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GA26-1619-4
F i l eN o . 5 3 7 0 - 0 7




Reference
Manualfor
Systems IBM 3340/3344 Disk Storage




IEnfi
PREFACE,

This publicatic,nis intended to familiarize rCata
proc- 3340/3344 Operator and Power Panels. Provides
essingpersonnellvith the characteristics IBM
ol' suggested instructions for data module unloading
3340/3344 Disk Storage. The reader should have and loading procedures and the EnableT'Disable
prior knowledge of direct-access storagedievices and Read Only Function.
concepts.
The following publications are recommendedfor
This publication is organized by topics as follows: detailed information concerning the subjectscovered
r I N T R O D T i C T I O N - D e s c r i b e s a s i c u n i r sa n d
b in this manual:
lists highlights and f'unctions.
c IBM System/370 Principles of Operatlon, Order
o CONFIGTJRATIONSand ATTACHVIENTS - No. GA22-7000.
Defines sornepossi'trle combinationsand svstem
c IBM 3348 Data Module Handling Procedures,
a t t a c h m e n t so r t h e 3 3 4 0 i 3 3 4 4 .
f
O r d e rN o . G A 2 6 - 1 6 2 5 .
o FEAT'URF,S- Describesboth standandand
o IBM ,1340 Disk Storage Fixed Head Feature
optional fe:rturesavailablefor the 334(l/3344 with
UsersGuide. Order No. GA26-1632.
illustrationsof some combinations.
c IBM Reference Manual for Integrated Storage
o FORMATS - Describesand illustratesthc record
and track Irtrnratsfor data. Also provided are Contol. Order No. GA26-1620.
Record,iT'rack capacity charts including formulas o IBM Reference Manual .f-or 3830 Model 2
for capacitll calculationsof various length records. StorageControl,Order No. GA26-1617.
o I N P U T / O L T T P U T - I n c l u d e sa d d r e s s i n g o The Data Processing Glossary, Order No. GC20-
m e t h o d s . a c c e s s i n t e s .a n d i d e n t i f i e ss e c u r i t ya n d
t | 699, defines terms related to direct-access
storage
p r i v a c y m e : a n s .L i s t s a n d s u m m a r i z e sh et devices.
3340/3341 command set and sensebyte formats.
o Thc functional characteristics
manual applicableto
A l s o i n c l u d e sa n e r r o r c o n d i t i o n t a b l e a n d t h e
{lrror recovery actions. thc parent system. C)rcler
numbers for functional
associated
characteristicsmanuals can be found in the IBM
o OPERAI lNG INSTRUCTIONS - Describes ll a .S.y.stem/ and System/ 370 Bihliography,
360
switchesanrdindicators associatedwith tht: Order No. GA22-6822.




Fifth Edition (July 1975)
'Ihis
p u b f i c a t i o n r c p l a c e s a r r d n r a k c s R e . l ' e r e n c e a n u u l { r : r l B l l [ - t- ] 4 0 D i s i
M
S t o r a s e ,O r d c r \ , r . G A 2 6 - 1 6 1 9 - 1 . o b s o l c t c .

S i g n i f i c a n t c h a t t g , : s r r a d d i l i o n s t o t h c s p e c i f i c a t i o n sc o n t a i n c d i n t h i s n u b l i e a r r g n
t
a r e c o n t i n u a l l y h c - i n gn t a d e. B c f o r c u s t t r gi h i s g r u b l i c z r t i o in r c o r r n e c t i o nw i t h t h e
r
o p e r a t i o n o f I B M e q u i p r n e n t , c ( ) n t a c tt h e l o c : r l I B M B r a n c h ( ) f l i c e f o r r c v i s i o n s .

c o p i e s o f t h i s a r r d o t h e r [ 8 1 \ 1p u b l i c a t i o n s c a n b e o b t a i n e d t h r < i u s h l l ] f u l l l r a n c l r
C)ffices.

. A f o r m f o r r e a d c r ' sr o m m c l l t s i s p r o v i < 1 e d t t h c b a c k o f l l i i s n u b l i c a l i o n , l f t h r :
a
f o r n r h a s b e e n r e n t o v c d . s e n d v o u r c ( ) n t i n e n t : t, o t h e a d c l r e s s , : l o w .
h
'fhis
nranualwas preparedby thc IBM Gc'cral Pr'duc1s [)ivision. Craphics and
P u b l i s h i n g . D e p a r t m c n t G 2 6 . S a n . , I o s eC l a i i f o r n i a9 5 1 9 3 .
.

! : ' C o p y r i g h t l n t e r n a t i o n a l I l u s i n c s sM a c h i n e s C o r p o r a t i o n l g 7 j . 1 9 7 4 , 1 9 7 5 .




ii IBM 334014'1 ferencc
Re Manual
P a g co l ( i A 2 6 - 1 6 1 9 - , 1
R c v i s c dM a y 1 6 . l t ) 7 6
By'l NL: (;N26-012ti



CONTENTS

Introduction Access Motion Time . t6
I B M 3 : 1 4 0D i s k S t o r a g e Head SelectionTime l6
DataModule.... R o t a t i o n a lD e l a y . t1
'l'ransfer
Defect Skipping Data l1
IBM 3344-82ll]2F Disk Storage . . . . Data Security and Privacy . . 11
I B M 3 3 4 0 / 3 3 4 4U n i t s ReadOnly Function 11
3340/3344 Storage Clontrol and Features 3 FileProtection... 11
StorageControl Devices 3 S e e kV e r i f i c a t i o n . 11
S p e c i a lF e a t u r e s 3 ErrorRecoveryProcedure..". 18
StringSwitch.... 3 E r r o r C o r r e c t i o nF u n c t i o n . . . 18
Rotational Position Sensing 3 ltJ
Error ConditionTable
Fixed Heirds 3 E r r o r R e c o v e r yA c t i o n l8
Configurrations.... 4 C o n s t r u c t i o nR f s t a r t C C W s
oe ....... l8
3340 Stc,rage Without 3344 . 4
M o d e l iI l 5 ( 1 1 5 D D A ) A Channel Commands l.)

M o d e t 1 ' 2 5( 1 2 5 D D A ) 4 SenseCommancls . i-)

M o d e L1 3 - 5 I F A )
( 4 Control Commands _-)
M o c l e l s 3 5 . 1 4 5 . 1 5 5 - l l ,1 5 8 , 1 6 5 - l l ,
1 R c a dC o m m a n d s . J)

a n c l l 6 8 ( 3 8 3 0 - 2 )M o d e l s 1 4 5 , l 5 B . Write Commands . -:)
ancl168 (lSC) 4 S e a r c hC o m m a n d s i)
3340/3344 Configurations . . . .4
Sense Data l4
M o d e l l . 1 5( I F A ) 4 j'1
S e n s eB y t e S u n t m a r y
M o d e l 1 3 5 , 4 5 , 5 5 - t l1 5 8 , 6 5 - l l .
1 1 . 1
s ScnseBytesO-7Suntmary..., -15
a n r l1 6 8( 3 8 3 0 - 2 ) o d e l 1 4 5 ,1 5 8 ,
M s 3 3 4 0 S e n s eB y t e F o r m a t I S u m m a r y l(r
a n d1 6 8( l S C ) 3344 SenseByte Fornrat I Summary -lti
IBM 33418 Data Module . . . . 6 Formatsl, 4, and 5 Message ummary S 40
Data Mc,duleTypes 6 S e n s eB y t e F o r m a t 4 S u m m a r y 1l
DataMo'duhInitialization . . . 6 SenseByte Format 5 Summary 4)
SenseByte Format 6 Summary '+-3
D a t a S u r f a c cF o r m a t 6
Formats 8 Operating Instructions ,+4
Record Format 8 3340 OperatorPanel 44
Count Area 6 3 3 4 4 O p e r a t o rP a n e l 14
Key Area d 3340/3344 Power Panel .
Data Area 8 Machines Without String Switch Feature 4l
TrackFormat.... 8 M a c h i n e sW i t h S t r i n s S w i t c h F e a t u r e 4-\
Home Acldress d
Data Module Loading 46
Track Descriptor Record (R0) 8 Data Module Unloading 4()
DalaRecords.... 8 ReadOnly Function '+7
'frack
Capacity 9 Enable Read Only F-unction 1'1
Input/Output Operations lo D i s a b l eR e a d O n l y F u n c t i o n 1l
Device Selectionand Addressing . . . l6
l6 Index. 48
Device Address
S e e k A d c l r e s s. . . I O

Access and Data T'ransferSpeed . 16




C o n t en t s iti
[ ' a - e ct ' l C , ' \ ] r i - l ( r l 9 - . 1
Rt'viscd\1ay 2(r. l9 /(,
tsy'l Nt-: (;\16-().1:tt



FIGURES

F i g u r e l . Ittlvl3340/:1,144 DiskStoraire . . . lic:nse urnrnand\
L l(r
F i g u r e 2 . I F A 3 3 4 0 / - i 3 4 4 a x i m u nC e n l ' i s u r a l i o n
M r 5 ( lontrol (.onrnrirrrils ) l


F i g u r e3 . ISC or 3IJ30-2 Maximurn Llonl"isuration ) R c a c i( - o r n n r a r r d s -19
F i g u r c 4 . l ) a t a S u r f a c e ' l ' r a c kl - a y , o u t. . . . . W r i t . e( . ' o r n m a n L l s -)l
F i g u r e5 . l ) a t a M o d u l e ( i e o n r c t r v S e a r c h( . ' o r n n r a r r r l s ll
l'igure b. l { e c o r d a n d ' l ' r a c k F o r m a r S c r r s c[ 3 y t . e s . ] - J S u m n r a r y . . . . . .
( ,15
-
F i g u r e7 . l ' r a c k , / ( l y i i n c l cC : . i p a c i t i r : sN o K c l s .
r - J - 1 . 1 '0 r r l r a ti 5 c ; t s cl l t t c S u n i l t r a r v. . . . . .
l o 36
Figurc8. Darta odule Capacitics Ntr Keys . . . .
M -
-l-rack,/Cylincle - l . l - 1 .l1o r r r u r l I S c n : ; cB y t c S u n r u t a r y . - .
" -18
F i g u r c9 . ,
r C a p r a c r t r c sW i r h K c y s
l r o r m a t s l . 4 , a n d 5 M e s s a p ' . q 'u r n i r r . r r v
S 10
F i g u r e 1 0 . D a t a f r 4 o d u i e a p a c i t i c r, V ' 1 i r h L : y ' s
C K
F o r n t . r t- l S u l r r n r r r y 4l
Irigure I I . Errclr C 'l I o l m u t - 5S u r t ) n l i i r ) .1,l
F i g u r e 1 2 . R c c o v e r yA c t i o r r a b l c .
6
Frrfilli-rl Sutilnlltrv -tr.1
O p c r a t o r P a n c : i ,l l - 1 4 0 a n c l 3 j " l 4 " :i4
P o w c r l ) a r r e l , 3 3 4 f )/ 3 3 4 1
ljata Module [.oad,'Linlrred ,16
llttrtl ()lriv l,rr( ll.tl ,47




it l l J \ l . i . l J U , . + R c l u , r r . t r I it l' r r r u : r l
+ .
INTRODUCTION

The IBM 3340 Disk Storageprovidesdirect- IBM 3344-B2IB2FDISK STORAGE
access storage IBM System/370
for Models I 15, 125,
1 3 5 ,1 4 5 ,1 5 5 - I I ,1 5 8 ,1 6 5 - I I a n d 1 6 8 . T h e 3 3 4 0
, The IBM 3344-BZlB2Fdual-drive unit provides
consists a Model 42, control with dual-drivedisk
of increased capacity,lower-cost-per-byte, direct access
storage, and up to three attacheddual (B2) or single storage.Each3344 drive storesfour timesthe
(Bl) drive units. The 3344large-capacity, dual-drive quantityof dataof a 7O-megabyte moduleby data
unit can be substitutedfor the 3340 B-type units usingfixed media. The 3344 dual drivescanreplace
o n I B M S y s t e m / 3 7 0 o d e l s1 3 5 , 1 4 5 , 1 5 5 - l l , 1 5 8 .
M the 3340B-drives a 3340stringon IBM System/
in
1 6 5 - I I ,a n d 1 6 8 . 3 7 0M o d e l s 3 5 ,1 4 5 ,1 5 5 - I I 1 5 8 ,1 6 5 - I Ia n d 1 6 8 .
1 , ,
The 3344-B2F contains fixedheadstorage.
The 3340/3344 is a modular,high-speed,
large- Defectskipping, similiarto that usedon the 3340,
capacitydisk storagesubsystem data base,data
for is alsoused the 3344-B2|B2F.
by
communication, generalpurposeuse.
or

IBM 3340/3344UNITS
IBM 3340 DISK STORAGE
^fhe334O/3344
The IBM 3340 direct-access
diskstorage made of a maximum
is up
storageintroducestwo
of four dual-drives.The input/output interfaceis a
technological
advances: data moduleand defect
a
3340 Model A2 containingtwo independent drives
skipping.
and their control logic. Up to three additional
attacheddual-drivesare controlledby the A2 unit.
Data Module The 3340 Model B containseither one or two drive
The sealed data modulecartridgecontainsstorage mechanisms. The Model 81 containsa singledrive;
disks,drive spindle,read and write heads,and access the Model 82 containstwo drives. Each model
arms. The data modulehasseveraladvantages over a containsall necessary electronicand power supply
disk pack: circuitsfor internal use,but data control and power
sequencing comesfrom the A2 unit.
o The drive data storagecapacitycan be changed by
usinga different data module. The 3340 Models A2,B2, and Bl usethe 3348 data
moduleas a storagemedium.
o The heads,storagedisks,and drive spindleare
sealed insidethe data module. This avoidscontam- The 3344 dual-drivemodelsusefixed mediastorage
ination from outsidesources preven-
and reduces insteadof a data module. The following characteris-
tive maintenance. tics apply to both storagedevicetypesexceptthat the
3344 storagecapacityis279.5 million bytes-per-drive
o Reliabilityis improvedas eachheadreadsonly the
and start time is not significantbecause storageis
the
data that it previouslywrote.
not moved.
The 3340/3344 offers the following:
Defect Skipping
o Start time - lessthan 20 seconds
Defect skippingallowsdata to be storedboth aheadof o Averageaccess time - 25 milliseconds
and following a surfacedefect. All of the recording
track can be usedexceptfor minute portions. Since o Averagerotationaldelay - 10.12milliseconds
the headsno longerneedbe movedto an alternate o Nominal read/write rate - 885,000bytes-per
track, accesstime is saved. second
Data modulecapacityis not changed defectskip-
by -
r Data modulecapacity 34,944,'768 69,889,536
or
ping and t.heuseris rinawareof defects. bytes




Introduction I
IBM 3340-A2 (Controland Two Drives) IBM 3340-8l (One Drive), IBM 3340-82 (Two
Drives),and IBM 3344 (Two Drives)
CONTROL r R e s p o n d so c o m m a n d s r o m t h e 3 3 4 0 - 4 2
t f
. I n t e r p r e t s n d e x e c u t e s a c r o - o r d e rfs o m t h e
a m r (controller)
storagecontrol r P o s i t i o n s c c e s sm e c h a n i s m i t h v o i c e - c o ia n d
a w l
r R e g u l a t e t h e s t o r a g ec o n t r o la n d d i s k $ t o r a g e
s m a i n t a i n sr a c kf o l l o w i n gw i t h e l e c t r o n i c e r v o
t s
interfaces system
o S e r i a l i z ea n d d e s e r i a l i z ed a t a
s s r Selectshead
r Checksdata integrityby error detectionand error r R e a d sa n d w r i t e s d a t a
correction nalysis
a r Providessafety and servicinginformationfor subsys-
o F u r n i s h e s t a t u st o t h e s y s t e m t e m a n d s y s t e me v a l u a t i o n
o Performs iagnostic valuation f the 3:140/3344
d e o 3 3 4 0 - 8 1 a n d 3 3 4 0 - 8 2 : H o u s e s , o a d s ,f i l t e r s ,a n d
l
storagestnng
drivesthe 3348 data module(s) variousstorage of
c a p a c i t i e sM o d e l s3 5 , 7 0 , a n d 7 O F ) .
(
DRIVES
o R e s p o n d so c o m m a n d s r o m t h e 3 3 4 0 - 4 2
t f 3 3 4 4 - 8 2 a n d3 3 4 4 - B 2 F : H o u s e s f i l t e r s ,a n d p o w e r s
,
(controller) two fixed media drives. Each3344 drive is equivalent in
c a p a c i t y n d f o r m a t t o f o u r l o g i c a l 3 4 8 M o d e l7 0
a 3
o H o u s e s , o a d s ,f i l t e r s ,a n d d r i v e sa 3 3 4 t |d a t a m o d u l e
l v o l u m e s , t o t a l o f 2 7 9 . 5 m i l l i o nb v t e so f d a t a .
a
w h i c h h a s v a r i o u s a p a c i t i e sM o d e l s3 1 i ,7 0 , a n d
c (
70F)
r P o s i t i o n s c c e s sm e c h a n i s m i t h v o i c e - c o ia n d
a w l
m a i n t a i n sr a c kf o l l o w i n gw i t h e l e c t r o n i r :e r v o
t s
system
a Selectsthe head
a R e a d so r w r i t e sd a t a
a P r o v i d e s a f e t ya n d s e r v i c i n gn f o r m a t i o no r s u b s y s -
s i f
t e m a n d s y s t e me v a l u a t i o n


Figurel. IBM 3-140/3344
Disk Storagc




2 IBM 3340144
Reference
Manual
()--l
l ' a g e o l ( i A l . 6 - | ( rI
R c v r s c c lM : r v 2 ( ' . l ( ) 7 6
-l'Nl.: (;N26-O.r2l{
Iiv



3340/3344STORAGECONTROL AND FEATURES


CONTROL DEVICES
STORAGT] Rotational Pnsition Sensing
'[he
f o l l o w i r l gs t o r a g ec o n t r o l c l e v i c e s i l n a c c o m m o -
c
T h c R o t a t i t t n a lP o s i t i o nS e n s i n g( R P S ) f c a t t l r c r e c l u c e s
-
d a t c 3 1 1 4 1 3 3 , 1 4 l i s ks t o r i i P . o .
0 c
l h e c h a n n e lc o n t r e c t i o n i m c r e q u i r e ctl o s c a r c hf o r a
t
o 3 l t 3 0 S t o r a g cC o n t r o l l v l o d e l2 . g i v e n r e c o r t la l ' t e t h c t r a c k a n c lh c a d h a v e t r e e n
r
o S y s t c n r , l - 1 7M o c l c l s l 5 l t a n d l ( r l { l l l t c : p ' 1 a 1 s d
0 s c l c c t e d . T h i s f e r a t u r e o p t i o n a lt l t l t h e 3 3 " 1 0 s t a n c l a r d
( ,
S t o r a g e( l o n t r o l ( I S C - - ) . < i nt h e 3 3 4 4 ) d i s c o n n e c t s h e r r i v c f r o m t h c c h a n n c l
t d
r Syr;tcm7/-170 dcl 145 lSCl.
Mo a n r l p er m i t s o t h e r c h a n n e o p e r a t i o n st o b c r l e r f o r n r e d
I
d u r i n g t h e t i m c r e q u i r c c f o r t h e s p i n c l l e o [ r r i n gt h e
l t
o S y : ; t e m , / 3 7 0 o d e l 1 4 5 S t o r a g cC t t n t r o l F r : t t n c
M r c t l u i r c dr c c o r t l t o t h e r e r r dz w r i t c h c a t l .
3 3 4 5 M o d e l s3 , 4 , a n d 5 .
o S y s t c m , / 3 7 0 o d e l 1 3 5 l n t c g r a t c : c li l c A t t l r c h -
M F A d d i t i < l n a c l e t a i l s n R P S a n c li t s a s s o c i a tc l c o n r -
l o e
r n e n t( l F i A ) . m a n c l s r c f o t t n c li n t h c f o l l o w i n g p t r b l i c a t i < l n s :
a
c Re.ferente Mattutt/ f'or Integraled Stt;roge
SPECIAL }'EATI-]RES C ' o n t r o l .O r c l c rN o . C i A 2 6 - I 6 2 . 0 .
'Ihe o Re.ft:rent'e Manuol for -18-1 Storage C'ontrol,
0-)
I ' h e 3 - 1 4 (d r s k s t o r a g eh a s f o u r s p e c i a ll c a t u r e r s
J
()rclcr o. GA26-1617.
N
M o d e l A 2 c a n h e 's u p p l i e dr v i t h t h e s t r i r r gs w i t c h a n d
t h c r c m o t c l ; w i t c h . A l l 3 3 4 0 n t o d e l sc a u b c o r d e r e d
w i t h R o t a t i o n a lP o s i t i c l n e n s i n g n d F i x e c lI l c a d
S a F'ired FIeads
Storage.
T h c 3 3 4 4 t i i s k s t c l r a g e a s n o s p c c i a ll e a t u r e s .i i s
h 1 ' h c 3 3 4 0 l i x c c lh e a c lf e a t u r e p c n n i t s u s eo l t h c
R o t a t i o n a lP o s i t i < >S.e n s i n g s s t a n d a r t l . F i x e d l l e a d
r r i 3 3 4 t ' t - 7 0 F a t a r n o d u l eo n a r . r y 3 4 0 d r i v c t l ' r r t h a s
d 3
S t o r a g ei s a v a i l a b l e . u t m u s t b e t l r d e r c dL r yn r o c l c l .
b [ - r e e n o n v e r t e df o r f i x e d h e a r -rl. r s c . h i s 7 0 - m c g a b y t c
c T
l ' h e 3 3 4 4 l \ { o c l e R 2 F c o n t a i n sl ' i x e dh c a d s t o r a q ea n t i
l cletamclilulccontains lixed heads in addititlu ttl tl.tc
t h e M o d e l I l 2 d o e sn o t . r r o r m a la c c c s s c a c l s .W i t h t h c s c l ' i x e dh e a c l s5 0 0
h .
t l . r o u s a n h l t c s t l l s t ( ) r a g e r e a v a i l a b l ct h a t h a v e z er < r
cy a
s e e kt i m c . T h c f c r t t t t r e l o c s n o t i t t c r e a s e a t a t r r o c l t t l e
t d
String Sn'itch
s t ( . ) r a g e .c c a t t s e
b a n e q u i v a l e n tl t l l l o L l n o f s t o r a g u '
t
'Thc
s t r i n g : i ' w i t c h ea t t t r c i s i n s t a l l c do n t h c 3 3 4 0 - 4 2
f r u n c t ctr c n t o v i t - t q c l d s b c c o n r c si n a c c e s s i b l c .
h h
'I'his
(controller) [e'ature crrrtitshc 3340 strins t p t 'I'hc
b c d y n a m i c u l l ys h a r e cb y t w o s l o r a g ec o n t r o l t l c v i c e s
l 3 3 4 4 - R 2 I : c l u a l - d r i l ' es a l s o c q u i p p c dw i t h f i x e d
i
-I'he h er d s t < l r a g c .l n t h i s n l < l c l c l , o t h 3 3 4 4 t J r i v c s a v c
b h
f c a t u r c 'i n c l r r c l cts o i n t c r l o c k c c F - , n a [ r l c , / D i s : r h l c
w l
s w i t c h c sa l k r w i n gt h e s t r i r r g1 o b c d e c l i c i r t c do c r t h e
t r I . 0 0 4 m i l l i o t rf r y t e o f z e r o s e e kt i t l e s t o r a l l c . T h i s
s
s t o r a l l ec o n t r o l t t r a c c : c s s i h lb y c a c h . A r eu l o t c
e f i x e d h c a d s t o r a g ci s a s s o c i a t e clln l y w i t h t h c p r i m a r y
t
c o n t r ( ) ls r v i t c hp c n n i t t i n g t h c s w i t c l r e s o h c a c t i v a t c < l
t a d r l r e s s eo n c . t c l t3 3 4 4 i l r i r c ( s e c F - i g u r c s a n t l 3 ) .
s 2
l r o m a l 5 l i o r l 6 l t N l u l t i p r < ) c c s si o r l s ol r v a i l a b l c .
sa
f i o r f r r r t h c re l c t t r i l s n t h e I ' i r e c l ea d I c a t t t r ca r l d i t s
o h
r . r s c l ' r t l n t [ ( )s ( l u r s l - o r a g cr p p l i c a t i o nc ( ) l l t a c t\ ' o t l r
:s y r .
f fJM s;.rlt:s rcprtsctttativc ()r sec lhc [:i.r'etl l]ettd
[ " e u l r r r r I ; . srrt ( ) u i r ] e .( ) r d c r N o . ( i A l 6 - l 6 3 2 .




l . l + o / I 1 . 1 - +S l o n t q c ( o t I i t - o l l t t t t l I t i t l L t t c s
CONFIGURATIONS

'f
h e v a r i o u sc o n f i g u r a t i o n s f 3 3 4 0 / 3 ] i 4 4 d i s k s t o r a g e
o 3340 3344CONFIGURATIONS
/
a r c d i v i d c r li n t o t w o g r o u p s : c o n f i g u r a t i < t nu s i n go n l y
s
3 3 4 0 u n i t s , a n d c o n f i g u r a t i o n s s i n g a c o m b i n a t i o no f
, u W h e n t h e 3 3 4 4 i s u s e d ,n e i t h e r 3 3 3 3/ 3 3 3 O n o r 3 3 5 0
3 3 4 0 a n d 3 3 4 4 u n i t s . T h e s ea t t a c h m e r r m e t h o d s .
t drives can be attached to the same storageconl.rol. A
l i s t e d b y n r o d e l ,f o l l o w . 3 3 4 4 r e q u i r e sf o u r l o g i c a la d d r e s s e f o r e a c hd r i v e .
s
o n l y r h e 1 3 5 , 1 4 5 ,1 5 5 - I I ,1 5 8 , 1 6 5 - i l ,a n d 1 6 8
support the 3344 dual drive.
3340STORAGEWITHOUT 3344I
I n s o m e S y s t e m / 3 7 0 m o d e l s ,s t r i n g so l ' 3 3 3 0 a n c l3 3 5 0 Model 135(IFA)
s t o r a g ed e v i c e sc a n b e u s c d i n a d d i t i o n t o t h e 3 3 4 0 s .
T h e M o d e l 1 3 5 I n t e g r a t e cF i l e A t t a c h m e n t h a s a
l
'fhis
m a x i m u m o f 3 4 l o g i c a la d d r e s s e s . a l l o w st w o
M o d e l 1 1 5( l I S D D A ) s t o r a g es t r i n g st o b e a t t a c h e d : a 3 3 4 0 s t r i n g a n d a
T h c M o d c l I 1 5 u s e st h e D i r e c t D r i v e l r , t t a c h m e n t 3 3 4 0 / 3 3 4 4 s t r i n g ( s e eF i g u r e2 ) .
( D D A ) f o r s t o r a g ec o n t r o l . F o u r d r i v e sc a n b e
a t t a c l r e d :a 3 3 4 0 - A 2 d u a l d r i v e w i t h c o n t r o l .a n d a Models 145, 155-II, 158, 165-II, and 168 (3830-2)
3 3 4 0 - 8 2 ( d u a l ) o r B I ( s i n g l e )d r i v e . Models 145, 158, and 168 (ISC)
S i x t y - f o u rl o g i c a la d d r e s s e c a n b e u s e db y a 3 U 3 0 - 2
s
M o d e l1 2 5( l 2 5 D D A ) o r I S C p a t h w h e n a 3 3 4 0 / 3 3 4 4 c o n f i g u r a r i o ni s
T h e M o c l e l 1 2 5 u s e st h e D D A f o r s t o r m g e o n t r o l a n c l a t t a c h e d . T w o s t r i n g so f 3 3 3 O / 3 3 4 4 s ,a 3 3 4 0 s t r i n g ,
c
c a n a i l - a c h n e s t r i n g o f u p t o e i g h t 3 3 2 f 0d r i v e s .
o a n d a s h o r t s t r i n g o f f o u r 3 3 4 0 d r i v e sc a n b c a t t a c h e d .
F i g u r e 3 s h o w st h e m a x i m u m 3 3 4 O / 3 3 4 4 c o n f i g u r a -
t i o n . O n l y s t r i n g s0 a n d 2 c a n i n c o r p o r a t et h e 3 3 4 4
Model 135 (IFA)
units. E,achdrive has the hexadecimaladdrcsses
T h e M o d e l 1 3 5 u s e st h e I n t e g r a t e dF i l e A t t a c h m e n t assignedrelative to the storagecontrol as shown.
( l F A ) f o r s t o r a g cc o n t r o l . S i x t e e nd r i v e s ,t w o s t r i n g s .
a 3 3 4 0 s t r i n g a n d a s t r i n go f e i t h e r 3 3 4 0 o r
3 3 3 3 / 3 3 3 0 d r i v c sc a n b e a t t a c h e d .


M o d e l s1 4 5 ,1 5 5 - I I , 5 8 ,1 6 5 - I I , n dl 6 S ( 3 3 3 0 - 2 )
1 a
Models145,158,and 168(ISC)
S t o r a g ec o n t r o l f o r t h e m o d e l ss h o w n i r s i t h e r a
e
3 1 3 3 0 - 2 r a n I n t e g r a t e dS t o r a g cC o n t r o l . T h e 3 8 3 0 - 2
o
a n d e a c h I S C p a t h c a n a t t a c h u p t o 3 2 d r i v e s ;f o u r
s t r i n g s f 3 3 3 3 / 3 3 3 0 s ,3 3 4 0 s ,o r 3 3 5 0 si n a n y c o r n b i -
o
nation.




4 tgll 3 l + 0 , / . 1 .R c f e r c n c c M a n u a l
1
02 a3-
1_9 1l_
Lq
1C
u-
1D
Drive 0 1
No,

String 1
3340-A2 3340-82 3340-82 3340-82


D r i v 1 e 2 0 3 4 5
No.

" PrimaryAddresses

l r i g u r e 2 . I F A 3 3 4 0 1 3 3 4 4M a x i m u m C o n f i g u r a t i o n ( H e x a d e c i m a l A d c l r e s s i n g )




02* 07"
22 27
2A 2F
n 37
Drive 0 1
No.

String1
3340-A2 3340-82


Drive 0 1
No.
String2
3340-A2
10* 11* 19" 16* 17*
20 n 1D G Tr
n n 39 3 3B
30 3 so 3E 3F
Drive 2 3
No.
String3
3340-A2 3340-82
1 8l t s 1A I re

* PrimaryAddresses

F i g u r e 3 . I S C o r 3 8 3 0 - 2 | \ 3 4 0 1 3 3 4 1M a x i m u m C o n f i g u r a t i o n ( H e x a d e c i m a l A d d r e s s i n g )




Cor.rfigurations
P : r g co l ' ( i , \ i i f r - l o t ( , - l
R c v i s c d l \ 4 r r 12 6 . l ( ) 7 ( r
,
Uv I-Nt,: (lNl6-0l2l.i


IBM 3348DATA MODULIE

I l ' a m c r d u l e a t a a r e a b c c o m e sd e f e c t i v ec l u r i n gn o r m a l
d
u s c , I B N ' lu t i l i t y p r o g r a n r s r e a v a i l a b l et o f l a g d c f c c -
a
t i v c t r a c k sa n d a s s i g na l i c r n a t e si f r e q u i r e d( D A S D I
and AII-AS for OS and AL'IDK for DOS).


DATA ST-JRFACE
FORMAT
T h c d i s k d a t a s u r f a c ei s d i v i d e c li n t o c o n c e n t r i cb a n d s
o f c l a t ac a l l e dt r a c k s ( s e eF i g u r e 4 ) . [ , a c h d a t i r s u r f a c e
u s e st w o r n a g n e t i c c a d / w r - i t eh e a d s .o n e f o r t h e i n s i c l e
l
'Ihc
irac:ksanclone l'or the clutsictre tracks. rercording
s u r l a c co 1 t h e d i s k i s c l i v i c l e dn h a l l ' . A l l o d d n u m -
i
b c r e c l . r ; r c k s r e o n o n e s i d e o l ' t h e d i v i t l i n gI i n c a n d a l l
a
evern nunrhere,-'l trircks are on the o1her. The odd inclex
p o i n t s t a r t st h e o c l d t r a c : k s n c lt h e c v e n i n d e x s t a r t s
a
tireevcn. When thc lreacls re at a givenpositior.rhey
a t,
s c r v i c ef o u r t r a c k s : o n e o d d , o n e : v e n , o n e i n s i c l ea n d
e .
one otrtsiclc.
DATA n*TODULE
TYPES I n t h e 3 3 4 l J - 3 5t l : r t an r < l d u l ch e t r a c k s u n c l c rt h e t h r e e
t
'fhe o u t s i d eh e i r d sa n c lt h o s e u n d e r t h e t h r e e i n s i c l e e a d s
h
3 3 4 0 n r o c l e l s s c rh c I B M 3 3 4 u D a t a N , l o d u l c s r r
u t a
-f f o r m a c y l i n d e r . A l l o d d n u m b e r r c dr a c k sa r e o n o n e
t
s t o r a g cm e r J i u r n . h r e e t y p c s a r e a v o i l i l b l e : t h e 3 3 4 l J
M o d c l 3 5 w i t h a b o r r t3 5 m i l l i o n b y t e s o f s t o r a q e " h e t s i d eo f t h e t h r e e d i s k s a r r c t h e e v e n t r a c k so n t h e o t h e r
l
3 3 4 1 1 o c l c l7 0 w i t h a b o u t 7 0 m i l l i o r rt ' r y i e s l ' s t o r a g e .
M o s i d c . I n a s i n g l ed r i v e r e v o l u t i o ne a c h h t : a cc o v e r st w < r
l
a n c l t h e 3 3 4 l ; iM o d e l 7 0 F r v i t h a b o u t 7 0 r r r i l l i o nb y t e s t r a c k s ;o n e o c l d .a n d o n e e v e n . A l l c y l i n d e r sa r e
i n c l u d i n go n e - h a l f m i l l i o n h y t e s u n d c r i f i x u - h c a d s .
d c o n s e c r r t i v e ln u m b e r e dl o r a t o t a l o f 3 4 i t .
y
'fhe
M o c l t : l s 5 a n c l7 0 c a n b e f r c c l y t : x c h a n g e c ) n t h e
3 (l I ' h i : - 1 3 4 1 { - 7d a t a r n o d u l cc o n t a i r . rfs u r c l t s k s .J ' h e
0 o
-l3rtOclrivcs.but therNlclclel 7()[r can usc its l'ixed heacls t r a c k g c o m c t r y i s t h c s a m c a s t h a t o f t h e s m a l l e rd a t a
( ) n l v o n 3 - 1 , 1 c l r i v e s h a t l . r a v e e e n c o n v c r t