Bsi bs en 28630 3 1992 (2000) iso 8630 3 1987

BRITISH STANDARD BS EN 28630 3 1992 ISO 8630 3 1987 Incorporating Amendment Nos 0 and 1 Guide to Construction and use of 130 mm (5 25 in) flexible disk cartridges for data interchange, using modified[.]

1987

Incor por a ting

A mend ment Nos 0

a nd 1

The European Stand rd EN28 3 -3:19 2has the status of a

British Stand rd

U C 6 1.3 7.6

This British Stan ard,ha ing

b en pre ared u der the

directionof the Information

Systems Tech olo y Stan ards

Commite , was publshed

u derthe authority of the

Bo rdofBSI an comes

into fecton

3 Se temb r1 8

© BSI 0 -2 0

The folowing BSI references

relate to the work on this

stan ard:

Commite reference IST/ 4

Draft for comment8 /66 1 DC

ISBN 0 5 0 1 5 4 8

The prep ration of this British Stand rd was entrusted b the Information

Sy stems Tech olog y Stand rds Commit e ( IST/-) to Tech ical Commit e

IST/4, upon which the folowing bodies were represented:

Association for Pay ment Clearing Serv ices

British Computer Society

British Telecommu ications plc

Busines Equipment and Information Tech olog y Association

Dep rtment of Tra e and Industry ( National Phy sical La oratory )

HM Treasury ( Central Computer and Telecommu ications Ag ency )

Institute of Administrativ e Manag ement

Institute of Qual ty Assurance

Institution of Electrical Eng ine r

Institution of Electronic and Ra io Eng ine r

Institution of Mechanical Eng ine r

National Computing Centre Ltd

Post Ofice

Co pted member

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

19 2

819 Ju e 19 4 Indicated b a sidel ne in the marg in

Pag e

Annex B Procedure and equipment for measuring flux

National foreword

This Part of BS6 5 , prep red u der the direction of the Information Sy stems

Tech olog y Stand rds Commit e , is identical with ISO8 3 -3:19 7

“ Inf r ma tion pr oc s ing — Da ta inter cha nge on130mm (5.2 in) fl exibl e d isk

ca r tr id ge using mod ified fr equency mod ula tion r ecor d ing a t13 2 2ftpr a d ,

on80tr a cks on ea ch sid e — Pa r t3: Tr a ck f r ma t B fr80tr a cks”, publ shed b

the International Org anization for Stand rdization ( ISO)

In19 2the European Commit e for Stand rdization ( CEN) ac epted

ISO8 3 -3:19 7as European Stand rd EN28 3 -3:19 2 As a consequence of

implementing the European Stand rd this British Stand rd is ren mbered as

BSEN28 3 -3and any reference to BS6 5 -3should be rea as a reference to

BS EN28 3 -3 In 19 3 CEN ac epted ISO Technical Cor ig endum 1:19 2 to

ISO8 3 -3 as Amendment 1:19 3 to EN 28 3 -3

The purpose of this stand rd is to define those characteristic neces ary for

suc es ful d ta inter hang e using mag netic disks The information contained is

intended as a g uide to writing complete specifications for man facture,

pur hasing and/ or testing The text of the International Stand rd do s not ac ord

with the recommend tions for drafting product specifications g iv en in the ISO

Directiv es, or in BS0-3, but the BSI Tech ical Commit e consider the text is

useful as a g uide when disks are being des ribed or specified For this reason this

Part of BS6 5 has a diferent title fom the International Stand rd; it is is ued

as a British Stand rd g uide, and it should only be used as such It should not be

used on its own as a British Stand rd product specification, and, in p rticular, no

claims of complance with this Part of BS6 5 should be ma e

Term inolog y and c nventions The text of the International Stand rd has

be n a prov ed as suita le for publ cation as a British Stand rd without

dev iation Some terminolog y and certain conv entions are not identical with those

used in British Stand rds; at ention is drawn especialy to the folowing

For metric units the comma has be n used as a decimal marker In British

Stand rds it is cur ent practice to use a ful point on the b selne as the decimal

marker

W herev er the words “ part of ISO8 3 ” and “ ISO8 3 ” a pear, refer ing to this

stand rd, they should be rea as “ Part of BS6 5 ” and “ BS6 5 ” respectiv ely

Cros - referenc s

Inte national Stand rd Cor esp nding British Stand rd

ISO6 6:19 3 BS4 3 :19 5 Spe ifica tion fr UK7-bi cod ed

cha r a cter s t

( Identical, exer ising national options)

ISO202 :19 6 BS6 5 :19 7 Spe ifica tion fr cod e extension

te hnique fr Uni ed Kingd om7-bi a nd8-bi cod ed

cha r a cter s ts

( Identical

ISO4 7 :19 6 BS6 0 :19 7 Spe ifica tion f r str uctur e a nd r ul es fr

implementa tion o Uni ed Kingd om8-bi cod ed

cha r a cter s t

( Identical

ISO6 29:19 3 DD9 :19 4 Definiion o a d d itona l contr ol funct ons

fr cha r a cter -ima ging d evic s f r infr ma tion

pr oc s ing, using extend ed ISO7-bi a nd8-bi cod ed

cha r a cter s ts

( Identical

BS6 5 Guid e to constr uct on a nd us

o 130mm (5.2 in) flexible d isk ca r tr id ge f r d a ta

inter cha nge, using mod ified fr equency mod ul a tion

r ecor d ing a t13 2 2ftpr a d , on80tr a cks on ea ch sid e

A British Stand rd do s not purport to include al the neces ary prov isions of a

contract User of British Stand rds are responsible for their cor ect a pl cation

Com pl anc with a British Standard do s not of itselfc nfer im munity

f om leg al obl g ations

Inte national Stand rd Cor esp nding British Stand rd

ISO8 3 -1:19 7 Part1:19 8 Dimensiona l, physica l a nd ma gnetc

cha r a cter ist c

( Identical

ISO8 3 -2:19 7 Part2:19 8 Tr a ck f r ma t A fr7 tr a cks

( Identical

ISO929 :19 8 BS6 42 File str uctur e a nd la belling o flexibl e d isk

ca r tr id ge f r infr ma tion inter cha nge

Pa r t2:19 8Spe ifica tion fr va r ia ble file a lloca tion

str uctur e

( Identical

Sum mary of pag es

This document comprises a f ont cov er, an inside f ont cov er, p g es i to iv ,

theENtitle p g e, p g es 2 to 10, an inside b ck cov er and a b ck cov er

This stand rd has be n up ated ( se copy rig ht d te) and ma hav e ha

amendments incorporated This wi be indicated in the amendment ta le on the

inside f ont cov er

NORME EUROPÉENNE

Aug ust 1 9

UDC 6 1.3 7.6

Des riptor : Data proces ing, information inter hang , data recording de ices,mag netic disks, fle ible disks, fle ible disk cartridg s,

recording tracks,trackformat,sp cifications

Eng lish ver ion

(includes a mend ment A 1:19 3)

( ISO8 30-3:1 87)

Traitement de l’information — Échang e de

donné s sur cartouches à disquet es de1 0mm

( 5,2 in) uti isant un enreg istrement à

modulation de f équence modifié ( MFM)

à1 262 ftprad sur 80 pistes sur cha ue face

Partie3: Schéma de piste B pour80 pistes

(inclut l’amend ement A 1:19 3)

( ISO8 30-3:1 87)

Informationsverarb itung — Datenaustaus h

auf 1 0 mm ( 5,2 in) Disket en mit

modifizierter W echselta ts hrift b i

zweiseitig er Auf eichnung

mit1 262 Flus wechsel/ ra und80 Spuren

auf jeder Seite

Tei 3: Spurormat B für80 Spuren

( nthä l t Ä nd er ungen A 1:19 3)

( ISO8 3 -3:1 87)

This European Stand rd was a prov ed b CEN on19 2-0 -13 CEN member

are bou d to comply with the CEN/ CENELEC Internal Reg ulations which

stipulate the conditions for g iv ing this European Stand rd the status of a

national stand rd without any alteration

Up-to-d te lsts and bibl og ra hical references concerning such national

stand rds ma be obtained on a plcation to the Central Sec etariat or to any

CEN member

This European Stand rd exists in thre oficial v er ions ( Eng lish, French,

German) A v er ion in any other lang uag e ma e b translation u der the

responsibi ity of a CEN member into its own lang uag e and notified to the

Central Sec etariat has the same status as the oficial v er ions

CEN member are the national stand rds bodies of Austria, Belg ium,

Denmark, Finland, France, Germany , Gre ce, I eland, I eland, Italy ,

Luxembourg , Netherlands, Norway , Portug al, Sp in,Sweden, Switz rland and

United King dom

European Commit e for Stand rdization

Comité Europé n de Normalsation

Europ is hes Komite für Normu g

Central Se retariat: rue de Stas art 3 , B- 10 0 Brus els

© 19 2 Copy rig ht reserv ed to CEN member

Ref No EN28 3 -3:19 2 +A 1:19 3 E

For word

The Tech ical Board has decided to submit the

International Stand rd 8 3 -3:19 7 Infr ma tion

pr oc s ing — Da ta inter cha nge on 130mm (5.2 in)

flexible d isk ca r tr id ge using mod ified fr equency

mod ula tion r ecor d ing a t 132 2 ftpr a d , on 80 tr a cks

ea ch sid e — Pa r t 3: Tr a ck fr ma t B fr 80 tr a cks for

Formal Vote The stand rd was ac epted

This European Stand rd shal be g iv en the status of

a national stand rd, either b publ cation of an

identical text or b endor ement, at the latest b

February 19 3 and conflcting national stand rds

shal be withdrawn at the latest b February 19 3

According to the CEN/ CENELEC Common Rules

the fol owing cou tries are bou d to implement this

stand rd:

Austria, Belg ium, Denmark, Finland, France,

Germany , Gre ce, I eland, I eland, Italy ,

Luxembourg , Netherlands, Norway , Portug al,

Sp in, Sweden, Switz rland, United King dom

For word to Am endm ent A1

The Tech ical Board decided to submit the draft

Amendment Inf r ma tion pr oc s ing — Da ta

inter cha nge on130mm (5.2 in) fl exibl e d isk

ca r tr id ge using mod ified fr equency mod ul a tion

r ecor d ing a t132 2ftpr a d , on80tr a cks ea ch

sid e — Pa r t3: Tr a ck fr ma t B f r80tr a cks

( ISO8 3 -3:19 7, Tech ical Cor ig endum1:19 2),

to the Unique Acceptance Procedure ( UAP) The

result of the Unique Acceptance Procedure was

positiv e

For the time being , this document exists only in

Eng lish

This European Stand rd shal be g iv en the status of

a national stand rd, either b publ cation of an

identical text or b endor ement, at the latest b

Ma 19 4, and conflcting national stand rds shal

be withdrawn at the latest b Ma 19 4

In ac ord nce with the CEN/CENELEC Internal

Reg ulations, the fol owing cou tries are bou d to

implement this European Stand rd: Austria,

Belg ium, Denmark, Finland, France, Germany ,

Gre ce, I eland, I eland, Italy , Luxembourg ,

Netherlands, Norway , Portug al, Sp in, Sweden,

Switz rland and UnitedKing dom

0 Introduction

ISO8 3 specifies the characteristic

of13 mm( 5.25in) flexible disk cartridg es

recordedat13262 ftpra , using modified fequency

modulation ( MFM) recording , on8 tracks on each

side

ISO8 3 -1 specifies the dimensional, phy sical and

mag netic characteristic of the cartridg e, so as to

prov ide phy sical inter hang ea i ty betwe n d ta

proces ing sy stems

ISO8 3 -2 specifies an alternativ e track format for

d ta inter hang e

ISO8 3 -1 and ISO8 3 -3, tog ether with the

la el ing s heme specified in ISO929 , prov ide for

ful d ta inter hang e betwe n d ta proces ing

systems

1 Scope and field ofappl cation

This p rt of ISO8 3 specifies the qualty

of ecorded sig nals, the track lay out,

andatrackformat to be used

on13 mm ( 5.25in), 13262 ftpra flexible disk

cartridg es intended for d ta inter hang e betwe n

d ta proces ing sy stems

NOT Numeric v lues in the SI an / or Imp rial me surement

system in this p rt of ISO8 3 ma ha e b en rou ded of an

therefore are consistent with,but not e actly e ual to,e ch other

Either system ma b used, but the two should b neither

intermix d nor re-conv rted.The original design was made using

Imp rial u its an further de elo ments were made using SI

u its

2 Conform ance

A flexible disk cartridg e shal be in conformance

with ISO8 3 when it me ts al the requirements

of p rts 1and3of ISO8 3

NOT ISO9 9 sp cifies a field in the v lume la el

ISO6 6, Inf r ma tion pr oc s ing — ISO7-bi cod ed

cha r a cter s t f r infr ma tion inter cha nge

ISO202 , Infr ma tion pr oc s ing — ISO7-bi

a nd8-bi cod ed cha r a cter s ts — Cod e extension

te h ique

ISO4 7 , Infr ma tion pr oc s ing — ISO8-bi cod e

f r infr ma tion inter cha nge — Str uctur e a nd r ules

f r impl ementa tion

ISO6 29, Infr ma tion pr oc s ing — ISO7-bi

a nd8-bi cha r a cter s ts — A d d itona l contr ol

funct ons f r cha r a cter -ima ging d evic s

ISO929 , Infr ma tion pr oc s ing — Vol ume a nd

file str uctur e o flexible d isk ca r tr id ge f r

infr ma tion inter cha nge

4 General r quirem ents

4.1 Mode of re ording

The mode of recording shal be Modified Frequency

Modulation ( MFM) for which the conditions are

a) a flux transition shal be writ en at the centre

of each bit cel containing a ONE;

b) a flux transition shal be writ en at each cel

bound ry betwe n consecutiv e bit cel s

containing ZEROs

Exceptions to this are defined in 4.12

4.2 Track lo ation toleranc of the re orded

flexible disk cartridg e

The centrelnes of the recorded tracks shal be

within±0,0 25mm ( ±0.0 1 6 in) of the nominal

positions, ov er the rang e of operating env ironment

specified in ISO8 3 -1

4.3 Re ording ofset ang le

At the instant of writing or rea ing a mag netic

transition, the transition shal hav e an ang le

of0°±18½ with the ra ius

N T As tracks ma b writ en an o erwriten at e tremes of

the tolerances giv n in 4.2 an 4.3, a b n of old information ma

b left at one edg e of the newly writen data an would constitute

u wanted noise when re ding I is therefore neces ary to trim

the edg s of the tracks b erasure after writing

4.4 Density of re ording

4.4.1 The nominal density of recording shal

be13262 ftpra

1)

The resulting nominal bit cel

leng th is7 ,54ra

4.4.2 The long -term av erag e bit cel leng th shal be

the av erag e bit cel leng th measured ov er a sector It

shal be within±3,0% of the nominal bit cel

leng th

4.4.3 The short-ter m av erag e bit cel leng th,

refer ed to a p rticular bit cel , shal be the av erag e

of the leng ths of the preceding eig ht bit cel s It shal

be within±8% of the long -term av erag e bit cel

leng th

4.5 Flux transition spacing ( Se Fig ure 1)

The instantane us sp cing betwe n flux transitions

ma be influenced b the rea ing and writing

proces , the bit seq uence recorded ( pulse c owding

efects) and other factor

The locations of the transitions are defined as the

locations of the peaks in the sig nal when rea ing

Tests should be car ied out using a peak-sensing

rea ampl fier ( se Annex B and Annex C)

4.5.1 The sp cing betwe n the flux transitions in a

sequence of ONEs shal be betwe n8 % and1 0%

of the short-term av erag e bit cel leng th

1)

Flux transitions p r radian

4.5.2 The sp cing betwe n the flux transition for a

ONE and that betwe n two ZEROs preceding or

fol owing it shal be betwe n13 % and16 % of the

short-term av erag e bit cel leng th

4.5.3 The sp cing betwe n the flux transitions of

two ONEs sur ou ding a ZERO shal le

betwe n18 % and2 5% of the short-term av erag e

bit cel leng th

4.6 Averag e Sig nal Am pl tude

For each side the Av erag e Sig nal Ampltude on any

track ( se ISO8 3 -1) of the inter hang ed flexible

disk cartridg e shal be les than16 % of SRA

1f and

more than4 % of SRA

2f

4.7 Byte

A by te is a g roup of eig ht bit-positions, identified

B1to B8 The bit in each position is a ZERO or a

ONE

4.8 Se tor

All tracks shal be div ided into15sector s

of51 by tes

4.9 Cylnder

A p ir of tracks, one on each side of the disk,hav ing

the same track number

4.10 Cyl nder Number

The Cy linder Number shal be a two-dig it n mber

identical with the track n mber of the tracks of the

cy linder

4.1 Data ca acity of a track

The d ta ca acity of a track shal be76 0by tes

4.12 Hex de im al notation

Hex decimal notation shal be used hereafter to

denote the fol owing by tes:

( 00) for ( B8to B1) = 0 0 0 0

( 01) for ( B8to B1) = 0 0 0 01

( 02) for ( B8to B1) = 0 0 0 10

( 4E) for ( B8to B1) = 010 1 10

( FE) for ( B8to B1) = 1 1 1 10

( FB) for ( B8to B1) = 1 1 101

( A1) 2)

for (B8to B1) = 1010 0 1

In by te ( A1)

2)

the bou d ry transition betwe n

B3and B4is mis ing

4.13 Er or Dete tion Character (EDC)

The two EDC by tes are hardware-g enerated b

shifting serialy the relev ant bits, specified later for

each p rt of the track, throug h a16-bit shift reg ister

des ribed b the g enerator poly nomial:

X 1

+X 1

+X 5

+1

( Se also Annex A.)

5 Track layout

After format ing ,there shal be15usa le sector on

each track

The lay out of each track shal be as shown in

Fig ure 2

5.1 Index Ga

At nominal density ,this field shal comprise not les

than32 by tes and not more than14 by tes, the

content of which is not specified except that it shal

not contain an ( A1)*-by te

W riting the Index Ga is started when the index

hole is detected Any of the fir t16by tes ma

become i ldefined due to subsequent ov erwriting

5.2 Se tor Identifier

The lay out of this field shal be as shown in Ta le 1

5.2.1 Id ent ifier Mark

This field shal comprise16by tes:

1 ( 00) by tes

3 ( A1)*-by tes

1 ( FE) by te

2)

Flux transitions p r radian

Fig ure 1