IBM 3340, 3344 Reference Manual

GA26-1619-4

File No. 5370-07

Reference

Manual for

Systems

IBM

3340/3344

Disk Storage

IEnfi

PREFACE,

This

publicatic,n

is

intended

to

familiarize rCata

proc-

essing

personnel

lvith

the characteristics

ol' IBM

3340/3344 Disk

Storage. The

reader

should

have

prior

knowledge

of direct-access

storage

dievices

and

concepts.
This

publication

is organized

by topics

as follows:

r

INTRODTiCTION

-

Describes

basic unirs

and

lists

highlights

and f'unctions.

o

CONFIGTJRATIONS

and ATTACHVIENTS

-

Defines sorne

possi'trle

combinations

and svstem

attachments for

the 3340i3344.

o

FEAT'URF,S

-

Describes

both

standand

and

optional fe:rtures

available for

the 334(l/3344

with

illustrations

of some

combinations.

o

FORMATS

-

Describes

and illustrates

thc record

and track Irtrnrats

for

data. Also

provided

are

Record,i T'rack

capacity

charts including

formulas

for

capacitll

calculations

of

various

length

records.

o

INPUT/OLTTPUT

-

Includes

addressing

methods.

access tintes.

and identifies

security

and

privacy

me:ans.

Lists and

summarizes

the

3340/3341

command set

and sense

byte

formats.

Also includes

an

error condition

table and the

associated

{lrror

recovery

actions.

o

OPERAI lNG

INSTRUCTIONS

-

Describes

all

switches anrd

indicators

associated with

tht:

Fifth

Edition

(July

1975)

'Ihis

pubf

ication

rcplaces

arrd nrakcs

Re.l'erence

Manuul

{r:r

lBll[

-t -]40 Disi

Storase,

Ordcr

\,r.

GA26-1619-1.

obsolctc.

Significant

chattg,:s trr

addilions

to thc specifications

containcd in

this

nubliearrgn

are continually hc-ing

ntade . Bcforc

usttrg

ihis

grubliczrtion

irr

corrnection

with the

operation

of IBM

equiprnent,

c()ntact the

loc:rl IBM

Branch

()flice

f or rcvisions.

copies

of this arrd

other [81\1

publications

can

be obtained

thr<iush

ll]ful llranclr

C)ffices.
.A form for

readcr's

rommcllts

is

provi<1ed

at

thc back of

lliis

nublicalion,

lf thr:

fornr has

been re ntovcd.

send

vour

c()ntinent:,

to the adclress

h,:low.

'fhis

nranual

was

prepared

by thc IBM

Gc'cral

Pr'duc1s

[)ivision.

Craphics

and

Publishing.

Departmcnt

G26. San

.,Iose. Claiifornia 95

193.

!:'

Copyright lnternational

Ilusincss

Machines

Corporation

lg7

j.

1974, 1975.

3340/3344

Operator and Power

Panels. Provides

suggested

instructions for

data module

unloading

and loading

procedures

and

the EnableT'Disable

Read

Only

Function.

The

following

publications

are recommended

for

detailed information

concerning the

subjects covered

in

this manual:

c

IBM

System/370 Principles of

Operatlon,

Order

No.

GA22-7000.

c

IBM 3348 Data

Module Handling Procedures,

Order No.

GA26-1625.

o

IBM

,1

340 Disk

Storage Fixed Head

Feature

Users

Guide. Order No. GA26-1632.

c

IBM Reference

Manual

for

Integrated

Storage

Contol.

Order No.

GA26-1620.

o

IBM Reference

Manual

.f-or

3830 Model

2

Storage Control,

Order

No.

GA26-1617.

o

The Data Processing

Glossary,

Order

No.

GC20-

|

699, define s terms related

to direct-access

storage

devices.

o

Thc functional

characteristics manual

applicable to

thc

parent

system.

C)rcler

numbers for functional

characteristics manuals

can be found in the IBM

.S.y.stem/

360 and

System/ 370

Bihliography,

Order

No.

GA22-6822.

ii

IBM

334014'1

Re

ferencc

Manual

Introduction
IBM

3:140

Disk

Storage

DataModule....

Defect

Skipping

IBM 3344-82ll]2F Disk

Storage

. . .

.

IBM

3340/3344 Units

3340/3344

Storage Clontrol and

Features

Storage Control

Devices

Special

Features

StringSwitch....

Rotational Position

Sensing

Fixed Heirds

Configurrations....

3340

Stc,rage

Without

3344 .

Modeli I l5

(115

DDA)

Modet

1'25

(125

DDA)

ModeL

13-5

(IFA)

Moclels

135. 145. 155-ll, 158, 165-ll,

ancl

l68

(3830-2)

Models 145, l5B.

ancl

168

(lSC)

3340/3344 Configurations

. . .

Model l.15

(IFA)

Models

135,

145, 155-tl. 158, 165-ll.

anrl

168

(3830-2)

Models 145, 158,

and

168

(lSC)

IBM 33418 Data

Module . . . .

Data Mc,dule

Types

Data Mo'duh

Initialization . .

.

Data

Surfacc

Format

Formats

Record Format

Count

Area
Key Area
Data

Area

TrackFormat....

Home Acldress
Track

Descriptor Record

(R0)

DalaRecords....

'frack

Capacity

Input/Output Operations

Device Selection

and

Addressing . . .
Device Address
SeekAdclress

...

Access

and Data

T'ransfer Speed

.

Pagc

ol

(iA26-1619-,1

Rcviscd

May 16.

lt)76

By'l

NL:

(;N26-012ti

CONTENTS

Access

Motion Time .

Head Selection

Time

Rotational Delay

.

Data

'l'ransfer

l1

Data Security and Privacy

. . 11

Read Only

Function

11

FileProtection...

11

Seek

Verification .

11

ErrorRecoveryProcedure..".

18

Error

Correction

Function . .

.

18

Error Condition

Table

ltJ

Error

Recovery Action

l8

Constructionof

RestartCCWs

.......

l8

Channel Commands
Sense Commancls

.

Control Commands

Rcad

Commands

.

Write Commands

.

Search

Commands

Sense

Data

Sense

Byte

Suntmary

ScnseBytesO-7Suntmary...,

-15

3340 Sense

Byte Format I Summary

l(r

3344

Sense Byte

Fornrat I

Summary

-lti

Formats

l,

4,

and 5

Message Summary

40

Sense

Byte Format 4 Summary

1l

Sense

Byte Format 5 Summary

4)

Sense

Byte

Format 6 Summary

'+-3

Operating

Instructions

3340 Operator

Panel

3344

Operator

Panel

3340/3344

Power Panel

.

Machines

Without String

Switch

Feature

Machines

With Strins

Switch

Feature

Data

Module Loading

Data Module Unloading

4()

Read Only

Function

'+7

Enable

Read Only F-unction

1'1

Disable

Read Only

Function

1l

Index.

48

t6

l6

t1

3
3
3

3
3

3

4
4

A

4
4

l.)
i-)

_-)

J)

-:)

i)
l4

j'1

4

.4

4

,+4
44

14

4l
4-\

46

6

6

6

6

8
8

6

d

8

8

d

8
8

9

lo

l6
l6

IO

16

Conte

nts

iti

['a-ec

t'l

C,'\]ri-

l(r

l9-.1

Rt'viscd

\1ay

2(r.

l9

/(,

tsy'l

Nt-:

(;\16-().1:tt

FIGURES

Figure l.

Figure

2.

Figure

3.
Figurc 4.
Figure

5.

l'igure

b.

Figure

7.

Figurc

8.
Figurc

9.

Figure 10.
Irigure

I I .

Figure 12.

Ittlvl

3340/:1,144

Disk

Storaire . . .

IFA

3340/-i344

Maximunr

Cenl'isuralion

ISC or

3IJ30-2

Maximurn

Llonl"isuration

l)ata

Surface'l'rack

l-ay,out

. . .

. .

l)ata

Module

(ieonrctrv

l{ecord

and'l'rack

Formar

l'rack,/(lyiinclcr

C:.ipacitir:s

-

No

Kcls .

Darta

Module

Capacitics

-

Ntr

Keys . . .

.

-l-rack,/Cylincle
r

Capracrtrcs , Wirh

Kcys

Data fr4oduie

Capaciticr

,

V'1irh

KL:y's

Errclr

C<inclitiorr fehlc

Rccovery

Actiorr

'l

ablc .

lic:nse Lurnrnand\
(

lontrol

(.

onrnrirrrils

Rcaci

(-ornnrarrds

Writ.e

(.'ornmanLls

Search

(.'ornnrarrrls

Scrrsc

[3yt.es

(.]-

J Sumnrary . . . . . .

-J-1.10

l'orrlrat

i 5c;tsc

llttc

Suniltrarv . . . . . .

-l.l-1.1

l orrrurl

I

Scn:;c

Bytc

Sunrutary"

. - .

lrormats l. 4,

and 5 Messap'.q'

Surnirr.rrv

Fornt.rt

-l

Sulrrnrrry

I olmut

-5

Surt)nliir)

Frrfilli-rl 6 Sutilnlltrv

Opcrator Panc:i, ll-140 ancl

3j"l4

"

Powcr l)arrel,

334f) / 3341

ljata Module

[.oad,'Linlrred

llttrtl

()lriv

l,rr(

ll.tl

5
)

l(r

)l

-19

-)l

ll
,15
36

-18

10
4l
.1

,l

-tr.1
:i4

,16
,47

it

llJ\l .i.lJU,.++

Rclu,rr.tr.t' Iilrrru:rl

The IBM 3340

Disk

Storage

provides

direct-

access storage

for IBM

System/370

Models I

15, 125,

135, 145,

155-II,

158,

165-II,

and 168.

The 3340

consists

of a Model

42, control

with

dual-drive

disk

storage,

and up

to three

attached

dual

(B2)

or single

(Bl)

drive units.

The 3344large-capacity,

dual-drive

unit

can

be substituted

for

the 3340

B-type

units

on IBM System/370

Models

135,

145, 155-ll,

158.

165-II,

and 168.

The

3340/3344 is

a modular,

high-speed,

large-

capacity disk

storage

subsystem

for

data base,

data

communication,

or

general purpose

use.

IBM 3340 DISK

STORAGE

The IBM

3340 direct-access

storage

introduces

two

technological

advances:

a data module

and

defect

skipping.

Data

Module

The

sealed data module

cartridge

contains

storage

disks,

drive spindle, read

and write

heads,

and access

arms. The data module

has

several advantages

over a

disk

pack:

o

The drive

data storage

capacity

can be changed

by

using a different

data module.

o

The

heads, storage

disks,

and drive

spindle are

sealed inside

the data

module.

This avoids

contam-

ination from

outside

sources

and reduces

preven-

tive maintenance.

o

Reliability

is

improved

as

each head

reads

only the

data

that it

previously

wrote.

Defect

Skipping

Defect

skipping allows

data to

be stored both

ahead of

and following

a surface

defect. All

of the recording

track can

be used except

for minute

portions.

Since

the heads no longer

need be moved

to an alternate

track, access time

is saved.

Data module

capacity is not

changed

by defect

skip-

ping

and

t.he user is

rinaware of

defects.

INTRODUCTION

IBM 3344-B2IB2F DISK

STORAGE

The

IBM

3344-BZlB2F

dual-drive unit

provides

increased

capacity, lower-cost-per-byte,

direct

access

storage.

Each

3344

drive stores four

times the

quantity

of data of a 7O-megabyte

data

module

by

using fixed

media. The 3344 dual

drives

can

replace

the

3340

B-drives in a 3340

string on IBM System/

370 Models

135, 145, 155-II, 158, 165-II,

and

168.

The

3344-B2F

contains fixed

head

storage.

Defect skipping,

similiar to that

used

on the 3340,

is also

used

by the

3344-B2|B2F.

IBM

3340/3344

UNITS

^fhe

334O/3344

disk storage

is made

up of a

maximum

of four dual-drives.

The

input/output interface

is a
3340 Model A2 containing two independent drives
and

their control logic.

Up

to three additional

attached dual-drives

are controlled by the A2

unit.

The 3340 Model B

contains

either

one or two drive

mechanisms.

The Model 81 contains a single drive;

the Model

82 contains two drives. Each model

contains

all necessary electronic and

power

supply

circuits for internal use, but data control and

power

sequencing

comes from the

A2 unit.

The

3340 Models A2,B2, and

Bl

use the 3348 data

module

as a storage medium.

The

3344 dual-drive models use

fixed

media storage

instead

of a data module. The

following

characteris-

tics apply

to both storage device

types

except that the

3344

storage

capacity is279.5

million

bytes-per-drive

and start

time

is

not significant

because

the storage

is

not moved.
The 3340/3344

offers the

following:

o

Start

time

-

less

than

20 seconds

o Average

access

time

-

25 milliseconds

o

Average

rotational delay

-

10.12

milliseconds

o

Nominal

read/write rate - 885,000 bytes-per

second

r

Data

module capacity - 34,944,'768

or 69,889,536

bytes

Introduction

I

IBM

3340-A2

(Control

and Two

Drives)

CONTROL
.

Interprets

and

executes

macro-orders

from the

storage control

r

Regulates the

storage control and

disk

$torage

interfaces

o

Serializes and deserializes

data

r

Checks data integrity

by error detection

and

error

correction analysis

o

Furnishes

status

to the

system

o

Performs

diagnostic evaluation

of the

3:140/3344

storage stnng

DRIVES

o

Responds to

commands from the

3340-42

(controller)

o

Houses, loads, filters,

and drives

a 334t| data module

which has various

capacities

(Models

31i, 70, and

70F)

r

Positions

access mechanism

with voice-coil

and

maintains track following

with

electronir: servo

system
Selects

the head

Reads

or

writes

data

Provides

safety

and

servicing

information

for

subsys-

tem

and system evaluation

Figure l. IBM

3-140/3344

Disk Storagc

IBM

3340-8l

(One

Drive), IBM

3340-82

(Two

Drives),

and IBM 3344

(Two

Drives)

r

Responds

to

commands

from

the 3340-42

(controller)

r

Positions access mechanism with

voice-coil and

maintains track following with

electronic servo

system

r

Selects

head

r

Reads

and

writes

data

r

Provides safety and

servicing

information for

subsys-

tem

and system evaluation

3340-81 and 3340-82: Houses, loads, filters, and

drives

the

3348 data

module(s)

of

various

storage

capacities

(Models

35,

70, and 7OF).

3344-82 and 3344-B2F:

Houses, filters,

and

powers

two fixed media

drives.

Each 3344

drive

is

equivalent

in

capacity and

format

to four

logical

3348 Model 70

volumes, a total

of

279.5

million bvtes of data.

a
a
a

2

IBM

3340144 Reference Manual

STORAGT]

CONTROL

DEVICES

'[he

followirlg

storage

control

clevices ciln accommo-

datc 31140

133,14

clisk

storiiP.o.

o

3lt30

Storagc Control

lvlodel 2.

o

Systcnr,l-170

Moclcls

l5lt and

l(rl{ llltc:p'1a1sd

Storage

(

lontrol ( ISC--).

r

Syr;tcm7/-170

Modcl

145

lSCl.

o

Sy:;tem,/370

Model

145 Storagc Cttntrol

Fr:ttnc

3345

Models 3,

4,

and 5.

o

Systcm,/370

Model

135 lntcgratc:cl Filc

Attlrch-

rnent

(lFiA).

SPECIAL

}'EATI-]RES

I'he 3-14(J

drsk

storage has

four special

lcaturers

'Ihe

Model A2 can

he'

supplied

rvith

the strirrg

switch and

thc

rcmotc l;witch.

All 3340

ntodels cau bc ordered

with Rotational

Positicln Sensing

and

Fixecl

I lcad

Storage.

Thc

3344

tiisk stclrage

has

no spccial

leatures.

iis

Rotational

Positi<>r.r

Sensing

is

standartl. Fixed

llead

Storage is available.

but

must

be tlrdercd

Lry nroclcl.

l'he 3344

l\{oclel

R2F contains

l'ixed

hcad storaqe

anti

the

Model

Il2 does

not.

String

Sn'itch

'Thc

string

:i'witch

fe atttrc

is installcd

on thc 3340-42

(controller)

'I'his

[e'ature

pcrrrtits

thc 3340

strins t<r

bc

dynamicully

sharecl

by two

slorage control

tlcvices

-I'he
fcaturc'

inclrrclcs

two

intcrlockccl

F-,na[rlc,/Dis:rhlc

switchcs alkrwing

the

strirrg

1o

bc

declicirtcd

to

crthe r

storalle control

ttr acc:cssihle

by

cach.

A re ulotc

contr()l

srvitch

pcnnitting

thc switclres

to

hc activatc<l

lrom a

l5li

or l6lt

Nlultipr<)ccssor

is also lrvailablc.

3340/3344

STORAGE

CONTROL

l'age ol

(i

Al.6- |

(r

I

()--l

Rcvrsccl M:rv 2('. l()76
Iiv

-l'Nl.:

(;N26-O.r2l{

AND

FEATURES

Rotational

Pnsition

Sensing

Thc

Rotatittnal

Position

Sensing

(RPS)

fcattlrc-

recluces

lhe channel

contrection

timc

requirecl

to

scarch for

a

given

recortl al'te

r thc

track

ancl hcad

have

treen

sclccted.

This

ferature

(optional

tltl the 33"10,

stanclard

<in the 3344)

disconnects

ther

drivc

from thc

channcl

anrl

pe

rmits

other channe

I operations

to

bc

rlerfornred

during

the

timc

requirccl

for the

spinclle

to [rring

the

rctluircd

rccortl

to the

re

rrd

z

writc hcatl.

Additi<lnal

cletails

on

RPS ancl

its associate

cl conr-

mancls

arc

fottncl

in thc

following

ptrblicati<lns:

c

Re.ferente

Mattutt/

f'or

Integraled

Stt;roge

C'ontrol.

Orclcr

No. CiA26-I62.0.

o Re.ft:rent'e

Manuol

for

-18-1

0-)

Storage

C'ontrol,

()rclcr

No. GA26-

1617.

F'ired

FIeads

1'hc 3340

lixccl

heacl

feature

pcnnits

use

ol thc

334t't-70F

data

rnodule

on

ar.ry

3340

drivc tl'rrt

has

[-reen

converted

for

fixed

hear-l

r.rsc. This

70-mcgabytc

cleta

mclilulc

contains

lixed

heads

in addititlu

ttl

tl.tc

rrormal

acccss

hcacls.

With

thcsc

l'ixed

heacls. 500

tl.rousancl

hytcs

tll st()rage

are

availablc

that

have ze

r<r

seek

timc.

Thc

fcrttttre

tlocs

not ittcrease

data

trroclttle

st(.)rage.

bccattse

an equivalent

ltllloLlnt

of storagu'

runctcr

thc

ntovit-tq

hclds

bcconrcs

inaccessiblc.

'I'hc

3344-R2I:

clual-dril'e

is also

cquippcd

with

fixed

he rd

st<lragc.

ln this

nl<lclcl,

both

3344

tJrivcs havc

I .004

milliotr

fryte s of

zero

seek

title

storallc.

This

fixed

hcad

storagc is

associatecl

tlnly

with thc

primary

adrlresses

on

c.tclt 3344

ilrirc

(sec

F-igurcs

2 antl

3).

fior

f rrrthcr elcttrils

on

the

I'irecl

he

ad Icatttrc

arld

its

r.rscl'rtlnt:ss [()

y(lur sl-oragc

rrpplication. c()lltact

\'otlr

f fJM

s;.rlt:s

rcprtsctttativc

()r

sec

lhc

[:i.r'etl

l]ettd

["eulrrrr

I

;.sr

rt

()uir]e.

()rdcr

No.

(iAl6-

l

632.

l.l+o/I1.1-+

Slontqc

(

otIit-ol

lttttl

I titlLttcs

CONFIGURATIONS

'f

he various

configurations

of

3340/3]i44

disk

storage

arc

dividcrl

into

two

groups:

configurati<tns

using

only

3340

units,,

and

configurations

using

a combination

of

3340

and

3344

units.

These

attachmerrt

methods.

listed

by nrodel,

follow.

3340

STORAGE

WITHOUT

3344I

In some

System/370

models,

strings

ol'3330

ancl

3350

storage

devices

can

be uscd

in

addition

to the

3340s.

Model

115

(lISDDA)

Thc

Modcl

I 15 uses

the

Direct

Drive

lr,ttachment

(DDA)

for

storage

control.

Four

drives

can

be

attaclred:

a 3340-A2

dual

drive

with

control.

and

a

3340-82

(dual)

or B I

(single)

drive.

Model

125

(l25DDA)

The

Moclel

125 uses

the

DDA for

stormge

control

ancl

can

ail-ach

one string

of

up to

eight

332f0

drives.

Model 135

(IFA)

The

Model

135

uses

the Integrated

File

Attachment

(lFA)

for storagc

control.

Sixteen

drives,

two

strings.

a

3340 string

and

a string

of

either

3340

or

3333/3330

drivcs

can

be attached.

Models

145,

155-II,

158,

165-II,

and

l6S

(3330-2)

Models

145,

158,

and 168

(ISC)

Storage

control

for

the models

shown

irs

either

a

31330-2

or an

Integrated

Storagc

Control.

The

3830-2

and

each ISC

path

can

attach

up to

32 drives;

four

strings

of

3333/3330s,

3340s, or

3350s in

any

cornbi-

nation.

3340

/

3344

CONFIG

URATIONS

When

the

3344 is

used, neither

3333

/333O

nor

3350

drives can

be attached

to

the same

storage

conl.rol.

A

3344 requires

four

logical

addresses

for

each

drive.

only rhe 135,

145,

155-II, 158,

165-il,

and 168

support

the

3344 dual

drive.

Model

135

(IFA)

The

Model 135

Integratecl

File

Attachment

has

a

maximum

of

34 logical

addresses.

'fhis

allows

two

storage

strings

to

be attached:

a

3340 string

and a

3340/3344

string

(see

Figure 2).

Models

145,

155-II,

158, 165-II,

and 168

(3830-2)

Models 145,

158,

and 168

(ISC)

Sixty-four logical

addresses can

be used

by a

3U30-2

or ISC

path

when a3340/3344

configurarion

is

attached.

Two

strings

of 333O/3344s,

a 3340 string,

and a short

string

of four

3340 drives

can bc

attached.

Figure

3 shows

the maximum334O/3344

configura-

tion.

Only

strings

0 and 2 can incorporate

the

3344

units.

E,ach

drive has

the hexadecimal

addrcsses

assigned

relative

to

the storage

control

as shown.

4

tgll 3l+0,/.1.1

Rcfercncc

Manual

02
1_9

Lq

1C

a3-

1l_

u-

1D

Drive 0 1
No,

String

1

3340-A2

3340-82

3340-82

Drive0

12345

No.

"

Primary Addresses

lrigure

2. IFA 334013344

Maximum Configuration

(Hexadecimal

Adclressing)

3340-82

Drive

No.

01

String

1

3340-A2

01

String

2

3340-A2

3340-82

Drive
No.

Drive

2

3

No.

String

3

3340-A2

3340-82

*

Primary

Addresses

Figure 3.

ISC or

3830-2 |\34013341

Maximum

Configuration

(Hexadecimal

Addressing)

07"
27
2F
37

02*
22
2A

n

19"

1D

39

so

17*

Tr

3B
3F

16*

G

3
3E

10*

20

n

30

11*

n

n

3

18

lts

1A

I

re

Cor.rfigurations

P:rgc

ol'

(i,

\iifr- l o

t

(,

-l

Rcviscd

l\4rr1,

26. l()7(r

Uv

I-Nt,:

(lNl6-0l2l.i

IBM

3348

DATA

MODULIE

DATA n*TODULE

TYPES

'fhe

3340 nroclels uscr thc

IBM

334u Data N,lodulc

as rr

storagc merJiurn.

-f
hree typcs

are avoililble:

the 334lJ

Modcl

35

with

aborrt 35 million

bytes of storaqe" the

33411

Moclcl

70 with about

70 milliorr t'ryies

ol'storage.

ancl the

334l;i

Model

70F

rvith

about

70

rrrillion

bytes

including

one-half million hytes

undcr ifixu-d

hcads.

'fhe

Moclt:ls

35

ancl

70 can be frccly

t:xchangecl

()n

the

-l3rtO clrivcs. but ther Nlclclel

7()[r

can usc its l'ixed heacls

()nlv

on

3-1,10 clrives that l.rave been

convcrtcd I'or

Moclel

70F rr-se

'Ihe

334tJ-lr0F data nrotlule has

tl.re sanrc

char:lcteris-

tir:s as the

3341{-70 cxcept that

r-:f

iinderrs

I thror-rgh

-5

arc acccsscd by

the I'ixed heads. [)ata

r.rn

tracks uncier

thc I'ixed heacis is ar,'ailablc with only rotational

delay.

-fl.rc
othcr

tracks

(cylinders

0 antl {i tlrr,rugh

695) are

suhje

ct to

norrnnl

lreacl access

cle

lays.

Thc thrce rlata
t ii:s:

Bytc

Captcitv

Pr:r imck

Per e

vlinder

Pcr rtt,lilul,:

nrodules have lbe

follt;vrins

charactcris-

DATA

I\T0DUI-T]

INITI ALIZATIII)N

All

l34l{

data rlorlrrlcs arc iniliiilizerl wlr,.lr

nt:rnulac-

trrrcil. llornc

aclclress anrl

l{-bvte

clcscri;rLors

(R0)

lrrc

wriItcrr on

crrch track. If l skipplhlc rl,.'lr:ct

i:i

fourrrl.

tlrc

q'rrttt'n

lrontc

atlclrcss conlains tlrc rtkin rlisplace-

lrcnt hvtc\. [)trrirtg n0rnral

()pcrllti(\ns

tl]e

sl,{)ra!_Ic

conlrol uses thc skip

displacenreltt br.'tc's 1o bypass

llrc

dcicctivc

arca.

Il'a mcrdule data

area bccomes defective cluring normal

usc,

IBN'l

utility

progranrs

are available to flag

dcfcc-

tivc tracks and assign alicrnates

if

required

(DASDI

and AII-AS for

OS

and AL'IDK for DOS).

DATA

ST-JRFACE FORMAT

Thc disk data surface is

dividecl

into

concentric bands

of clata

called tracks

(see

Figure 4). [,ach

datir surface

uses two

rnagnetic

lcad/wr-ite heads. one for

the insicle

irac:ks ancl

one

l'or the clutsictre tracks.

'Ihc

rercording

surlacc o1 the

disk

is

clivicled

in

hall'. All odd num-

bcrecl

l.r;rcks are on one side ol'the divitling Iinc

and all

evern

nunrhere,-'l

trircks are on the o1her. The odd inclex

point

starts

the ocld trac:ks ancl the cven index starts

tire

evcn.

When

thc lreacls are at a

given positior.r,

they

scrvice four

tracks: one odd,

one:

even, one insicle. and

one otrtsiclc.

In

the 334lJ-35 tl:rta nr<ldulc the tracks unclcr the three

outside

heirds ancl those under the three insicle heads

form

a cylinder. All

odd numberrcd tracks

are on one

side of the three

disks arrcl the even

tracks

on the other

sidc. In a

single drive revolution each ht:acl covers tw<r

tracks; one

ocld. and one even.

All

cylinders are

consecrrtively numbered lor a total

of

34it.

I'hi:

-1341{-70

data rnodulc contair.rs four

cltsks. J'he

track

gcomctry

is thc samc as that of the smaller

data

rnoclulc with a cvlindcr irvailablc at cach

position.

Oclcl

numhcred

cylinclers are on thc

uppcr thrce surfaccs

ancl thc

cven

c5,linders are on thc

lower

threc. Fronr a

single

position

lwo

consecutivc

(cven

and odci)

cyliudcrs

can hc

accesscd

1sec

F'igure

5).

The' dii'fcrcricers

he

l-wccn thc storagc mcdia uscd on thc

3340

cluta

st()ritge

units follow:

3348-35 3348-70/70t,

Da(lr

Surfaccs

per

Mcidr"rle 3

(r

2

69(r

2
2

2

t2

24

l2

1

Phvsical lleads ner Surlacc

2

:r348-3s

ii,36l(

l(X).4 l(r

-''il.9d4.7()ll

3348--70/70F

I,368

l(x).416

6'). tt 39.5

3

()

l,.ogicui Cylindr:rs

pcr
A lt rrrr ate
Ci;

l

.ogrcal f-'1,1 inclcrs

pcr

Phvsic:lrl

L-ylindt:r

Physicrii'l'r;rcks

pcr

Plr-vsic:al

Cylincler

l.ogic:rl

-['rai:ks
per

I'hYsical

(--)'Iinder

| .ogicrl I racks

pcr

I ogical

(lvlintlcr

L.ogicnt lrack

pe

r

Physical

'l

rae k

Mocltrle :348

I
I

I

t)

l2
l2

1

(t

llJNl l"t-ll:)/-l.i ltclclcnce Nlanrr;rl

r' l',"

i"

tr,

ta

\.

tt.

t'-\i-.-

i-\i_11_--:-=

=1;1-j,

---

\\

--

--=-__:-_---

./

\ -? ,./-

EVEN TRACK

70

Megabytes

Cylinders
001,003,

005,......699.

(heads

6-1

1

)

Even

lndex

Point

Figure

4.

Data

Surface'frack

l,avorrt

Odd

lndex

Point

)

.,,,nr.,,

\

000,002,

I

oo4,......698.

)

{rreaas

0-s)

Both

Odd

and

Even

Cylinders.

Odd tracks

fo!low

odd index;

even

tracks

follow

even

index.

l"*.

t

n*o'

Odd Cylinders
001,

003.

005,

.......699,

(heads

6-1

1

)

Even

Cylinders
000,002.
004,

......698.

(heads

0-5)

Note:

/n

he

3348-70F data ntodule,

cylinders 001-005

are

located

on the

bottom

surface of the bottont disk.

Figure

5. Data

Module

Ceornetrv

1o,,.

t

'*o'

IBM 3348 Data

Module

FORMATS

RECORD

FORMAT

The basic

unit of information

recorded

by

the drive

is

a byte consisting

of eight

bits.

A

group

of bytes

separated

by a

special

gap

is called

an area.

Areas

are

combined

to make

a record,

the logical

unit

of inform-

ation.

A record

consists

of

count,

key, and

data areas.

Count Area

The

count area

contains

the location

of

a data record

on a

specific track

and defines

the

size of

tlhe key

and

data

areas of the record.

The

count

area is

written

when the

record is formatted

and is not

changed

until

the record is

reformatted.

Key

Area

Use

of

the key area is

at the

discretion

of the

program-

mer. When

used, the key

area of

the record

contains

the

primary

identification

of the

data

portion

of the

record

(such

as social

security number,

man number,

part

number).

Once the key

area is formatted,

the contents

(but

not

the length) may

be altered.

If the key

area

is altered,

the data area

of the record

must also

be rewritten.

Data

Area

The data

area contains

the information

identified

by

the

count and key

areas of the record.

Data informa-

tion is

organized

and arranged

by the

programmer.

The

length

of the data

area is

defined by

the count

area.

Once the data

area is formatted,

the

contents

(but

not

the length)

may be

altered. The

contents

of

the

data area may

be altered

without affecting

any

other

area in the record.

TRACK

FORMAT

All tracks

are initially formatted

beginning

at an index

point

(see

Figure

6).

Each

track has

the

same basic

format:

home

address, track

descriptor

record,

and one

or more data records.

The records.

and areas

within

the

records,

are separated

by

gaps.

Home Address

Each track

contains one home

address, which

defines

the

physical

location

of the track

(track

address)

and

the

condition of

the track. Home address

is the first

recorded area

following

an

index

point.

Specific commands

are used

for

writing and reading

a

home address

area: Write Home Address

and Read

Home

Address. Home

address

is

normally rewritten

to

flag the defective

track. Writing home

addresses is

usually done at

the

IBM

plant.

Track

Descriptor Record

(R0)

This

record is always

the first record on the track

following

the home

address area. In IBM

program-

ming

systems, the R0 count field of

the defective

track

provides

the address of the alternate track.

If it is

an

alternate track,

the

R0

count area

proyides

the

address

of

the defective track. An

8-byte

data field

is used to

store

the

number

of bytes remaining

on the track.

Specific commands, Write R0

and

Read

R0, are used

for

writing and reading the track

descriptor record.

Data Records
One

or more

data records may follow the track

descriptor record

(R0)

on a track. Record format

is

determined at the time the count, key, and

data areas

of the record are

originally written by execution of a

Format Write command.

The format of the record is

rewritten by

another Format Write command.

Data records, as

well as track descriptor records, can

be formatted with or without keys.

Generally, file

organization determines whether keys are

used.

RECORD OVERFLOW
The record overflow

function

provides

a

means

of

processing

logical records that exceed the capacity

of a
track. When using overflow records, the cylinder
boundarv limits the size of the record.

8

IBM

3340144

Reference Manual

Equal length records : 8,535

(track

capacity)

C

+

KL + DL

(bytes/record)

Track : 8,535

>

where:

track

where:

C(overhead/record):

167 if KL

:

0

=242ifKL+0

KL:

Key length

DL: Data length

The number of

records

(n/

of different key

and data

lengths that can be

recorded on a track must

satisfy

the following equation

(the

standard R0 is already

accounted

for):

Records n

Ic

*

KL(i) + DL(i)

i:1

167ifKL:0

242Lt KL

+

O

TRACK

CAPACITY

The number of records that can be recorded on a
track

depends on the record size. The following

equation

can be used to determine the number of

equal

length records

per

track.

The home

address and
standard R0 space and skip defect are taken into
consideration.

When R0 is

not

standard, the

following

formula should

be used:

Records

=8,'706

>-

[KL(o)

+

DL(o)

+

C-4]

+

Track

n

where:

f,

trufil

+

DL(i)

+

cl

i:1

c:167

if

KL:0

c:242if

KL+0

The tables shown in

Figures 7

through l0

give

maxi-

mum sizes of n equal-length

records on

a track where

n

is

all

possible

values.

Track, cylinder, and

data

module capacities

are

given in

both the

number of

bytes and the

number of

records.

There are tables

for records

without keys, and for

records with

keys. In all

tables, overhead for home

address and standard

record

zero

(KL

:

0,

DL : 8)

is

already

accounted

for.

C:
C_

Formats

9

Track

Format

-.-

SD

I

PAIFICCI

HHI

DCB

(syrt.t
J

oata

G3 ( (svste./

/storus.

\Control)

1'Disk

to

]storus.

o'13:lJ"'

I

t0"".

I

I

or""

)

lt

t/

ffi

associated gap.

G2

f-

Ro

c.*,

I

ry

I

G2

I ndex

1\

Lrl

G2

G2

INDEX:

Inclicates

the beginning

of each

trar:k.

All

tracks

on

the

disk

surfar:e

are

synchronized

by

Index.

G1

(Gap

1): Separates

Index

and

Home

Address.

HOME

ADDRESS

SD

(Skip

Displacemer.rt):

Storage

control

indicators

for

skip

displacernent r:oncl

ition

of track.

PA

(Physical

r\dciress):

Storage

control

check for

verification.

Note:

Ihe

SD

artd

PA

bytes are internal

conventiorts

involv-

ing

only

the

storage control

and drive.

The

function

is

transparent

to the

using

systetn.

F

(Flag):

Defines

track condition

as follows:

Bit

0 - Skip

Displacement

Bits

1,2,4,

and 5

--

Unused.

Bits

6 and 7

00 = Normal

Track

01 = Alternate

Track

10=

I

11

|

Defective

Track

The

flag

byte

rray

be transferred

to

and fronn

the using

system. lt rs

tire

only flag

byte transferrable,

CC

(Cylinder

Number):

Specifies

the cylinder

numDer:

For

3348

35

0 to 347

For

3348-70

0 to 695

For

3348 7OF

0 to

695

(cylinders

1-5 fi>red

heads)

HH

(Track

Nurrrber):

Specifies

the readlwrite

track number

with

the selected

cylinder:

For

3348-35

0-1

1

For

3348-70

0-11

For

3348-70F

0-1

1

(cylinders

1-5

fixed

heads)

DCB

(Detection

Code

Bytes):

Generated

by

the 3340-,42

and used

for

error

detection.

l;igurc

6.

Record and

Track

lrornrat

l0

IBM

3340144 Reference

Manual

G2

t

Standard

R0

does

not

contain an R0

key

area

or

G2

(Gap

2):

Separates

home

address

and

R0

counr

area.

RECORD

ZERO

RO

COUNT

AREA

SD and

PA:

Same

as

Home

Address.

F

(Flag):

Defines

track condition

identifier

for

overflow

recoro

s.

Bits

0-2

*

Skip Displacement

Indicators.

Bits

3 and

5 - Unused,

bit 5 is

always

zero.

Bit 4 - When

on, indicates

that a logical

record

continues

on the next

track.

Bits

6 and 7

-

00 = Normal

Track

01

=

Alternate Track

10=

) |

ii=l

DefectiveTrack

CC

(Cylinder

Number):

Specif ies

the cylinder

number:

For

3348-35

0 to 347

For

3348-70

0 to

695

For

3348-70F

0 to 695

(cylinders

1-5 fixed

heads)

HH

(Track

Number): Specifies

the read/write

track

number

within

the selected

cvlinder.

For

3348-35

0-11

For

3348-70

0-1 1

For

3348-70F

0-1

1

(cylinders

1-5 fixed

heads)

R

(Record

Number):

Normally has a value

of Hex

00.

KL

(Key

Length):

Specifies

the number

of bytes in

the R0

key

area, from'0-255

bytes.

For

standard R0.

this

normally

has

a

value

of

Hex

00.

DL

(Data

Length):

Specifies

the

number

of

bytes in

the

R0

data

area,

from

1 to track

capacity.

For

standard R0,

tlris

normally

has a value

of

Hex

08.

DCB

(Detection

Code Bytes):

Generated

by

the 3340-42

and

used

tor

error detection.

Track

Format

Disk

to
Storage
Controi

Data

I

)G3

)

G2

(Gap

2):

Precedes

all key

areas.

RO KEY

AREA

KEY

AREA: ldentifies

information

in

the data

area.

For

standard

R0, this

area is not

present

on the

track.

DCB

(Detection

Code Bytes): lf

key area

is written,

these

bytes are

generated

by the 3340-42

and used for error

detection.

G2

(Gap

2):

Precedes

all data

areas.

RO

DATA AREA

DATA AREA:

Contains

the information

identified

bv

the

count

and

key

areas.

DCB

(Detection

Code

Bytes): Generated

by

the 3340-42

and

used for

error

detection

and correction.

DATA

RECORD

COUNT AREA

(R

1--Rn)

G3

(Gap

3):

Precedes

all

count

areas, except R0,

DATA

RECORD

DATA RECORD

COUNT AREA

F

(Flag):

Same as Record

Zero.

CC

(Cylinder

Number):

Specif ies

the cylinder number:

For

3348-35 0 to

347

For

3348-70 0 to

695

For

3348-70F 0 to

695

(cylinders

|

-5

fixed heads)

I ndex

HH

(Track

Number): Specifies

the

read/write

track

number

within the selected cylinder:

For

3348-35 0-11

For

3348-70

0-11

For

3348-70F

0-1

1

(cylinders

1-5

fixed

heads)

R

(Record

Number):

Specifies

the

sequential number

of

the record

on

the track if

specified by

programmer.

KL

(Key

Length):

Specifies

the number

of bytes in

the

key

area, from

0-255 bytes.

DL

(Data

Length):

Specifies

the number

of bytes in

the

data

area,

from

1 to track capacity.

DCB

(Detection

Code Bytes): Generated

by

the 3340-42

and used for

error

detection.

G2

(Gap

2):

Precedes

all key

areas.

DATA

RECORD

KEY

AREA

(R1-Rn)

KEY AREA: ldentif

ies information

in

the

d,ata area.

DCB

(Detection

Code Bytes): Generated

by

the 3340-42

and used for

error

detection.

G2

(Gap

2):

Precedes

all data

areas.

DATA RECORD

DATA AREA

(R1-Rn)

DATA AREA:

Contains

the information

identified

by

the count

and

key

areas.

DCB

(Detection

Code

Bytes):

Generated

by the 3340-42

and

used for error detection and correction.

G4

{Gap

4): Padding from

end

of the

last data

area to

Index.

lf used for

defect skipping, G4 is cent.ered

over the

defect.

Formats I I

Key DCB

Record

Length

Track

Capacity

Cylinder Capacity

(DL)

(Bytes)

(Records)

(Bytes)

(Records)

(Bytes)

8,368
4,1

00

2,678

1,966
1,540
1,255
1,O52

899
781
686
608
544
489
442
442
366
335
307
282
259
239

220
204

188
174

tol

149

137

't27
't

17

108

99
91
84

76
70

63

57

51
46
41

36

.31

26

22

18
14
10

7
3

1

2

4

5

o

ti
q

10
l1

12

IJ

14

tc
to

17
18

't9
20

21
22
23
24
25
26

27
28
29
30

JI

32

JJ

34
35
36

JI

38
39
40
41
42
43
44
45
46
47
48
49
50

8,368
8,200

8,034

7,864
7,700
7,530
7,364
7,192
7,O29
6,860
6,688
6,528
6,357

6,1 88

6,030

5,856

5,695
5,526
5,358
5,1 80
5,019
4,840
4,692
4,512
4,350
4,186
4,023
3,836

3,683
3,510
3,348
3,1

68
3,003
2,856
2,660
2,520
2,331
2,166

1,989
1,840
1,68i
1,512
1,333
1,144

990
828
658
480
343

150

12
24
36

48

60
72
84
96

108

120

132
144

r56
168
180

192
204
216
228
240
252

264
276
288
300
312
324
336
348
360
372
384
396
408

420

432

444
456
468
480

492

504

516

528

540

552

564

576

588

600

100,416

98,400
96,408
94,368
92,400
90,360
88,368
86,304
84,348

82,320

80,256

78,336
76,284
74,256
72,360
70,272
68,340
66,312
64,296
62,1 60
60,228
58,080
56,304
54,144
52,200
50,232

48,276
46,O32
44,196

42,120

40,176
38,016
36,036

34,272

31,920

30,240

27,972

25,992

23,868

22,O80

20,'t72
't8,144

15.996
13,728

1 1,880

9,936
7,896

5,760

4,116

1,800

Figurc

7.

Rccord

(lapacities

per

Track and

('ylinder

-

Without Keys

12

IBM

3340/44

Reference Manual

MODEL

35

MODEL

7OI7OF

Records

Bytes

Records

Bytes

4,176

8,352
12,528
16,704

20,880
25,056
29,232
33,408
37,584
41,760
45,936
50,112
54,288
58,464
62,640
66,816
70,992
75,1

68
79,344
83,520
87,696
91,872
96,048

100,224
104,400
108,576
1't2,752
116,928
121,104
125,280
129,456
133,632

137.808
14

t

,984

1 46,1

60

150,336
154,512

158.688
162,864
167,O40
171

,216

175,392
179,568
183,744
187,920
192,096
196,272
200,448
204,624
208,800

34,944,768
34,243,200
33,549,984
32,840,064
32,155,200
31,445,280
30,752,064
30,033,792

29.353,1

04
28,647,360
27,929,O88
27,260,928
26,546,832
25,841,O88
25,181,280
24,454,656
23,782,320
23,076,576
22,375,OO8
21,631,680
20,959,344
20,211,840

19,593,792
18,842,112
1

8.165,600
17,480,736
16,800,048
1 6,01 9, 1 36
15,380,208
14,657,760
13,981,248
13,229,568
12,540,528
1 1,926,656
1 1

,1

08,1 60

10,523,520

9,734,256
9,O45,216
8,306,064

7,683,840
7,019,856

6,314,112

5,566,608
4,777,344
4,134,240
3,457,728

2,747,808

2,OO4,480

1,432,368

626,400

8,352

16,704

25,056

33,408

41,760
50,112
58,464

66,816

75,'t68
83,520

91,872
100,224
108,576
1 16,928
125,280
133,632
141,984
150,336
158,688
167,O40
175,392
183,744

't92,096

200,448
208,800
217,152
225,504
233,856
242,208
250,560
258,912
267,264
275,616
283,968
292,320
300,672
309,024
3',t1,376
325,728
334,080
342,432
350,784
359,1

36
367,488
375,840

384,192
392,544
400,896

409,248
4't7,600

69,889,536

68.486,400
67,099,968
65,680,1 28
64,310,400
62,890,560

61,504,128
60,067,584
58,706,208

57,294,720

55.858,1 76
54,521,856
53,093,664
51,682,176
50,362,560
48,909.31 2
47,564,640

46,153,152

44,750,O16
43,263,360
41,918,688

40,423,680
39,187,584
37,684,224
36,331

,200
34,961,472
33,600,096
32,038,272
30,760,416

29,315,520

27,962,496

26,459,136

25,081,056

23,853,312
22,216,320

21,047,O40

19,468,512
18,090,432
16,612,128
15,367,680
14,O39,712
12,628,224
11,133,216

9,554,688

8,268,480
6,915,456
5,495,616
4,008,960
2,864,736

1,252,800

Figurc

8. Record

Capacities

per

Data

Module - Without Keys

Formats

l3

Record

Length

Track

Capacity

Cylinder

Capacity

(KL+DL)

(Bytes)

(Records)

(Bytes) (Recordsl

(Bytes)

8,293
4,O25
2,603

1,891
1,465

't,180

977
824
706
611
533

469

414

367

327
291
260
232
207
184
164
145
129
113

99
86

74

62

52
42
33
24

'16

1
2
3
4
5

o

7
8
9

10
1',|
12
13
14
15

16

17
18

19
20
21
22
23
24
25
26
27
28
29
30
31
32

JJ

34

8,293
8,050
7,809
7,564
7,325

7.080
6,839

6,592
6,354
6,110
5,863
5,628
5,382
5,1 38

4,905

4,656
4,420
4,176

3,933

3,680
3,444
3,1 90

2,967

2,712

2,475

2,236

1,998

1,736

1,508

1,260

1,023

768
528
306

12
24
36
48
60
72
84
96

108
120

132
144
156
168
180
192
204
216
228

240
252
264
276
288
300
312
324
336
348

360
372
384
396
408

99,516
96,600
93,708

90,768

87,900
84,960
82,068
79,104
76,248
73,320

70,356
67,536

64,584
61,656
58,860
55,872
53,040
50,112
47,196
44,160
41,328
38,280
35,604
32,544
29,700
26,832
23,976
20,832
18,096
15,120
12,276

9,216
6,336

3.672

Figurc 9.

Re cord

Capacities

pcr

Track and Cylinder

-

With

Keys

14

IBM

3340144 Reference

Manual

MODEL

35

MODEL

70/7OF

Records

Bytes

Records Bytes

4,176

8,352
12,528
16,704

20,880
25,056
29,232
33,408
37,584
4',t,760
45,936
50,112
54,288
58,464
62,640

oo,b

tb

70,992
75,1

68

79,344
83,520
87,696

91,872
96,048

100,224
104,400
108,576
112,752
1 16,928
121,104
125,280
129,456
133,632
137,808
141,984

34,631,568
33,616,800
32,610,384
31,587,264
30,589,200
29,566,080
28,559,664
27,528,192
26,534,304
25,515,360
24,483,888
23,502,528
22,475,232
21,456,288
20,483,280
19,443,456
18,457,920
17,438,976
16,424,208
15,367,680
14,382,144

't3,321,440
12,390,192

11

,325,312

10,335,600

9,337,536
8,343,648
7,249,536

6,297,408
5,261,760
4,272,048
3,207,168
2,204,928

1,277

,856

8,352

16,704
25,056
33,408
41,760
50,112
58,464
66,816
75,1

68
83,520
91,872

100,224
108,576
116,928
125,280
133,632
141,984
150,336
158,688
167,O40
175,392
183,7 44

r 92,096
200,448
208,800
217

,152

225,504
233,856
242,208
250,560
258,912
267,264
275,616

283,968

69,263,1 36
67,233,600

65,220,768
63,174,528

61

,1

78,400

59, 1 32,1

60
57,119,328
55,056,384
53,068,608
51,O30,120
48,56t,176

47,005,056
44,950,464
42,912,576
40,966,560
38,886,91 2
36,915,840

34,877,952

32,848,416
30,735,360
28,764,288
26,642,880
24,780,384
22,650,624

20,671,200
18,675,072
16,681

,296

14,499,072
12,594,816

10,523,520

8,544,096
6,41

4,336

4,409,856

2,555,712

Iigurc

10. Rccord

('upacitics

per

l)ata Modrrlc Witlt

Ke1,s

Formats

l5

INPUT/

OUTPUT

OPERATIONS

This

section

contains

a

general

description

of l/

O

operations

used

with IBM

disk

storage

devices.

Detailed

information

about

the

central

processing

unit

and channel

program

control

of I/O

operations

is

foundin

IBM

System/370

Principles

o,f

Operation,

Order No.

GA22-7000.

DEVICE

SELECTION

AND

ADDRESSING

Device

Address

3340 DRIVES
Drive

addresses

are specified

in

the

I/O

instruction.

The

3340 address

is specified

in

bits 4,

5.,6, and

7 of

the

address

byte

(byte

3);

bit

3 is also

used

with

32

drive

addressing.

Any

drive address

from

hex

0 to F

can

be accepted.

Drives

0 to 7

are attached

to the first

con.troller

string

and drives

8 to F

on

the second

string.

If

a logical

connection

cannot

be made

because

the required

drive

is

offline,

Unit

Check

(Intervention

Required)

is

returned.

If multiple

selection

is detectecl

because

of

a

hardware

failure,

Unit Check

(Intervention

Required)

is returned.
Note:

Ifte drive

addresses

must

be wired

on a

logic

board

in the

drive

units.

3344

DRIVES

For

configurations r"rsing

3344

drives,

lhe device

addressing

is

modified

to handle

the multiple

logical

devices

on each spindle.

Bits 2

througJr

7

of byte 3

specify

the

logical

device

(a

maximum

of 64) and

bits 0 and I

the storage control

address. This

addressing

allows 3344

drives

on strings 0

and 2 only.

String 3 can have

only two 3340

units.,

one A2

and

one

B

(see

Figure

3). When

3344

drives

are attached

to

a storage control,

only 334013344

clevices can

be

controlled; 3330

or 3350

strings

cannot be

attached.

Seek Address
A specific

track

is selected

by sending

the

seek address

and

a Seek

command

to the

required

drive.

These

and

other commands

are described

in

the ISC

and

3830-2

reference

manuals.

Bytes 0 and

I are

unused,

bytes 2

and

3 ilre the

logical

cylinder

address,

and bytes

4 and

5 are

the logical

track address.

All seek

addresses

consist

of

six bvtes.

012345

OOCCHH

The

CCHH

part

of count areas

and home

addresses

normally

corresponds

to

bytes 2 through

5 of the

seek

address. The

physical

address

(PA)

bytes

in each

count area and

home

address indicate

physical

cylinder

and track addresses.

The PA

bytes are

written

by

the

storage control

and are

used for

seek verification.

When

the seek

argument

is received

by

the storage

control, it

is converted

into

physical

cylinder

and track

addresses

and sent

to the

selected

drive for

Seek

operations.

The

acceptable

seek addresses

for

the

3340/3344

devices

are:

ACCESS

AND DATA

TRANSFER

SPEED

The

total time required

for access

and data transfer

consists of access

motion, head

selection, rotational

delay, and data

transfer.

Access

Motion Time

Access motion

time is

the

time

required

to move

the

read,/write heads

to the correct

cylinder. If the

heads

are already at

the correct cylinder,

the access

time is

zero. Access

time is

also

zero

for data stored

under

fixed

heads when fixed

head models

are used.

If

the access mechanism

must move

to another

cylin-

der, a minimum

of 10 milliseconds

is required.

The

maximum access

movement is

50 milliseconds.

but the

average access

time is 25 milliseconds.

Head

Selection Time

The time required

to select the read/write

head

is

negligible.

Storage
Model

Data Tracks Alternate Tracks

cc

HH

cc HH

3348-35

a-347 0-'11

348

0- 11

3348-70
3348-70F

0-695 0-

11

696,697

0-

11

3344-82

3344.82F

0- 695

x4

0- 11 696,697

x4

0-11

l6

IBM

3340144

Reference

Manual

Rotational Delay
Rotational

delay is the time required

for

the desired

record area to reach

the read/write

head so

that data

transfer can begin. This

time can range

from zero

to

almost a full revolution.

Half a revolution

(average

rotational delay) is

generally

used for

timing

purposes.

The maximum

and average rotational

delays for

3340

/

3344

drives

are:

Maximum rotational

delay : 20.24

milliseconds

Average rotational

delay : 10.12

milliseconds

Note:

Use of the Rotational Position

Sensing

featire

minimizes

the effect of rotational

delay

by

permitting

the drive to disconnect

from

the

channel,

thereby

allowing use of other

drives during

a

latency

period.

Data Transfer

Nominal read/write

rates for

the disk drives

are:

Bytes-per-second

:

885,000

Microseconds-per-byte

=

1.13

DATA

SECURITY AND PRIVACY

The 3340 and

3344

have a Read

Only function.

This

function,

in conjunction with

previous

methods

such as

File Protect

and Seek Verification,

offer a means

of

limiting

access to data areas

of the data module.

Read

Only Function

3340

MODELS

The Read

Only

function

provides

the means for

protecting

designated

data modules from

being

rewritten or erased.

Each

data module is equipped with

an inset in the

handle. The operator can change

the inset

position

before inserting the data module in

the drive.

Note: Iftis insert is only accessible

when the data

module is not on the drive

(see

the

"Operating

Instructions" sect ion).

When

the Read Only option is made,

any Write

command addressed to the drive is rejected.

Subse-

quent

sense Lnformation indicates

Command Reject

(byte

0,

bit 0) and Write Protect

(byte

1, bit

6).

3344 MODELS

In

the 3344

dual-drive

models,

the

Read Only func-

tion

is controlled

by a

switch

on the operator

panel

for

each

drive.

File Protection

Control of Write and

Seek

commands within a

pro-

gram

can be affected by the Set

File

Mask command.

A description

of the Set

File Mask

command is

given

in

the

ISC

and 3830-2

reference manuals.

By entering a

Set

File Mask, selected Write and

Seek

commands can be inhibited even though they appear

in

the

command

chain.

Seek

Verification

The 334O/3344 track

format includes two bytes in

each count area and home address

(physical

address,

PA) for seek verification. When a count area or home
address is

processed

during

Read,

Search, or Clock

operations, the bytes are compared

with the most

recent seek address. A non-compare

results in

termi­nation of the operation at the end of the count area or
home address with channel end, device end, and unit
check. Seek check

is also indicated in the sense

information.

Input/OutputOperations 17

ERROR

RECOVERY

PROCEDURE

Error

handling usually involves

storage

control

and

system-invoked

recovery actions.

These

recovery

actions

can

vary

depending

on

how

and

to what

system

the

3340/3344 is attached.

The

following topics

are associated

with recovery

actions involving

the 3830 Model2,

or ISC

(storage

controls),

and the

3340/3344:

o

Error

Correction Function

o

Error Condition Table

o

Errory Recovery

Action

ERROR

CORRECTION

FUNCTION

The

error correction function

(ECF)

is

part

of the

recovery

action

procedure.

The ECF

algorithms

and

the related

procedure

are fully described

in the

3830

Model 2 and ISC

reference manuals.

ERROR

CONDITION TABLE

The Error

Condition Table

(Figure

l1)

identifies unique

configurations of sense bits set

by the storage control

in sense bytes 0, 1, and 2. In

addition, it refers

to each

of these configurations in

a specific reco,yery

action to

be invoked by the system.

ERROR RECOVERY

ACTION

The

3340/3344 Recovery Action Table

(Figure

12)

specifies actions to be taken for error

conditions listed

in the

Error

Condition Table.

A necessary

part

of the

recovery action is the construction

of Restart

Channel

Command

Words

1 and

2.

Construction

of Restart CCWs

If Operation Incomplete

(byte

1,

bit 7)

is

set in the

sense information. it indicates

that an error or unusual

condition

occurred during a logical operation

after

data

transfer had been initiated. By constructing

Restart

Channel

Command Words,

the e,rror recovery

procedures

can correct the

unusual condition and

continue

the

operation

in

progress

from the

point

of

interruption

to the

normal ending

point.

RESTART CCW I

Restart CCW 1 is constructed as follows:

l. The

command code byte

is

provided

in sense

byte 3.

2. The data address is that of the interrupted

CCW,

plus

the count of that CCW, minus the residual

count in

the channel status

word

(CSW).

3.

The flags, except Program

Controlled

Interrupt

(PCI),

are

those of

the interrupted

CCW.

4. The

count is the residual count

in

the CSW. If

the residual

count

is zero, a count of one must

be

used. If a Write command

is

in

progress,

the data

address should specify a byte containing

'00'

.

If a Read command is in

progress,

turn on the

skip bit.

RESTART

CCW

2

Restart

CCW

2 is constructed as follows:

l.

The command code

is

provided

in

sense byte 3.

2.

The count

is

constructed

as follows:

a.

Fetch

the

count of the CCW designated by

CSW-8, and set

a

pointer

to this CCW.

b. Subtract the

restart displacement from the

count obtained

in

step

a. If this result is

positive,

go

to step

f; otherwise

go

to step c.

c. Check the

chain data flag of the CCW desig-

nated

by

the

pointer.

If the

flag is not

set,

go

to step e; otherwise

go

to step d.

d.

Advance the

pointer

to the

next non-Transfer

in Channel

(non-TIC)

CCW

in the data chain

and add the count of this CCW

to the counts

of all

preceding

non-TIC CCWs

in

the

data

chain.

Return to step b.

e. Truncation occurs. Set

the restart

CCW

2

count equal to 1. Go to step 3

and include the

skip bit

in

the

Restart CCW flags.

f.

Set

the Restart CCW

2 count equal to the

result of the subtraction

in

step b.

Go

to

Step 3.

l8

IBM 3340144

Reference

Manual

3.

4.

The

flags

(except

PCI)

are

those of the

CCW

designated by the

pointer

in

Step

2. The

skip

bit

is also set if

Step 2e was

previously

executed.

The

data address is

that

of the

CCW designated

by

the

pointer

in

Step 2,

plus

the

count

of that

CCW, minus the Restart

CCW

count

generated

in

Step 2.

If another

Operation Incomplete

occurs

while execut-

ing

the

Restart

CCW,

a new Restart

CCW

may be

generated

from

the old

Restart

CCW.

Note: Be sure to

avoid

destroying the

old Restart

CCW before

generating

the new one.

Error Recovery

Procedure

19

334013344

Error Condition Table

Byte

Bit

Name

General Description

I

Action Logged

0 0

Command

Reject

Progrermming

error

1 No

0 1 Intervention

Required

Drive

off

line, Not

Ready, CE Mode,

or data

module

incom.

patabi

ity

such

as

a 3348

70F

installed

on a drive

that does

not

have

the

Fixed Head

feature.

1

Yes

0 z

Bus

Out

Parity

Bus

Out

parity

error.

.J

Yes

0 Equipment

Check

Equipment

malfunction.

4

Yes

9

4

Data

Check

Data

check

in

home

address, count

area, or key

area;

or

uncorrectable

data check in

data area.

4

Yes

0

5

Overru n

Service

overrun

or

commano

overrun.

4

Yes

0 o

Track

Condition

Check

Non-home

address or

record 0 commands for

a defective

track

or any multitrack

commands switching

from

a

known

alternate

or defective

track.

6

No

0

6 Track

Condition

Check

Operation

Incomplete

Switching

from

alternate track

during overf

low

record

processing

or switching

to a defective track

during

overf I'rw record

processing.

I No

0

Seek Check

Seek incomplete

or

incorrect

physical

address

when

reading

home

address

or

count

area.

o

Yes

0
2

4

I

Data

Check

Correctable

Correr:table

data

check in a non-multitrack data

area or

the data

area of the

last

overf

low

segment.

7 Yes

0
2

1

4

I

7

Data

Check
Correctable
Operation

Incomplete

Correctable

data

check ir-r

data

area of overf

low

segment

is

not

the

last

segment.

8 Yes

0
2

1

0

4

1

1

o

Data

Check

Correctable
Operation Incomplete
Track

Condition

Check

Correctable

data

check in the data

area of an overflow

segment

(not

the last

segment) of an alternate track

8A

Yes

0

1

0
6

Command

Rejecl

write Inhibit

A

Wri

te command received

with

the selected

drive

in

the

write inhibit

state

1

No

1 I

Invalid

Track

Format

Track

capacity

exceeded.

2 No

1

2 End

of

Cylinder

Cylincler

boundary

detected

duringa

basic multitrack

operation.

10 No

1
1

2

1

End

of Cylinder

Operation Incomplete

Cylincler

boundary

detected

during a basic overftow

ooeral.ion.

11 No

4

No Record Found

Programming

error

or expected

programming

error

condition.

The

searched data

does not exist

on that

trac

k.

z

No

5 F il'e Protected

The

Sr-'ek command

or

Read/Search

multitrack

ooeration

violated

f ile mask.

l2 No

I

1

5
7

File Protected

Operation Incomplete

A

Reard

or

Write

Overflow

ooeration

violated f ile

mask.

13 No

2 3

Environmental

Data

Present

Statisttical usage/error log information is

present

J Yes

Figure

ll. Error

Condition'lable

20

IBM

3340144 Reference

Manual

__

_:19f111"j't1r

Trl]i11

Action

Explanation

Print

message

1 for

operator

and/or

customer enqirreer

notification

2

Exit

witlr

programming

error

or unusual

condition indication

3

a.

o.

Repeat

the operation

one

time.

lf

the error

condition

persists, perform

Action

t.

4

a.

Repeat

the

operation.

b.

lf

the

error

condition

persists

after

ten

retries.

perform

Action 1

5

a.

lf

this is

a defective

track,

perform

Action

5A.

b.

Use address

of

defective

track

plus

1 in

a Seek commancl. The defective

track adclress

can

be for-rncl in

the

I D area of the record 0 count

area.

c. Resume

operation

after

searching

to desired

track

positron.

5A

a. Use

address of

alternate

track

in

a

Seek conrmand. The

alternate track

adclress

can be

founcl in

the

lD

area

of the

record

0

area.

b. Resume

operation

after searching

to desired

track

position.

6

a.

lssue

a

Recalibrate

comrrrand.

b. Seek

to

the original

address.

c.

Perform

Action

4.

7

a.

Perform

error

correction

function.

b.

Examine

bit 7 of the file mask. lf

this

bit

is

off,

go

to stel)

c. lf this bit

is on,

rcturn to user

with

indica,

tion that data has

been

corrected.

(User

is

operating

in

PCI

fetch

mode

and

mtrst,

therefore, suFrply

restart

recovery

action.)

Note:

Only applies

with

05/360.

c.

lf

the

user's

chain has not

been

completed, examine

the

next

non-TlC

command

in

the

user's

chain. lf bit

3 of this

command is

on

(count

area),

go

to step d.

lf bit is off

,

perform

Action

74.

Note: lf data

chaining is

indicated in

the interruptecl CCW,

the

prececling

tesr

/r{/sf

be

executecl

on the

first

non-TlC

CSW

after the

last

CCW in the

data chain.

d.

Continue

the

user's

chain by executing

the

following

CCW chain:

Seek

(same

as original)f

Set

File Mask

(same

as original)

Read

Home

Address

(skip

bit

on)

Search

lD Equal

(CCHHR

provided

in sense bytes 8-12)

Trc-

-8

TIC

(channel

status

word)

74.

Continue

the

user's

chain by executing

the

following

command chain:

Seek

(same

as original)t

Set

File Mask

(same

as

original)

Read

Home Address

(skip

bit

on)

Search

lD

Equal

(CCHHR

provided

in sense bytes

8-12)

Trc-

-8

Read

Count

(skip

bit on)

TIC

(channel

status word)

t Cylinder bytes

and

the high-order

head

byte

are obtainecl

frotn the user. The low-orcler

heacl

byte is obtainecl

from bits 3 through 7

of sense byte

6.

lrigurc

I 2. Recovcry

Aclion'fable

(

I ol 4)

Error Recovery Procedures

2l

Action

l--'---------

i

I

Set

File

Mask

Set

Sector

Search lD

Equal

TIC-

8

Restart

CCW

2

TIC

33,Ol33/,4 Recovery Action Table

(continued)

Explanation

a.

Perform

error

correction

function.

b'

Examine

bit

7 of the

file

mask.

lf

this

bit

is

off,

go

to

step c. lf

this brt is

on,

return

to user

with indica-

tron

that

data has

been

cotrected.

(User

is

operating

in PCI

fetch

mode

and must

supply resta!-r

recovery

action.)

Note:

Only applies

with

OS/360.

c lrrcrement

the

seek argument

by

one.

Cylinder

bytes

and

the high-order

head

byte

are obtained

from

the

user.

The low-order

head

byte

is

obtainecl

from

bits

3 through

7

of

sense

bvte

6.

d.

Construct

Restart

CCW

2.

e.

complete

the interrupted

operation

and

continue

the user's

chain

(if

appropriate)

by executing

tne

followi

ng

command

chain.

Seek (argument

from

step

c)l

b.

o.

(_).

(same

as original)

(argunrent

0)

(record

1

)

(channel

status

word)

lVote"

lf

the modified

seek

argument

is

not

within

the user's

extent,

then toS

must

supply the

corr&t

seek

argument

before

issuin.g

the

seek. tf

that

is impossible,

then tOS

must

perform

Action

2,

Perform

error

correction furrction.

Examine

bit

7

of the file

mask.

lf

this

bit

is

off,

go

to step

c. lf

this bit is

on,return

to

user

with indica-

taon

that

data has

been

corrected.

(User

is

operating

in

pCl

fetch

mode

and

must

supply restart

recovery

action).

Note:

Only

applies

with

03/360.

Use

address

of the defective

track

plus

1 in

the Seek command.

Construct

Restart

CCW

2.

Complete

the

interrupted

o;reration

and continue

the user's

chain

(if

appropriate)

by executing

the

following

command

charn.

Seek

(argument

from

step

c) t

Set

File

Mask

(same

as original)

Set Sector

(argument

0)

Search lD

Equal

(recorcl

l)

Trc-

-8

Restart

CCW

2

TIC (channel

status

word)

Note:

lf

the modified

seek

izrgument

is not

within

the user's extent,

then IOS

must

supply

the corrrct

seek

argument

before

issuinlT the

seek. lf

that

is impossibte,

then tOS

must

perform

Action

2.

8A

t

Cvlinder

bytes

and the high-order

head

byte

are

obtained from

the user.

The

low-order

head

bvte is

obtained

from

bits 3 through

7 of

sense

bvte

6.

lrigure

12.

Rccovery

Action

Tablc

(2

of 4)

22

IBM

3340144

Reference

Manual

33.0|33/,4

Recovery

Action Table

(continued)

Explanation

a.

lf

this

is

a

defective

track,

perform

Action

9A.

b.

Use

address of defective

track

plus

'!

in

a Seek command

and use

the

following

CCW chain

to

resume

ope rati

on.

Seek
Set

File

Mask

(same

as

original)

Set Sector

(argument

0)

Search lD

Equal

(record

1)

Trc-

-8

Restart

CCW

1

TIC

(channel

status

word)

Note: lf

the modifier

seek argument

is not

within the user's

extent,

then IOS must

supply the correct

seek argument

before

issuing

the

seek.

lf

that is

impossible,

then IOS

must

perform

Action

2,

a. Use address

of

alternate

track

in

Seek

command in

the

followinq

ccw chain

Seek

a'

Increment

the

cylinder

address

of the user's

seek argument

by one. Reset

the heacl

address.

b. Continue

the

operation

by executing

the

following

command

chain:

Seek
Set

File Mask

Set

Sector

Read

Home

Address

(skip

bit

On)

TIC

(channel

status

word

-

8)

Note:

lf the

modified

seek argument

is not

within the user'sextent.

then

tOS must

supply

the

correct

seek argument

before

issuing

the

seek.

lf

that

is

impossible,

then

tOS

must

perform

Action 2-

a.

Increment

the cylinder

address of

the user's

seek argument

by one. Reset

the head

address.

b.

Construct Restart

CCW 1.

c.

Complete

the interrupted

operation

and continue the user's

chain

(if

appropriate) by executing

rne

following

command

chain.

Set

File Mask

Set Sector

Search lD

Equal

Trc-

-8

Restart

CCW

1

TIC

Seek
Set

File

Mask

Set

Sector

(inhibit

seeks)

(argument

0)

(record

1)

(channel

status

word)

(argument

f

rom

step a)

(same

as original)

(argument

f

rom

step a)

(same

as original)

(argument

0)

Search

lD Equal

(record

1)

Trc-

-8

Restart

CCW

1

TIC

(channel

status word)

Note:

lf

the

tnodifiecl

seek arEtntent

is

not

within

the

user's

extent,

then

tOS

must

supply the correct

seek

argument before

issuing

the

seek.

lf

titat is itnpossible,

then IOS mu5t

perform

Action

2.

lrigurc

|2. Ilccovcrv

Aclion'I'utrlc

(3

til

4)

Error Recovery Procedures 23

a
hr

Deternrine

if the interrupted

command is

Continue

the operation

by executing

the

334013344

Recovery Action

Table

(continued)

Explanation

a Seek. lf

yes,

go

to step b.

lf no,

perform

Action

12A.

following

command chain

:

(same

as original)t

(same

;rs orrginal)

(argurnent

0)

(skip

bit

on)

(channr:l

status word)

Note: lf

the

seek argLtment is not

within

the user's extent,

then

IOS

must

supply

thecorrect

seek

argLilrlent before issuing

the

seek.

lf

that is impossible,

then

IOS mustperform Action

2.

This is

a mr-rltitrack

operation.

Increment

the user's

seek argument

by one.

Continue

the

or)eration

by

e:recuting

the

following

command

chain:

Seek
Set

File

Mask

Set Sector

Read Hornc

Acidress

TIC

Seek
Set

File

Mask

Set Sector

(argument

from

step

a)

(same

ars original)

(argument

0)

12A'

I

Read Horne

Acldrt:ss

{skip

bit on)

TIC

(channel

status word-8)

Note: lf

thernodifiedseekargurnentisnotwithintheuser'sextent,thenlOsmustsupplythecorrfft

seek

arllurnertt

before

issuingr

the

seek.

lf

that is impossible,

then

IOS must

perform

Action 2.

a.

Lr.

c.

lncrernent

thc Lrser's

seek arqument

by one.

Construct Restart

CCW 1.

Cornplr:te the

intcrrupted

operation

and continue

the

user's

chain

following

command

charn:

appropriate)

by executing the

Seek
Set

File

Mask

Set Sector

(argum,:nt

f rom

step a)

(same

as

original)

(argumrant

0I

Search lD Equal

(record

1

)

Search lD Equal

(record

0)

Tlc*--g

Restart

CCW 1

TIC

(channel

status

word)

Note:

lf

the

ntoclified

seek

arEttnent is

not

within the user

seek argttntetlt before

issuittgl

the

seek.

lf

that

is irnpossible

s

extent, then IOS

must supply

the

corrtrt

then

IOS must

perform

Action

2.

Message
Messalle 1

(shoulcl

a.

Message

Code.

printed

on

all

p,ermanent

errors).

b.

Error

tvpe

(read,

write, or control).

c. Moclule designation, cylinder number,

and

head

number

(that

is, device address

and

seek address).
d. Cfrannel designation.
e.

Stalus and sense

bytes

to CPLJ

I

Cylinder

bytes and the

high-orde:r

head

byte

are obtained

from

the

user. The low-order

head byte

is

obtained

f ron

bits 3 through

7 of sense byte

6:.

I

rgtire I l. Ile eovt rr'

.,\e

lirrrr

{rrlrlr

14

ol

.1)

24

IBM

-1340i 44

Rel-erence

Manual

"I'he

command set used

to

perform

operations

with

the

3340i3344 is as follorvs:

SENSE

COMMANDS

o

Sense

I/O Type

o

Serrse I/o

o

Read and Reset

Buffered Log

o

Test l/O

r

Read Diagnostic

Status

CONTROI, COMN,IANDS
o

No

Operation

o

Seek

o

Scek Cylinder

o

Seek

Heacl

o

Recalibrate

r

Restorc

(t:xecuted

as a No

Opcration)

o

Set

File N,Iask

o

Space Count

o

Set

Sector

e

Diagnostic [-oad

o

Diagnostic Write

o

Device Release

o

Di:vicc Reserve

For nrore

cletailcd

information

on the commancls, refer

to the

ISC

ancl 3tt30-2

reference

mernuals. Each of

the

comnrancls is briefly sunrmarized in thc

charts

on

the

f ollowing

pa!r.cs.

Pagc

,rl

(iA2(r'

l('

l9-'l

ll

i

Yill-

I l'.1 ii;i;,

I

ill

CHANNEL COMMANDS

READ COMMANDS

r

Read Data

e

Rcacl Key

and Data

o

Read

Courrt,

Key,

and Drta

o

Read Multiple

Count,

Kcv, and Data

r

Read l{ome

Address

o

Rc'ad

Count

o

Reacl

Initial

Progranr l.oad

o

Read Sector

o

Rcad Record Zero

WRITE

COMMANDS

o

Write Data

o

Writc Key

ancl

Data

o

Write Clount. Ke-y, irnd

Data

o

Write Home Adclress
o Write Record Zero
r

Write

Special Count.

Key, ancl

Data

o

Erase

SEARCH

COIlI]VIANDS

o

Search

lD Eclual

o

Search

Key L:qual

r

Search

l{omc Aclclress F,(lual

o

Serarch

Il) t{igh

o

Scarch

Key High

o

Scarch lD L:.qual or

l{igh

o

Search

Key Equal or

lliglt

(

ltlrrtrrel

(

r,111111.111i.

25

Pagc

of

C,4,26- l6l9-.1

Revised

Mav

26, 1976

By

TNL:

C

N26-0321t

SENSE COMMANDS

Command

Code Function

Data Transferred

Across

Channel

Single
Track

Multi
track

Sense

l/Cr Type

E4

Transfers

seven bytes of sense data designating storage

control type, drive type, and data module

size

(3340

onlv).

7 bytes

of storage con-

trol

and drive

identifica-

tron.

Test l/O

00

Determines

status of

device

on

a channel. Generated

automatically

by channel

when status

information
reouired.
Note:

Test I

/O

is not a 3340 / 3344 command but

a

systern command similiar to start

l/O.

Command

code

(0000

0000) not written by

programmer.

One status byte.

Sense l/Ct

o4

Determines

cause of

last

unit check. Sense

data is

reset

after transfer.

24 bytes of sense

in-

f ormation.

Read and Reset

Buffered Log A4

Supplies usage or error

logging data

on

the addressed

drive.

Data is reset

uoon

transfer.

24 bytes

of

usage

or er-

ror logging data.

Diagnostir;

Sense

44

Determines

type of error(s)

found when running diag-

nostic test

(part

of

Diagnostic Write)

or

transfers

test to

system after a Diagnostic Load.

Note: lf command not

preceded

by DiagnosticWrite

or

Diagnostic

Load, 16 bytes of

data from error code

message

are transf erred.

1 6 bytes

of error code
message
or
51 2 bytes

of

test data.

26

31.10,/33.1'+

Referencc Manual

Command

Code

Function

Data Transferred
Across

Channel

No

Operation

03 No action. Channel

End and

Device

End

are

presented

during

initial status.

None

Seek

07 1. Selects drive.

2.

Moves the access to the

cylinder

specified by the

seek

address.

3. Selects the

head

specified

by the

seek address.

Seek address

(six

bytes)

Seek Cylinder

OB

Space Count OF

When chained from a

Read,

Search,

Write

or

Space Count

command, this command

locates the start of the

next count

area

(including

R0),

spaces

over

the count area,

and ends

with Channel

End

and

Device

End in the

gap

before the

Key

area.
When

not chained,

Space

Count searches

for

index,

clocks

over

gap

1.

Home

address,

gap

2, and spaces

over

R0 count.

Operation ends in the

gap

following the

R0 count with

Channel

End

and Device

End.

Three bytes

used as

Key

Length

(one

byte)

and

Data

Length

(two

bytes)

for the

next command.

Recalibrate

13 Moves the

access

to

cylinder 0 and

select

head 0.

None

Restore

t7 No action. Zero

initial status

is followed

by

final status

of

Channel

End

and Device

End.

Seek

Head

1B Selects the head specified

by the seek

address.

Six address

bytes. Only

the

five low-order

bits

of

the sixth

byte are

used

for the seek

address.

Set

File Mask

1F Sets

file mask to indicate

permitted

Write, Seek,

and

diagnostic

commands.

One

byte of

file

mask

data.

Set

Sector

23

Used

on disconnected

command

chaining

channels

to

eliminate

the need for the channel

to

maintain

connection

with

the

storage

control while

waiting

for the selected

record to

reach

the

head.

Note:

lf the RPS

feature is

not installed

on

the addressed

3340,

this

command

returns Channel

End

and Device

End

together

in

final

status. No operation

is

performed

and track

orientation

is destroyed.

All 3344 units

have

RPS.

One

byte specifies

angular

track

position

(0-63)

CONTROL COMMANDS

Control

Commands

27

Control

Gommands

(Continued)

Command

Code

Function

Data Transferred

Across

Channel

Diagnostic

Load

53

Transfers

the specified

512-byte

block

from

the

read-only

storage

to

the control

storage

buffer.

One byte

of control

information

addresses

one sector

on the

23FD.

Diagnostic

Write

73

Transfers

an inline

test

from

the main

storage

to srorage

control

and

executes

the

test.

A 16-byte

error code

message

is

stored

in

the

storage

control

buffer

area. A

subsequent

Diagnostic

Sense

command

transfers

the

error

code

message

to

main

storage;

requires

a

special

file

mask.

A

maximum

of

512

bytes.

Device

Release

94

Terminates

the reservation

of

the

addressed

device.

Only

available

f.r

two

channel

switch,

two

channel

switch

additional,

or string

svyitch

feature

machines.

Twenty-four

sense

bytes.

Device

Reserve

B4

Reserves

the

addressed

device

for

exclusive

,r" *i*

,.ilctil

is

made.

Only

available

for

two

channel

switch,

two channel

switch

additional,

or

string

switch feature

machines.

Twenty-four

sense

bytes.

28 IBM3340l4y'.

Reference

Manual

READ COMMANDS

Command

Code

Function

Data

Read

Single

Track

Multi­track

Read lnitial

Program Load

(See

Note 1l

02

Recalibrates

to

cylinder

0 and head

0, searches

for

index

point,

and

reads

R1 data

from the

drive to

main

storage.

First data area

after

R0.

Read Data 06

86

Transfers

data area

of a

record

from

drive

to

main

storage.

First

data area after

address

marker

or

the data area

of the

record that was

chained from the

count

or key

area

of the

same

record.

Read

Key

and

Data

{See

Note

2)

OE 8E

Transfers key and data

areas of

a record

from drive

to

main storage.

First

key and data

area after

address

marker

or the key

and data

area that
was command
chained

from the

count area

of the

same

record.

Read Count 12

92

Transfers

next

count

area

(8

bytes)

from

the

drive

to main storage.

Next

record

count

area

or

first count

area after

R0.

Read Record

Zero

(ROl

(See

Note 3)

16

96

Transfers

R0

(count,

key,

and

data)

from

the

drive to

main

storage.

Record 0.

Note l: A Read

IPL command cannot be

prcceded

by

a

*t

File Mask command

in

the

sme

chain.

Note

2: lf

the

KL

quals

0, the command

is

executed

the sne

as a Red

Daa

command.

Note

3: When

chained

from a Search

HA

or Read

HA

command,

the Read

R0

command

is

executed

immediately

and does

not initiate

a earch

for

index

point.

Read

Commands

29

Read

Commands

(Continued)

Command

Code

Function

Data

Read

Single

Track

Multi
track

Read

Home

Address

IA

9A

Transfers

five

bytes

(FCCHH)

to channel.

Transfers

count,

key,

and data

areas of

a record

from

drive

to

main

storage.

Byte

0

=

Flag

Byte

1

=

Cylinder

address

Byte

2

=

Cylinder

address
Byte3=0
Byte 4

=

Head

address

Read

Count,

Key,

and Data

1E

9E

Next

record

or first

record

after

R0.

Read

Sector

(See

Note

4)

22

Provides

one

byte

of angular

position

information

which

is used

by

a subsequent

Set Sector

command.

Whren

not

chained

from

a Read,

Write.

or

Search

CCW,

the

byte

transferred

is

the

angular

position

required

to

access

the last record

processed

on the

drive.

When

chained,

the

byte transferred

is

the

angular

position

of the

record

used

in

the

previous

CCW.

Read

Multiple

Count,

Key,

and
Data
(See

Note

5)

5E

Transfers

remaining

records

on

a track

to

the

channet.

In

use,

this

command

is

the

same

as a

series

of Read,

Count,

Key,

and

Data

commands.

Since

the number

of

byttes

is

unknown,

CCW

count

should

be larger

than

the

longest

track

length.

Use the

SlLl

bit to

suppress

incorrect

length

indication.

Starts

at count

f ield

of next

record

(except

ROl

Note

4:

Caures

loss

of orientation.

Note

5:

Command

Retry

works

only

on single

records,

so certain

types

of

errors

cannot

be

retried.

(The

Read

Multiple

Count,

Key,

and

Data

command

is

supported

on 3830-2,

lFA,

and tSt)

with

334O/33/M

configurations.

)

30 lBM334Ol44

Reference

Manual

WRITE

COMMANDS

Note l: Same

as Write Count,

Key, and Data. Not

used

Note

4:

The CU

skips

writing

an

address

marker, sync

for

last

segment

of an overflow

record.

byte,

or

ECC.

Note

2: lf

file mask is

violated, set

Command

Reject.

Note 5:

Same

as

Write Count,

Key,

and

Data

except it

Must be

chained

from a successful

Search

lD

must be

chained

from

a Write HA

or a

Equal

or

Search

Key Equal command.

successful Search

HA

Equal command.

Note

3: lf

file mask is

violated, set

Command

Beiect.

Must be chained

from a successful Search

lD

Equal

command.

lf KL

:0,

operation

is

the same as Write

Data.

Command

Code

Function

Data Written

Single
Track

Multi-

track

Write Special
Count, Key, and
Data

(See

Note

'l

)

01

Same as Write Count,

Key, and

Data command except

a

1 is written in bit

4 of the

flag byte to

indicate

a

record overf

low

segment.

Same

as

Write

Count,

Key, and

Data.

Write

Data

(See

Note 2)

05

Changes

the data

area

of a

record.

Data

from

the sYstem.

Writes

the

number

of

bytes

specified

by the

DLDL bytes

of

the

count area

of the

same

record.

Write Key and

Data

(See

Note 3)

OD

Changes

the

key

and

data

areas of a

record.

Data

from the system.

Writes

the

number

of

bytes specified

by

the

KL and

DLDL

bytes of

the count area

of

the

same record.

Erase
(See

Note

4)

1'l Operates

exactly

like a

Write Count,

Key,

and

Data

command except

that data

from the

channel

is

not

written on the

track,

Bytes of 0s

to

end of

track.

Write Record

Zero
(R0)
(See

Note 5)

15

Writes count,

key,

and

data

areas

of

R0'

Flag byte

from

HA area.

CCHHRKLDLDL

from

system written

in

count area.

Key

and data

from

system.

Write Commands

3l

Write

Commands

(Continued)

Command

Code

Function

Data

Written

Single

Track

Multi­track

Write

Home

Address

(HA)

(See

Note

6)

19

Writes

the

7-byte

(SDFCCHH)

home

address

area

on

the

selected

drive

and

track.

The

7-byte

(SDFCCHH)

home

address

area

transferred

from

the

system.

Write

Count,

Key

and Data

(See

Note

7)

1D

Writes

one

complete

record

on

the

selected

drive

and

track.

Count,

key,

and data

areas

of next

record

on

the

track.

Data for

the

areas

comes

from

the

system.

The

count

area

flag

byte, ECC,

and

gap

data

come from

storage

control.

Note

6: Must

be

chained

from

a

stisfied

Search

HA

(witn

the

CCW

count

area

of four

or more)

if defective

bit

(ftag

byte,

bit

il

is

off.

lf not

chained

from

a

stisfied

Sarch

HA,

defective

bit

must

be on.

Note

7: lf

file

mask

is violated,

et Command

Reject.

Must

be

chained

from

Write

R0;

Write

Count,

Key,

and

Data;

Erase;

a successful

Search

lD

Equal;

or

Search

Key

Equat

command.

After

last

Count,

Key,

and

Data

command

on

a

tack,

vwite

(h

tu index.

32

IBM

3340144

Reference

Manual

Command

Code

Function

Data

Compared

Single
Track

Multi­track

Search

Key

Equal

(See

Note

'l

)

29

A9

Locates

a

key area

selected

bY

the

system.

The

key

area

bytes

from

the

selected

drive and

track

with data

from

the

system.

Search

lD

Equal

31

B1

Locates

a

count

area

selected

by

the system.

Five

bytes

(CCHHR)

of the

next count

area

from the

selected

drive

and

track

with CCHHR

from the

system.

Search

Home

Address

Equal

39

B9

Locates

a

home

address

area

selected

by

the

system.

Four

bytes

(CCHH)

of

home

address

area

from the selected

drive

and

track

with

CCHH

from the

system.

Search

Key

High

(See

Note 2)

49

c9

Locates

a

key area

selected

bY

the system.

The

key area

bytes

from

the selected

drive

and

track

with data

from the

system.

Search

lD

High

(See

Note 3)

51

D1

Locates a count area

selected

by

the system.

Five bytes

(CCHHR)

of the

next count

area

from

the

selected

drive and

track

with

CCHHR

from

the

system.

Search

Key

Equal

or

High

(See

Note

4)

69

E9

Locates

a

key

area

selected

bY

the system.

The

key area

bytes

from the

selected

drive

and

track

with

the key

area

from

the system.

Search

lD

Equal

or

High

(See

Note 5)

7'l

F'l

Locates

a

count

area

selected

by the

system.

Five

bytes

(CCHHR)

of

the

next

count

area

from the

selected

drive

and

track

with

CCHHR

from the

system.

SEARCH

COMMANDS

Note

|

:

The

key

area

compared

is the

key

area

of the

Note

3: Locates

any

tD

f rom the

track

that

is

higher

nextrecord(exctudingB0),unlesschainedfromthanthelDfromthesYstem.

a Read

Count

or Search

lD

commmd.

lf

Nolr-

4: Same

as Search

Key

Equal

except

the

key

area

chained

from a Count

operation,

dte

key

area

bcated

is equal

to

or

higher

than

the key area

searched

is in the

sme

record.

from

the

sYstem.

Note

2: Same

as Search

Key

Egual

except

the

key

area

Note

5:

Locates

the

lD

from the

track

iltat

is

equal

to

or

is located

in

any

key

area

on the

track

that is

hidter

than

the

lD

from the

system.

higher

than

the

key

area

from the

system.

Search

Commands

33

SENSE

DATA

The

status

and

condition

of

the

3340/33441is

reported

inJhe

sense

bytes.

There

are

24

bytes

and

seven

different

formats,

G-6.

Four

formats,

l,

4,

5,

and

6

describe

the

disk

storage

condition.

The

remaining

three

formats,

0,

2,

and

3

are

associated

with

the

ltoragg

control.

Only

the

formats

dealing

rvith

rhe

3-340/3344

are

explained

in

this

publicatior:r.

Refer

to

the

ISC

and

3830-2

reference

manuals

for

lformats

0,

2,3,

and

a detailed

description

of

Unit

Status.

Some

sense

byte

formats

may

vary

for

the

clifferent

attachment

methods.

Therefore,

ine

SlqO/n44

user

should

also

order

companion

manuals

in

order

to

have

a

complete

set

of

sense

byte

information.

l.he

follow_

ing

manuals

are

recommended

for

System/l}70

Models

l15,125,

and

135

users:

o

IBM

System/37|

Model

II5

Functional

Characteristics,

Order

No.

GA33_l

5 10.

o

IBM

System/37|

Model

125

Functional

C

haracteristics,

Order

No.

GA33_

I

506.

o

IBM

System/37|

Modet

135

Functional

C

haracteristics,

Order

No.

GA33_3005.

Sense

Byte

Summary

In

all

the

formats,

the

first

eight

bytes,

0-7,

give

high-level

information

conceiningstatus

and

condi_

tion.

Sense

byte

7 identifies

the

format

in

which

the

remaining

bytes,

8 through

24,

are

arrayed:

r Bits

0

3

=

The

furrnat

array

of

bytes

g*24

0

1

2

3

Format

0
0
0
0

0

1
1

1

0
0
0

1

1

0

1

0

1
4
5

b

7

r Bits

4-,7

=

Define

a messaqe

Byte

Each-of

the formats

1,

4,

5,

and

6

(including

the

possible

messages)

is

summarized

in

the

charts

on

the

following

pages.

4

5

6 7

Message

0

I

0

1

0

101

0

F

34

IBM334Ol44

Reference

Manual

Prge

ol

CiA26- l6l9--1

Rcvised

Mav

26, 1976

By

I NL:

CiN2(r-012t

3340/3344

SENSE

BYTE 0 throush 7 SUMMARY

Bit 0

1 2 3

4

5

6

7

--t

- -l

Byte 0

Command
Reject

lnter­vention Re­quired

Channel

Bus Out
Parity

Equipment
Check

Data Check Overrun

Track j Seek

Condition

lCheck

Check

I

Byte

1

Permanent
Error*

Invalid

Track

Format

End

of

Cylinder

Not

Used

No Record
Found

File
Protected

Write

iOperation

Inhibited

llncomplete

l(See

Bvte

Byte 2

RPS
Present

Correctable
Data Error

Not Used Environ-

mental

Data

Pre-

sent

3344
Drive

Data Storase

T.ype

i

-r-]--

l

3sMB |

,o*,

I

Data

r\4o-

|

oata,r"

|

*?l#'n

oure I oute

,;;;:

|

",

rio

I

f."ifi?

I

'010'

I

Byte 3

Restart

Restart command

(provided

onlv

when byte

1, bit 7

is

on)

'06'

:

Read ooeration;

'05'

:

Write operation

Byte

4

3340

Drive
ldentif icatiorr

Drive A

Drive B Drive C

Drive

D

Drive

E

Drive

F

Drive G

Drive

H

Byte 4

3344

Drive
ldentif ication

Controller

Address Bits

z 1

Not Used Not

Used

Not Used

Phvsical

Drive

Address

Bit4

|

aitz

i

Bitl

_t__l_

Byte

5**
Cylinder
Address

Low-order

Logical

Cylinder

Address

128164|32IroI8I4I2|I

Byte 6*t

Cylinder

/'T'rack

Address

Not Used

High-order Logical

Cylinder

Address

512125612048***

Logical

Head

Address

8

+ 2

Byte 7

Format/
Message

Format

Message

Code

*Set

by

Error Recovery

Procedures.

**lf

seek check

active

(byte

0, bit

7), bytes 5 and 6 contain

the

last

seek

***CE

<;ylinders

posted

as

2800

through 2804

which results

in bits

1 and

3

These

are added

together

to equal

the

number

of

the CE cylinder.

argument

(address)

issued

to

the device.

being set,

plus

the

additional

bits

in byte 5.

Scnse

Data

35

[)rgc

of

GA26-1619-:1

I{cvise

d lllrr1-

26.

l()7(r

Br.''l

NL:

(;N26-0l2li

3340

FORMAT

1 SENSIT BYTE

SUMMARY

,B;i;t

__----F;nlrotter

iDevic,r

io,iu"

--Tnead
lonrin" iot

lar.u

lseet

comptl

l3:l::^ icheck IIJ::l:'"" lctreck lyJr: I iAttention i ]3::n3":::'l

lstatus I

lcrrect<

!

jorect

I I I lPadcompr

I

i---..-.-_-r_--.-'-__|__-.'-.T--t

lByte

9

IDM

JSector

lMotor

at

lAir/Belt lyvritg lFixed

Head

lDara

Mo-

lData

Mo-

|

lChecks lloaded lCompare lSpeed lSwitch lEnable lData

N/lo-

lOule ldule i

lStattrs

lSwitch lCheck lSwitch llatched I ldule lSize

2

lSize

1

I

It,..^r^r I l, ---,,--' | | ln,--

"

1 rn rr,- I or rr' I

lChecks lloaded lCompare lSpeed lSwitch

lEnable

lData

N/lo-

ldule

jdule

i

lStattrs

lSwitch lCheck lSwitch llatched I ldule lSize

2

lSize

1

I

Larched

i llatched

I

I lSize

+

l-

zo rvu

-35

Mb

I

L

_

+

__+__

r____-,_,_f_

l_

_

+___-__

l

_____+____-

iByte

10

IDM

Size

lData

joata

loata lCheck lovt

Seo.

lBias lodd I

IDM

Sequc'nce

lCheck

lModule

lModule lModule llatch

lCheck

lDisable

lPhysical

I

l!,:t-.1

-- -- t ---- -L*qt

i.*:l

I --]Latch

1

1

- -[g'"13-1--ft*r"-l---1l*

1

i_

___ __ ___1______, --+

f______

__j

+

__ _t __ ___

+

layt"

r 1

lorive lor E;,.--]DM IDM

-F
B"[--p;;s;-lvro,o'

lload

Switch

lStart lPreserrt

jLocked

lUnloaded lloaded lSwitch lHome lSpeed

ll'l'"1 _ _ F_YII_ _

l_s*'rl

l9ryr{ llyr9t _lswrtch _i___ | lsw

tcrr

Fr*it-

----J*..,,r'o'"
lcapabte/ [r*"

__*--1,".*

-lR;;d^r/..*la;";.r

tnr,*

iwn,u

l---r

_-l

iLcr(wrrT lLorurra lLoLUrr

|

| |

i

-.---_-,..---+

+______

,_+

I

-- -! __ ---+

I

Drive

loru lcouer lorrl lolt lRir/aett lcarriage lMotor

at

I

lBvte

15*

i

irll^i.^i, .r.,u^"" I

Control Interface

Tag Bus

(at

time

error

was detected).

I

(Valid

only

for

message

codes

1, 3, 5, 6, 7, 8, and

9")

lTag

Bus

i

ler*

i6

-Jn.""*--lo;h;;alil;oir
F'.*

­la;;--[-"-*

-[c".*r

iAccess

iTrnre

Out

lCheck

lTrack

ChecklCrossing

llatch

lMode

Latch

llatch

jeyte

tZ

jvtuttipte jCapable/

lwr,t"

jrnoer

lRead/Write lControl

iwrite

lwrrte

lRead

/Write

]Head lEnabl,:

lOverrun

lCheck lWrite lCheck lTransition

jCurrent

jSaf ety

lSelect lCheck I ] llnterlock ] iCheck lDurins

I lcheei____

l_

I _ _L

]ggl_l__r_

lry:ttl_

lByte

13*

]

Contrrf,l Interface Bus

Out

I

e xpected

Drrve

Status

lControl

lrterface

I

(for

messaqe code

C).

i

Data valid

for message

codes

lBus

Out

I I

1, 3, 5, 6,

7,

8,

and 9.

tl

lPyt: lll . ,

i

aontrot Interface

Bus ln

(at

time error

was detected).

iLonlrol

lrrlerrace

I

(Valid

only for

message

codes

1, 3, 5, 6,

7,

8, and

9.)

iels

ln

I __

iByte

15*

i -^^+-^r r-+^-{^^.- T-^ o..^ /^+ +i-^ ^.-^-.^,^^ i^+^^+^-r\

s*';oir

1i'.*

Track

Check

lCrossing

ch iMode

Latch

ilatch

jAccess
lStatus

f---

- -

lBvte

17

iController

lstatusluheck.iillllil

F*;; lFLo - lN;plo--IGRDES ]o.-- lw,*-

-lvr"*;__-F­le-c

-i

IController

lCheck llnput lCheck lCounter lData lCheck lCheck iZero ]

[,hl:!:

_+

]!l::l:

__

i_

_ __

l9lT-

__lg"e!___L

,_

L_ lq"'"e'"'j

l

inytets

I

I

i | |

i

i*:::l::,,;:*" I

Unusecl I unuseo

I

unuseo

I

unuseo

I

..dec

Error condition

(bits

4

tlirouqh 7)

lO

,li

l

t

-------- - -

-;-------]_-

+--+----+

iRwfe 19 lSpt R/\A/ lRpqervpd iReqenrcd lRpqerrrpd I ll o Gai. l-- Tfl""d-fl"* l

tv'_::a::

_:"

"'-

_f____ _- _

]__

,a;;".""" *;;"*"

l

iByte

19

lSet

R/W

lReserved lReserved lReserved I lLo

Gain

1

lFixe

lstatrslonlllllErrorliFeaturei

I l1.:"Bu,"J)l I | _i_____i

___i_

1_____j

I

---------

-

t

------

­T

i

lBvte

20

lControl lControl lDrive

jDevice

lControl ll

Wrrte

lDevrce lDevtct: i

itnier+ace

llnturfu"*

llnterface

Iselection iBus

In

llnterface lFailrre lBus

out

lr.g i

evice

]D

evict--

|

us Out

,Tag In

arrty ChecklParrty

v

'I

_

t:l'::l

i

-t-^

I

'T''--'-

lLo

Gain

I lFixed

Hear

lError

I iFeature

rli

- --- --+

---+ -

+

r

--,----L.1..-'

rli

____l.,rllyr!lg*-co_1_"

_

_ l

*

These

l)ytes are also

valrrl for message

code 2 when byte

18

equals

1, 3, 5, 6, or E.

Note:

A,

B. C, and D

ref

er to bytes; on the f otlowing

page.

Pag,.:

ol

(l,\2{,

l6

!Li-+

Rcvisctl !lal

16. l(r?(r

Llv lNL:

(;Nl(' (!Jlti

A tt

busy

(bit

13

on), Search

Sectoi-is

in

progress.

lf

set

read/write is

on

(byte

19,

brt 0

:

1),

byte 8

is:

llo

i

- -

12

l:

',0

'---5

'u

-i,

ljController

jDrive

lnter'

lDrrve

Ctreck

lReati/Write

lOn

Li'r" ilWrite

Sense

llndex

Mark

lAt;trve

i

l

lcnecl if

ace cfreck

i

io',u"i<

i

,

I

iTl,r,:r

B Wrtfr seek

c;heck on

(byte

0, bit 7), bytes 13

and 14 indicate:

lC

tf

seet check is on

{byte

O bit 7) and format 1

rnessage

A,

then bytes 20 and 2l

indicate

lo

i''

-i,-­I' E- lo

l-11-l"li

I

Present

Segk

Address

')')

| 14

i0

i

I

Logrcal Head Address

lqizi

l.

I

i

1

li

Ct

lUnuscri

iJ

iReDet,t've

cornmaric overruns

orl G i operirtrorrs.

|l

r'-T
|

1 jit'io fag valro on read/write

operation.

I

I

lL3usy

rnrssrnq

after seek

staft

issued.

I r r

i--

|.jNon<-lrnraitlrc}reckenrjonread/Wr|teorECU

1t ,A

i I

operal

rurrs

I

r'

'

I

I i

3

I

No

response

l'ronr drrve

on

control

operation.

I

A Urrr-rsed

D Mi,:noprogriirn

efror

messages

tsense

rryre 18,

trrts 4 trrroir3ii 7).

lr

4

j1-irrre

out waitirrg f or index

or

actrvLj Lrlck

r

C Unuseci

1

--

I

b

:L(;(.

l,irru',u.r,e

.;rreci<

I

tl

_.t-.t1rt.st:d

tl

6

iVlultrr.,le

()r

no conr,ruller selei:te,J.

I

I

rUnuserl.

l-

7

iPresrlectiorr

check.

I

f

Attentrorr check.

L..

Scttsr'

| )lrll

l)agc

ol

(i.,\,1,6-

|

(r

I

9-.1

l(cviserl

'rvlIlv

2(r.

I97(r

Uv

-[
N L:

(;N26-0321t

3344 FORMAT

I

SENSE BYTE

ISUMMARY

Latched

arget
elocrtv

oTor aI

otor

at

u

rrent

ontrol

lWrite lwrite

Exoected Drive

Status

Data valid for message

codes

1.

3, 5. 6. 7. 8. and 9.

HDA

Sequence

Latch 4

Transition

nte

Data ECC Hdwe

4-tldition

Ibits

Unused

lDevic,a lDrive lRead lOnline IHDA ll
llnterf

ace

lCheck lWrite I lAttention I

lcheck. llchecklll

1s"",". fv"n"'.r ln"

s*i."r'

ffi

-|F"=d
F1"Jl

lCompare lSpeed llatched lEnable lH

DA

lt

lCheck. lSwitch I I ltnstatted I
lllatchedllll

-IH-DA

--|HDA

-]nDA --|HDA
s"+-f"n*

I

lSequence lSequence lSequence lCheck lH

DA

I

lLatch 4 llatch

2

lLatcrr t lLatcn lRecycte ]

t,"d

-li;*s--

--li'..k -m-]i

lBand ]Velocity lCrossing I lSwitch I
lPatternlllll

l-. r,t,r"

l-ffi

o"H.

---Fc""i," -]i

lEnabl,e louetrrn lcnect ll

write

lcrrect< I

lcheck,

lllcheckil,

L_

__,-L

___1, _ __

l_L

L

Control Interface

Bus

Out

I

Expected D

(for

messase

code C).

|

""t",:i't:::

;

-_--*-.
**"

;;;;"

",,",

-.*",*"*

_ ___*_Y1onrv

for message

codes

1'

3' 5' 6' 7'

8'111i

Control Interface Tag

Bus

(at

time

error

was

detected)

(Valid

only for

message

codes 1, 3, 5, 6, 7,

8,

and

9.)

_"To**n.",

ls*'"-[n"*- ls**

-|L,n"*
l,

lCheck: lOtt

rract

lvooe

Latcn

lLatcrr

lvooe

t-atcr'

lt

-1

_--l----l--

I-

f f

lrtr"

eLo

-lsER;f
G.p

C*I[w'* Data

]Monitor lr

_l'*,,

__

lcnecr

pheck

lcheck

l9lg9* I

-l*,*"
l;*

[",*

--T--

I i | |

codedErrorcon

tttl

-fu"d-lu"r*d

lu'**d

TH"uo--]u""*d I

r

rk

lBvt.8

fcont,.otte'

]Drive ]Check

Status

I

tBy..9

1--

-

Checks

i

Status

i

li

[*r."

, o

I

lH

DA

Sequence

I

lControl i
jByte

11

lDrrve

ll-oad

Switch

lStart

lstatus

lSwitch

,tr.;1t

livrrrripr"

'flead

/Wrrte

lchip

lSafety

lSelect

Chk

tl

l-

iByte

13*

|

rControl

l'face

i

lBus

Out

I

lenr.

iq"

_-l-

rControl

t'face

i

jBus

In

I

lByte

15'

-­I

Control

l'face

I

irag

t'us

I

f

----­1

iByte

16

lAccess

lAccess

lTime

Out

lStatus

__

|

leyte

t 7

lPLo

jController

Chks

lCheck

ev* 18

lunrr.o

]Microprograrn ]
lDetected

Errors

I

[r."

is--

- - *-­1s",

R7w

]Status

]On
l(see

Bvte

8)

yte

20

rterTacLr

ecks

tro I

I nterface

Tag Bus

arity Chk

trol

nterf iace

us

Ctut

arity Chk

Device
Bus

Out

Parity

Check

Device

ag

Parity

heck

ailure

ontrol

n itia Iize

I nterface
Bus In
Parity Chk

rre

ldentity

(one-of-eight

code)

lP'

]r

rlr

lch

I

Physical

Drrve

izl

iBytes

22 and 23

l_

Fault Symptom Code

*

These.bytesarealsovalid{ormessar;ecode2whenbyte18equals1,3,5,6,7,8,or9

Note: A,

B,

C,

and D ref

er to bytei-on

the

fotlowing page.

lByte

2x

iDevice

-18 -1340/ll;1"+ I{elelencc

N,lanual

pr

rCSS

Set read/wnte

tS

on

(byte

19,

btt 0 : 1),

byte 8 is

0

Controller
Checks

1

Device

Inter-

face

Check

2

Drive

Check

a
Read

/

Write

Check

4

On

Line

5
lWrite

Sense

o

lndex

Mark

7
Active
Track

tty INL:

LrNlb-(l-1lX

A tt Uusv

(bit

6 on),

Search

Sector

tf

B With

seek check

on

(byte

0, bit 7),

bytes

13

and 14 indicate:

1

4

c

lo

Previous

SeekAddress

(access

position

before

present

seek.bytes

5 and

6) Low Physical

Cylinder*

128

64

16

Clf

seekchec:kison(byte0,bit7)

andFormatl

messageA,thenbytes20

and21 indicate:

4

8

32

128

64

Present

S

32

Address

(low

physical

cylinder,address*)

16

I

8

|

q

High Physical

Cylinder*

512

256

D Microprogram

error messages

(sense

byte

18, bits 4-7).

*Forfixed

head

tracks,

both

cylinder 512

and

cylinder 256

bits are

equal

to

1, and the

cylinder

low

bit 7

should be

interpreted

as

the

head

'

64'

bit. cvlinder

low

bits 0 throuoh

6 are eoual to 0.

High Physical

Cylinder

Physical

Track

Address

Phvsical Track

Address

0 Unused

8 Repetitive

command

overruns

on G1 operations.

1

No Tag valid

on

read/write

operation.

9 Busy missing

after

seek start

is

issued

2

No

norrnal

or

check end

on

readlwrite

or ECC

ooeratNons.

A

lncorrect

drive

selected. Actual received

physical

drive lD

contained in

byte

14

(one-of-eight

code).

No response

f rom

drive

on control

ooeration.

B Unused.

A

Time

out

waiting

for index

or active

track.

(-

Unused.

6

ECC

hardware

check.

D

Unused.

Multiple

or

no

controller

selected.

E

Unused.

7

Preselection

check.

r

Attention

check

(unresetable

interrupt).

Serrse Datlr

39

Pagc

of

Gr\26- l6l9--1

Rcvisccl I\1ar'

26.

l()76

tlv'f

NL:

(1N26-0i2tt

3310/3344

FORMAT

MESSAGES

(Sense

Byte 7)

Message

FORMAT

1 FORMAT

4

Number

No message HA f reld

data

check

FORMAT 5

Not used

Transmit

targel error

Mrcroprogram

detected

errors

(See

byte

18)

I

I

Not used

I

Courrt

f ield

data

check

Key f ield

data check

I lUnexpected

drive

J

No

sync

byte

i f

I

5

I

status

at

I

in

count area

I I

I linitial

selection

I

|

|

--4-_-_|­I ]Transmit lNo

srync

byte

I

I

I

6

lcylrnder

error

lin

kery area

i

i

I

---l(strrngt*'t"Tnlt)

;

--

'

-

j

t

-- -i-*-n;.
l*;;;*" 1 l

trming error

lin

Hr\ area

I |

|

rarlsllllL lleau

ll\u

|;YIIU

uytc

I

\

lerror

lin

data area

i

I

r

Jerror

Transmit:

(3340)

lData

f ield

- ltixeo

head error

lrnco,rrectable

i

_____ __f_

r

,

iTra.nsmit

iNot

used

|

|

I ldrlterence

error

I

I

I

i

-----f.

--

,':,-- J* .

------l--

-__--

i

---- -f

-- - ---

J-

------l--

-----

i iUnexpected

f rle

lNot

used

I

I

I

g

lstatusdurins i

i

I

I iRead|Plorretry L I

I iRead

IPL

or

retry

l- E;

*..,ti..*"

i

A

I

check

i

n

lcheck

I

i I

I lon

physrcal

address

I

I

I

l

----

I

----

j

L lseek

incomplete or

]

|

I

sector

compare

,

]

I

i-

- ---i

-*---

I

--r-

--

-

-.---r

i ^ lNornterrupt

I

i i

li:i':",:::o' I

I

I

trom onve

I I

-1--r---_-

Def ect skippins

i

i I

re-orier.rtation-

!

| I

check

I

l

check

I

--T--

lssjo"gnlyt - I

--+--

(3340only)

I

t

i

| , lData

Modure

type

i

I

I

i iundetermined

]

i I

I lat

Initial

selection

I i ____ f

iF

40

ll-l(r,/ll-l-l

[teict-cttcc

Nl.trtttal

SENSE

BYTE

FORMAT

4

SUMMARY

Bito

1

2

3

4

5

6

7

CYLINDER

ADDRESS

CYLINDER

ADDRESS

HEAD

ADDRESS

HEAD

ADDRESS

RECORD

NUMBER

SECTOR

NUMBER

FAULT

SYMPTOM

CODE

FAULT

SYMPTOM

CODE

Sense

Data

4l

SENSE

BYTE

FORMAT

5

SUMMr{Ry

CYLINDER

ADDRE:SS

CYLINDER

ADDRESS

HEAD

ADDRESS

HEAD

ADDRESS

RECORD

NUMBER

RESTART

DISPLACEMENT

RESTART

DISPLACEMENT

RESTART

DISPLACE:MENT

ERROR

DISPLACEMENT

ERROR

PATTERN

ERROR

PATTERN

ERROR

PATTERN

*

Count

ldentification

42 IBM

3340144

Reference

Manual

SENSE

BYTE

FORMAT

6 SUMMARY

NUMBER

OF

BYTES

READ

OR

SEARCHED

(Kev

and

Data

Areas

Onlv)

NUMBER

OF

BYTES

READ

OR

SEARCHED

(Kev

and

Data

Areas

Onlv)

NUMBER

OF

BYTES

READ

OR

SEARCHED

(Kev

and

Data

Areas

Onlv)

NUMBER

OF

BYTES

READ

OR

SEARCHED

(Kev

and

Data

Areas

Onlvl

NUMBER

OF

SEEK COMMANDS

PROCESSED

NUMBER

OF

SEEK

COMMANDS

PROCESSED

CHANNEL

A if

bYte

18

bit

0

is 0

CHANNEL

C

if

bYte

18

bit

0 is

1

DATA

OVERRUNS

CHANNEL

A if

bvte

18

bit

0

is 0

CHANNEL

C

if bYte

18

bit

0

is 1

COMMAND

OVERRUNS

CHANNEL

B if byte

18

bit

0 is

0

CHANNEL

D

if

bYte

18

bit

O is 1

DATA

OVERRUNS

CHANNEL

B

if byte

18 bit

0 is

0

CHANNEL

D if

bYte

18

bit

0

is 1

*

Bvtes

18-23

Not

device-dependent

information.

Sense

Data

43

OPERATING

INSTRUCTIONS

3340

OPERATOR

PANEL

Ready

Indicator

Lights

when

the

data

module

is

properly

inserted

and

ready

for

operation.

Start/Stop

Switch

With

the

switch

set

to

Start,

the

cover

is

locked,

the

data

module

is

loaded

and

tire

treaOs

are

inoveO

to

track

0,

provided

that:

l.

The

drive

power

is

on.

2.

The

data

module

is

in

place.

3. The

cover

is

closed

and

latched.

When

the

switch

is

set

to

Stop,

the

data

module

unloads

and

the

cover

unlocks.

fne

Ouiu

-oOute

cannot

unload

while

the

system

is

communicating

with

the

drive

or

with a pending

Attention.

Read

Only

Indicator

Lights

when

the

write

function

is

inhibiterl

after

the

data

module

is

loaded.

Write

is inhibited

Uy

enabling

the

Read

Only

function

on

the

data

modud.

Cover

Locked

Indicator

Lights

when

the

drive

cover

is

locked.

Attention

Pushbutton

By

operating

the

attention

pushbutton

the

drive

begins

a

Rezero

operation:

l.

Read/Wiite

heads

are

moved

to

track

0.

2.

DM

(data

module)

Attention

is

signa,led

to

the

controller.

3.

Drive

is

placed

online

and

CE

mode

is

reset

(after

maintenance

completion).

3344

OPERATOR

PANEL

Ready

Lamp

The

Ready

lamp

tums

on

when

the

drive power

is

on,

the

drive

speed

is

up

to

normal,

and

the

head

is

on

a

track.

Start/Stop

Switch

The

drive

Start/Stop

switch

starts

and

stops

a drive.

wnen

set

to

Start,

the

brake

is

released,

the

disks

start

spinning,

and

t,

e heads

move

to

cylinder

0.

When

set

to

Stop,

thc

heads l ,

r&ct,

the

brake

engages,

and

the

disks

stop.

An

electrical

interlock

in

the

stop

position

prevents

a stop

if

the

drive

is

ousv.

Attention

Pushbutton

When pressed,

the

Attention

pushbutton

starts

a

Rezero

operation.

Rezero

moves

the

heads

to

track

zero,

resets

the

address

registers,

and

signals

attention

to

the

controller.

R/W

or

Read

Switch

When

in

the

Read position,

no

write

or

erase

operation

can

be

done.

If

set

to

R/W,

all

normal

operations

are

possible.

If the

switch

position

is

changei

during

an

operation,

the

condition

does

not

chanle

until

the

operation

is

completed

E@@

@

r--l

44

IBM

3340144

Reference

Manual

3340/3344

POWER

PANEL

Machines

Without

String

Switch

Feature

Machines

With

String

Switch

Feature

Enable

Enable

^0,0

Drsablr

f)tsablrr

Enable/Disable

Switches

The

Enable/Disable

switches

(A

or

B intertace)

can

be

used

to

dedicate

the

3340-A2

and

associated

drives

to

a

single

interface'

Interlocking

is

provided'

Power

On

Switch

Operation

of

the

Power

On

switch

allows

ac

power

to

be

applied

to

the

3340

or 3344

provided subsystem

pow-i is

present. The

switch

is bypassed

by

the

sequencing

controls

during

a system

power-up opera-

tion.

Power

Off

Switch

Operation

of

the

Power

Off

switch

removes

ac

power

from

the

3340

or 3344

when

system

power

is

up'

During

a

system

power-down

operation,

this

switch

is

bypasied

ind

power

is

removed

by

the

sequencing

controls.
Note:

Do

not

use

Power

On/Power

Off

switches

to

load

or

unload

the

data

module'

m

m

Operatinglnstructions

45

DATA

MODULE

LOADING

1.

Place

the

Start/Stop

switch

in

the

stopr position.

2.

Open

the

top

cover.

3. With

the

data

module

doorway

facing

the

rear

of

the

drive,

lower

the

data

module

into

the

drive

shroud

recess

until

it

is

seated.

4.

Close

the

top

cover.

5. Place

the

Start/Stop

switch

in

the

start.

position.

The

Cover

Locked

indicator

will

light

iindicating

the

start

of

the

load

sequence.

6.

The

data

module

is

automatically

loaded.

After

20

seconds,

the

Ready

indicator

will

light

to

show

the

drive

is

ready.

This

also

forc,gs

a

pack

Change

Device

End

Interrupt

to

the

storage

control.

:

Note:

Correct

data

module

loading

a!.epends

on:
a. Proper

data

module

alignment

in

the

drive

shroud

recess.

b.

The

3340

top

cover

being

fulty

cktsed.

c.

The

3348

Model

70F

being

used

only

on

drives

having

the

fixed

head

feature.

If

the

Model

70F

is

loaded

on

a

drive

wiith_

out

the

fixed

head

feature,

the

Ready

light

indicates

ready,

but

the

drive

is

not

onliie

to

the

system.

Intemention

Required

is

set

in

the

sense

information.

Fixed

head

drives

can

operate

with

any

data

module.

7. If

the

data module

fails

to load,

the

Reardy

indicator

does

not

light.

press

the

drive

Reset

switch.

If

nothing

happens,

place

the

Start/Stop

switch

at

Stop

and press

Reset

again.

Ilf

the

drive

does

not respond,

call for

customer

engineer

assistance.

DATA

MODULE

UNLOADING

l

Place

the

Start/Stop

switch

in

the

stop

position.

2.

When

the

Cover

Locked

indicator

turns

off.

open

the

top

cover.

3.

Lift

the

data

module

from

the

drive.

Reset

Switch

MmE

r-Er

Operator Panel

Opening

Cover

46 18M3340144

Reference

Manual

Load/Unload

Dara

Module

READ ONLY

FUNCTION

The

Read Only

function

protects

previously

written

data. On the 3344

units

a Read

or

R/W

switch,

used

for this

purpose,

is

located

on

the operator

panel. In

3340

units the

means

for

protecting data is located

on

the

data module.

Enable

Read Only

Function

1.

With

the data

module

removed

from the drive'

press

down the

IBM

logo

inset of the

handle

(A

and

B).

2.

Turn

inset

180" and

snap

into

place

(C).

3.

The

data

module

may

now

be

loaded

in the

desired

drive.

A

Read/Write

Disable

Read

Only

Function

1.

With

the

data

module

removed

from

the drive,

return

the

IBM

logo

inset to

its

original

position

reverse

180'

(D).

2.

The

data

module

may

now

be loaded

into the

desired

drive.

Note:

Do not

attempt

to

enable

or disable

the

Read

Only

function

while

the data

module

rests

in

the

drive

shroud

recess.

C

Read

Only

D

Actuate

from

Read

Only

to

Read/Write

B Actuate

from

ReadAl/rite

to

Read

Only

Operating

Instructions

41

INDEX

A

AC

on indicator

45

Access

mechanism

2

motion

time

16

Address

cylinder

4l

flag

l0

head

4l

home

8,10

present

38,40

previous

38,40

se6k

l6

Addressing,

device

l6

logical

6

multiple

l6

physical

6

Areas

count

8

data

8

key

8

Attention

check

38,40

pushbutton

44

B

Bus

out

parity

20

Busy

37

Byte

detection

code

I

I

flag

l0

head

22

home

address

10

skip

displacement

l0

C

Capacities

cylinder

and

track

12,14

data

module

13,15

Cartridge

(see

data

module)

6

Channel

A 43

Channel

C 43

Channel

command

word

(CCW)

l8

Channel

commands

listing

control

25

read

25

search

25

sense

25

write 25

summary

control

27,28

read

29,30

search

33

sense

26

write

31,32

Channel

status

word

(CSW)

l8

Characteristics

I

Checks,

error

37.39

Command

reject

20

Configurations

DDA

4

rFA

(3135)

5

ISC

or 383G2

5

48 lBM334Ol44

Reference

Manual

maximum

5

Control

integrated

storage

4

33&-A2

2

Control

commands

listing

25

summary

22

Correctable

errors

20

Count

area

8

Cover

locked

44

Cylinders

alternates

6

cylinder

boundary

20

number

l0

D

Data

area

8

Data

check

20

Data

length

l0

Data

module

data

surface

format

6

illustration

7

initialization

6

models

6

illustration

6

types

6

Data

records

8

Data

security

and

privacy

l7

Data

surface

format

6

Data

transfer

rates

l7

DC

On indicator 45

DCB

(detection

code

bytes)

I

I

DDA

(direct

disk

attachment)

4

Defect

skipping

I

Delay,

rotational

17

Detection

code

bytes

(DCB)

I I

Device

release

28

Device

reserve

28

Devices,

storage

control

3

Diagnostic

load 28

Diagnostic

sense

26

Diagnostic

write

28

Direct

Access

storage

I

Direct

disk

attachment

(DDA)

4

Disk

storage

configuration

4

features

3

modules

I

Drive

addressing

selection

l6

E

End

of cylinder

20

Environmental

data

present

20

Equipment

check

20

Erase

3l

Error

condition

table

20

correction

function

l8

recovery

action

l8

Error

condition

table 20

Errorcorrectionfunction

l8

Error

displacement 42

Error

pattern

42

F

Fault

symptom

code

41

Features,

3340

fixed

head

3

remote

switch

3

rotational

position

sensing

string

switch

3

Feature,

3344

string

switch

3

File

protected 20

File

protection

17

Fixed

head

3

Flag

byte

l0

Formats

record

count

area

8

data

area

8

key

area

8

track

8

Function,

read onlY

4?

G

Gap

Gl

l0

G2

l0

G3

l0

G4

ll

H

Head

selection

time

l6

Home

address

8

I

IFA

(integrated

file

attachment)

Index

even

6

odd

6

Indicator

cover

locked

44

Power

Off

45

Power

On

45

read

only

44

ready

44

Initialization,

data

module

6

Inpul./outPutoPerations

16

Integrated

file attachment

(IFA)

Inteerated

storage

control

(lSC)

lnteivention

required

20

Invalid

track

20

ISC

(integrated

storall

control)

K

Key

area

8

channel

commands

25

length

(KL)

I I

L

Length

data

1l

key

ll

Loading,

data

module

46

4

4

M

Macro-orders

2

Message

summarY

36

Module,

Data

I

Multitrackoperation

20

N

No

operation

27

No

record

found

20

Number,

cylinder

l0

o

Operating

instructions

data

module

loading

46

data

module

unloading

46

read

only

function

47

Yq/1344

operator

Panel

44

33&/3344

power

Panel

45

OperationincomPlete

20

Operator

Panel

attentionPushbutton

44

cover

locked

44

read

only

indicator

44

ready

indicator

44

start/stoP

switch

44

Overrun

command

43

data

43

P

Panel

3340/1344oPerator

44

33Q/3344Power

45

33N/3344

string

switch

45

Physical

address

l6

Power

off

switch

45

Power

on

switch

45

Power

panel

Power

On

indicator

45

Power

Off

indicator

45

enable/disableswitches

45

power off

switch

45

power

on

switch

45

Preventivemaintenance

I

Programming

error

20

R

Read

and

reset

buffered

log

26

Read

commands

listing

25

summary

29

Read

count

29

Read

count

keY

data

30

Read

data

29

Read

home

address

30

Read

initial

Program

load

29

Read

key

data

29

Read

multiPle

count

keY

data

30

Read

onlY

function

descriPtion

l7

3340

r7

3344

17

disable

4?

enable

47

lndex

49

Read

only

indicator

44

Read

record

zero

(R0)

29

Read

sector

30

Read/write

rates

l7

Ready

indicator

44

Recalibrate

2?

Record

data

8

equal-length

9

format

8

length

l2

overflow

[l

zero

l0

Record

number

42

Record

overflow

8

Recovery

action

table

2I

Remote

switch

attachment

Restart

CCW

I

l8

Restart

CCW

2

l8

Restart

displacement

42

Restore

27

Rotational

delay

average

l7

maximum

17

Rotational

position

sensing

R,/W

or Read

switch

44

power

off

45

power

on 45

start/stop

44

System

attachment

I

System,/370,

models

3

System/370,

direct

access

for

T

Testl/O

26

Timing

specifications

access

motion

l6

head

selection

l6

rotational

delay

l7

Track

capacity

9

capacity

formula

9

defective

20

descriptor

record

8

format

description

8

illustration

l0

Track

descriptor

record

(R0)

U

Unit

check

l6

Unloading,

data

module

45

v

Verification,

seek

l7

Voice-coil

2

w

Write

commands

listing

25

summary

31

Write

count,

key,

and

data 32

Write

data

31

Write

home

address

(HA)

32

Write

inhibit

20

Write

key

and

data

31

Write

record

zero

(R0)

3l

Write

special

count,

key

and

data

Nurneric

3340/3344

disk

storage

configuration

I

models

3340-A2
3340-8

I
J340-82
t344-82

134+B2F

I

operator panel

44

power

panel

45

3344

disk

storage

I

3348

data

module

capacities

6

models

6

illustration

6

S

Search

commands

listing

25

summary

33

Search

home

address

equal

33

Search

ID

equal 33

Search

ID

equal

,rr

high 33

Search

ID

high

33

Search

key

equal

33

Search

key

equal

or high

33

Search

key

high

33

Sector

number

42

Seek

address

l6

Seek

check

20

Seek

cylinder

27

Seek

head

27

Seek

verification

l7

Sense

byte

summary

34

Sense

commands

listing

25

summary

26

Sense

data

34

Sense

I/O

26

Servo

system

2

Set

file

mask

27

Set

sector

22

Skip

displacement

l0

Space

count 27

Speed,

access

and

data

transfer

l6

Start/stop

switch

44

Storage

control

IFA

4

ISC

4

3830-2

4

String

switch

enable/disableswitches

45

feature

3

Summary,

format

I

3340

sense

byte

37

3344

sense

byte

39

Switches

enable/disable

45

3t

50

IBM

3340144

Reference

Manual

GA26-1619-4

rar-- ­1rt n )t \/ /

l-iteJlITl

Inlernational

Business

Machines

Corporaiion

Data

Processlng

Division

1133

Westchester

Avenue,

White

plains,

New

yorlk

10604

(U.S.A.

onty)

IBM

World

Trade

Corporalion

821

United

Nations

plaza,

New

york,

New

york

10t017

(lnternational)

ft

(D

(D
cl

3

sr

o

6
=
(,

(.)

5

o
(.)

(r,

5

s
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x
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o

(o

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{

'o

-r.

o

5'
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o

N

I

o)

(0

A

READER'S

COMMENT

FORM

G426-1619-4

Reference

Manual for

IBM 3340/3344

Disk Storage

.

Does this

publication meet

your

needs?

.

Did

you

find

the material:

Easy

to read and understand?

Organized

for convenienrL use?
Complete?
Well illustrated?

Well indexed?

Written for

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technical level?

What is

your

occupation?

your

comments,

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to the

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ff

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,is "'no" or requires

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space

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All comments

and

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!

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tsxplain

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!

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a
o

Yes

No

nl

!T

L]u

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an

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For

advanced

knowledge

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For

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procedures?

Other

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D

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student

in a class?

D As

a reference

manual?

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!

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U.S'A

G426-1619-4

Your

comments,

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.

. .

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manual

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a reference

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analysts,

programmers,

and

operators

of

IBM

systerns.

Your

comments

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the

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york,

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york

10017

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READER'S COMMENT

FORM

GA26-1619-4

Reference

Manual

for

IBM 3340/3344

Disk

Storage

o

Does

this

publication

meet

lrour

needs?

o

Did

you

find the material:

Easy to

read and understand?

Organized

for

convenierLt

use?
Complete?
Well illustrated?
Well

indexed?

Written for

your

technical

level?

Your comments,

accompanied

by answers

to the

following

questions, help

us

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publications for

your

use.

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"'no" or requires

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please

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space

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proprerty

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Yes

!

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n
tr

I

!

No

D

Explain

a
a

u

!
C

u

D
!

No

n

D
!

Yes

No

n!
DN

!!

What is

your

occupation?

How

do

you

use this

publication?

As

an

introduction

to

the subject?

For

advanced

knowledge

of the subject?

For

information

about operating

procedures?

Other

We would

appreciate

your

clther

comments;please

give

specific

page

and

line references

where

appropriate.

lf

you wish

a

reply,

be sure

to include

your

name

and address.

o Reply

Requested

Yesr

C

NoO

Name

Address

Yes

!

tr
n

As an

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o

Thank

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Z..LPD

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. .

.

This

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and operators

of

IBM

systems.

your

comments

on the

other

side of

this

form

will

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and

publishing

this

material.

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cdmments

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95193

T

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­T

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Attention:

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publishing,

Dept.

G26

Fold

F

otd

[tsnfi

International

Butlnerr

Machlner

Corporatlon

Data

Procerlng

Dlvirlon

1133

Westcheller

Ayenue,

Whlte

ptalnr,

New

vorl(

lO0O4

(U.S.A.

onty)

lBil

World

Trade

Corporailon

821

Uniled

Natlonr

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york,

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yort

lOOl7

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/

[Bnfi

/recnnicat

Newstetter

/

I{el'erence

l\hnual lbr

llJM

3340i3-144 l)isk Slor:rge

C) llJNl ( rrrp.

1973. 197.1,

1975

-l
lris

Tcclrnical Ncwslottci

l-rlovrtics

rcpiect'rncrrl

Puges

lirr

thc srrlricct

prrltlit:iriiorr. ['ug,-'s

1o

irt:

replaced

alc:

iii. iv
24

5,6

.)(

)n

35

thrtruglr

-10

,\ cltartgc to

thc lc-x1

or-an

illL.rst

r.rtion

is

indrcatctl b1' a vcrticril iirrc to tlrc lclt

ol'llrc

t:llrr,,qc.

Sutrttnarv ol,,\rrtenclntcrrts

I. Arld

ticscriPtiort

rri'Scrsc

l,tO

-i-r,'|,:
corrlrrlrrrtl.

l. Iipdllt- sonse l)],tc 4.

drrvc itierrriilcuir'.rrr

ttir.l-;4-1.

.1. Upclatc

scrrsc tryLc 2i;tlrivc

tderrttiitrltiorr 1or -j-l,i-1.

,1.

Niakc

etlditiorrai tuclrrricul

cltariges 1() si:itsc

(iitiir

I\ote:

1'1'.'rrsc

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(()rer

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ltut li

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llr u rt'r',trtl

,t.1

r'iruri,tt.'.t.

This Newsletter

No.

CNl6-0jiE

Date

t\hi' 2ir. 1976

Base

Publication

No.

CA16- 1() I

9-4

File

No"

S:i7U-0,I

Previous l\lewsletters \orrr:

IBM Corporation,

Technical

Publishing, Dept. G26, San

Jose. California

95193

Prif

t.iti

if

i..1.:i. /\