted on each

C2

Primary I Alternate Switch

This two-position toggle switch controller Primary, the A2 When set to Alternate the controller. String power must be off before this switch is changed. During a power up sequence, the online controller Primary

is

online, primary

or

A2F

unit

is

determined by the position of the

I Alternate switch.

Primary I Alternate Indicators (C2

One of these indicators primary

or

alternate controller

is

used to select which

or

alternate. When set to

is

the online controller.

C2

or

C2F

unit

is

the online

or

C2F Units)

on to indicate whether the

is

online.

Power Switch

ENABLE

With the switch in the Enable position, the string may

be powered up by pressing the Power

a system-controlled power up sequence.

OFF

When the switch

powered down and string power cannot be restored

until the switch

Power

The Power

applied to the drive as controlled by the Power

On/Off

On

switch and the subsystem sequencing.

is

set to Off, the entire string

is

set to Enable.

Indicator

On

indicator is on when ac power is

On

switch

is

or

by

A

Enable tt

~isable~

Primary

©

Figure 29. 3350

B

Enable i

gisable~

Alternate

~

C2/C2F

0

Controller

Assignment Panel

44 IBM

3350

Reference Manual

Index

A

AC

power

Access

drive fixed

head

selection maximum mechanism minimum time

Addressing

drive drive

variations

address

number number

types logical physical storage string

Alternate

Area

count data key 6

Attaching

!SC

I

system/370 3830-2 I

Attention

44

rotation

models

17

2

17

I

15

ranges of

addresses

of

strings

of

strings

drive

selection

drive control 15

Controller

6

3350

models

pushbutton

17

time

15

IS

17

16

43

17

16

15

16

Commands,

control

read

25 search sense write

Compatibility

with existing 3330 Model I 3 3330 Model

Control

code diagnostic diagnostic

function

no

recalibrate restore seek 26 seek seek set file set space

Controller

assignment function primary/alternate

Controller Correctable Cost Count Cylinder

25

commands

26

operation

26

cylinder

head

mask

sector

count

assignment

per

byte 1

area

address

channel

25

mode

storage

11

load write

26

panel

2

data

checks

6

26

3

26

17

26

44

switch

panel

3

44 44

41

B

Brake,

drive

Bus

out Byte 6 Bytes (see

parity

c

Capacity,

DL

bytes tables with keys

per per

without

per per

Capacity,

formulas native number

compatibility

3330

CCW

restart restart restart

Channel Command Command

43

20

sense

bytes)

record

11

cylinder track

12,

keys

cylinder

track

11

track

10

mode

10

of

records

construction CCW 1 19 CCW 2 19

commands

reject

set

I

12, 13,

13,

11

(see

20

33

14

I 0 10

commands)

25

D

Data

formats groups integrity record

count data file key seek

write security sense track

format data home track

Data

area

Data

base/data

Data

check

Data

rate

Data

records

Data

transfer

Defects

skippable track

Device

release

Device

reserve Diagnostic Diagnostic Direct

access

6

18

format

area

6

protection

area

6

verification

protect

18

31

records

address

descriptor

6

communications

20

I

6

rate

6

29

evaluation

sense

29

storage

6

18

6

17

18

6

record

2

6

Index 45

Disable switch 44 Drive

addresses

modes rotation

selection

Drives

function 2

modes

operator

power

Dual-drive

15

17

15

panel

control

storage

E

Enable

switch 44

End

of cylinder 20 Environmental Equipment Equipment Erase 30 Error

correction error general description 20

Error

correction

correction recovery

CCW restart storage

system-invoked

data check 20 checks 38

function

correction

function

table

action

restart

CCW

control

F

File

protected

File

protection

Fixed

Format

head

20

18

1

messages

G

Glap

6

II

liead/Disk

Head

Home

I

Index Indicators

alternate power primary

ready Input/ Integrated Intervention Invalid

Assembly

selection time

address 6

point

6

44

lamp

output

track

43

operations

Stornge

required 20

format

43

44

4

present

(ECF)

table

19

construction required

19

37

(HOA)

17

15

Control

(!SC) 3

20

19

K

Key

area

6

L

Latency, drive

M

Macro

orders

Models

alternate controller dual-drive storage 4 fixed system/370 3330-1 1 3330-11 1 3350 4 3350 A2, A2F 1 3350 B2, B2F 1 3350 C2, C2F 1

controller

head

2

1,

4

1,

4

1

4

N

Native

mode

19

description 3 3350 3

No

record

found

20

0

Operation Operator

Overflow records 6

Overrun

p

Panel

Permam:nt

5

Physical address Power

Power Primary Privacy 1

R

Read

Read Read key Read multiple Read Read

incomplete

panel

20

controller operator power

control

on

indicator

on/

off

switch 44

control

controller

commands and

reset count count, data home initial

and

record zero sector

controls

assignment 44

43

44

error

20

(PA) 44

panel 44

adapter

28

buffered

28

key,

and

data

count,

(RO)

data

load

28

key,

28

address 28

program

28

20

43

17

log 29

28

and

28

4

data

28

46 IBM 3350 Reference Manual

Read

only

Ready

lamp

Record

rorrnat count data key

area

Recovery

action

explanation Remote Rotational

switch

area

action

21

switch

position

43

6

table

21

attachment

sensing

Storage String

Switch

4

1

System/3 Systems

subsystem

switch

feature

alternate disable enable enable/disable primary

remote

4

44

4

70

models

residence

4

l

I

s

Search

commands

Searcli

home Search Search Search Search Search Search Security Seek

address

Seek

verification Sense Sense

byte byte I 34 byte byte byte byte byte

byte Sense Sense

condition

format

formats

sense

status Sense Sense Servo Special

primary

remote

string

Start/stop

Storage

fixed

address

ID

equal

ID

equal ID key key key

byte 0 through 7 summary bytes,

0 33

2 35 3 35

4

or

high

27 equal equal

high

I

17

descriptions

35

5 35

6 36

7 36 commands Data

1/0

surface

compatibility native

messages

31

byte

31

29

type

features

controller

switch

capacity

head

mode

31

summary

29

1

27

or

27

4

27

high

27

high

18

29

4

43

mode 4

equal

27

37

31

adapter

1

27

T

27

Test Track Track Track Track

track

1/0

29 address capacity descriptor format

descriptor

17

(see

6

capacity)

record

10

6

u

32

Unconditional Uncorrectable Usage

and

error

reserve

data

checks

statistcs

29

40

42

w

Write

commands

Write

count,

Write

data

Write

home

Write

inhibit

Write

key

Write

Write \Vritc Write Write

and padding protect record release

special

Numeric

4

3330-1 3330-11 3350

A2,

3350

82,

3350

C2, 3830-2 3850

attachment

A2F B2F C2F

I

key,

and 30 addr(;ss

20 data

7

18

zero

7

count,

I

30

(HAl

(RO)

key,

3

30

data

30

and

30

data

30

Index 47

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World Trade Europe/Middle East/Africa Corporation

Hamilton Avenue, White Plains, N.Y ., U.S.A. 10501

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Specifications and Main Features

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