Bsi bs en 28630 2 1992 (2000) iso 8630 2 1987

BRITISH STANDARD BS EN 28630 2 1992 ISO 8630 2 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[.]

Incor por a ting

A mend ment Nos 0

The European Stand rd EN 28 3 -2:19 2 has 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 rd

ofBSI an comes

into efect on

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 comment 8 /66 1 DC

ISBN 0 5 0 1 5 3 X

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

8192 Ju e 19 4 Indicated b a sidel ne in the marg in

5 Track lay out after the fir t format ing for track 0 , side 0 5

6 Track lay out after the fir t format ing for al tracks other

7 Track lay out of a recorded flexible disk for d ta inter hang e 8

Annex B Procedure and equipment for measuring flux transition sp cing 1

National foreword

This Part of BS 6 5 , prep red u der the direction of the Information Sy stems

Tech olog y Stand rds Commit e , is identical with ISO8 3 -2:19 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 t132 2ftpr a d ,

on 80 tr a cks on ea ch sid e — Pa r t2: Tr a ck f r ma t A f r7 tr a cks”, publshed b

the International Org anization for Stand rdization ( ISO)

In 19 2 the European Commit e for Stand rdization ( CEN) ac epted

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

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

BSEN28 3 -2 and any reference to BS6 5 -2 should be rea as a reference to

BS EN28 3 -2 In19 3 CEN ac epted ISO Tech ical Cor ig endum1:19 2 to

ISO8 3 -2 as Amendment1:19 3 to EN28 3 -2

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 BS 0-3, 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 f om 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 ISO 8 3 ” and “ ISO 8 3 ” a pear, refer ing to this

stand rd, they should be rea as “ Part of BS 6 5 ” and “ BS 6 5 ” respectiv ely

Cros - referenc s

Inte national Stand rd Cor esp nding British Stand rd

ISO 6 6:19 3 BS 4 3 :19 5 Spe ifica tion fr UK7-bi cod ed cha r a cter

s t

( Identical, exer ising national options)

ISO 202 :19 6 BS 6 5 :19 7 Spe ifica tion f r cod e extension te h ique

fr Uni ed Kingd om 7-bi a nd 8-bi cod ed cha r a cter s ts

( Identical

ISO 4 7 :19 6 BS 6 0 :19 7 Spe ifica tion fr str uctur e a nd r ules f r

impl ementa tion o Unied Kingd om 8-bi cod ed cha r a cter

s t

( Identical

ISO 6 29:19 3 DD 9 :19 4 D efiniion o a d d itona l contr ol fu ctons f r

cha r a cter -ima ging d evic s fr inf r ma tion pr oc s ing,

using extend ed ISO 7-bi a nd 8-bi cod ed cha r a cter s ts

( Identical

ISO 7 6 :19 3 BS 6 42 Fil e str uctur e a nd la belling o fl exibl e d isk

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

Part 1:19 4 Spe ifica tion fr s quenta l fil e a lloca tion

str uctur e

( Identical

The Tech ical Commit e has rev iewed the prov isions of ISO 7 6 -2, to which

reference is ma e in the text, and has decided that they are ac epta le for use in

conju ction with this stand rd

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

BS 6 5 Guid e to constr ucton 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 t132 2 ftpr a d , on80tr a cks on ea ch sid e

ISO 8 3 -1:19 7 Part 1:19 8 D imensiona l , physica l a nd ma gnetc

cha r a cter ist c

( Identical

ISO 8 3 -3:19 7 Part 3:19 8 Tr a ck f r ma t B fr 80 tr a cks

( Identical

Sum m ary 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 es2 to14, an inside b ck cov er and a b ck cov er

This stand rd has be n up ated ( se copy right 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 interhang , data recording de ices, ma netic disks,fle ible disk cartridg s,recording

tracks, track format, sp cifications

Eng lish ver ion

(includ es a mendment A 1:19 3)

( ISO 8 30-2:1 87)

Traitement de l’information — Échang e de

donné s sur cartouches à disquet es de1 0mm

( 5,25 in) uti isant un enreg istrement à

modulation de f équence modifié ( MFM)

à1 262 ftprad sur 80 pistes sur cha ue face

Partie 2: Schéma de piste A pour 7 pistes

(inclut l ’a mend ement A1:19 3)

( ISO 8 30-2:1 87)

Informationsverarb itung — Datenaustaus h

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

modifizierter W echselta s hrift b i

zweiseitig er Auf eichnung mit 1 262

Flus wechsel/ ra und 80 Spuren aufjeder Seite

Tei 2: Spurormat A für 7 Spuren

( nthält Änder ungen A 1:19 3)

( ISO 8 30-2:1 87)

This European Stand rd was a prov ed b CEN on 19 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 EN 28 3 -2:19 2 + A 1:19 3 E

For word

The Tech ical Board has decided to submit the

International Stand rd 8 3 -2:19 7 Infr ma tion

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

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

mod ul a tion r ecor d ing a t132 2 ftpr a d ,on80 tr a cks

ea ch sid e — Pa r t 2: Tr a ck f r ma t A fr 7 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, UnitedKing 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 t 13 2 2 ftpr a d ,on 80 tr a cks ea ch sid e —

Pa r t 2: Tr a ck f r ma t A f r 7 tr a cks

( ISO 8 3 -2:19 7, Tech ical Cor ig endum 1:19 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

ISO 8 3 specifies the characteristic

of13 mm( 5.25in) flexible disk cartridg es recorded

at13262 ftpra , using modified fequency

modulation ( MFM) recording , on 8 tracks on each

side

ISO 8 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

ISO 8 3 -3 specifies an alternativ e track format for

d ta inter hang e

ISO 8 3 -1 and ISO 8 3 -2, tog ether with the

la el ing s heme specified in ISO 7 6 , 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

recorded sig nals, the track lay out, and a track

format 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 alues 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 1 and 2 of ISO8 3 and when it implements

one of the thre sector siz s specified in4.1

Data inter hang e is pos ible only when the

inter hang e p rties implement the same sector siz

NOT ISO7 6 sp cifies a field in the v olume la el in which

the implemented sector size is identified

ISO 6 6, Inf r ma tion pr oc s ing — ISO 7-bi cod ed

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

ISO 202 , Infr ma tion pr oc s ing — ISO 7-bi

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

te h ique

ISO 4 7 , Infr ma tion pr oc s ing — ISO 8-bi cod e

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

f r impl ementa tion

ISO 6 29, Infr ma tion pr oc s ing — ISO 7-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

ISO 7 6 -2, Inf r ma tion pr oc s ing — Da ta

inter cha nge on200mm (8 in) flexibl e d isk ca r tr id ge

using mod ified fr equency mod ula tion r ecor d ing

at13 2 2 ftpr a d ,1,9 tpmm (48 tpi, on both sid es —

Pa r t 2: Tr a ck fr ma t

ISO 7 6 , Infr ma tion pr oc s ing — File str uctur e

a nd la bell ing o flexibl e 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

4.1.1 Track 0 0 , side 0

The mode of recording shal be two-f equency where

the start of ev ery bit cel is a clock flux transition

AONE is represented b a d ta flux transition

betwe n two clock flux transitions

Exceptions to this are defined in4.12

4.1.2 Al l t racks ex cl ud ing t rack 0 0 , sid e 0

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 in4.12

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 ISO 8 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 in4.2 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 for track0 ,side0 is 1514ra , and for al the

other tracks it 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 ±2,0% of the nominal bit cel leng th

1)

Flux transitions p r radian

4.4.3 The short-term 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

The instantane us sp cing betwe n flux transitions

ma be influenced b the rea ing and writing

proces , the bit sequence 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 Fl ux t ransit ion spacing f r t rack 0 0 ,

side0 ( se Fig ure 1)

4.5.1.1 The sp cing betwe n two clock flux

transitions sur ou ding a d ta flux transition or

betwe n two d ta flux transitions sur ou ding a

clock flux transition shal be betwe n9 %

and14 % of the nominal bit cel leng th

4.5.1.2 The sp cing betwe n two clock flux

transitions not sur ou ding a d ta flux transition or

betwe n two d ta flux transitions sur ou ding a

mis ing clock flux transition shal be betwe n6 %

and1 0% of the nominal bit cel leng th

4.5.1.3 The sp cing betwe n a d te flux transition

and the preceding clock flux transition ( when not

mis ing ) or betwe n a clock flux transition and the

preceding d ta flux transition ( when not mis ing )

shal be betwe n4 % and7 % of the nominal bit

cel leng th

4.5.2 Fl ux t ransit ion sp cing f r al l t racks

ex cl uding t rack 0 0 , side 0 ( se Fig ure 2)

4.5.2.1 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

Fig ure 1

Fig ure 2

4.5.2.2 The sp cing betwe n the flux transition for a

ONE and that betwe n two ZEROs preceding or

folowing it shal be betwe n13 % and16 % of the

short-term av erag e bit cel leng th

4.5.2.3 The sp cing betwe n the two ONE flux

transitions sur ounding a ZERO bit cel shal l e

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

non-defectiv e track ( se ISO8 3 -1) of the

inter hang ed flexible disk cartridg e shal be les

than16 % of SRA

1fand more than 4 % of SRA

2f

4.7 Byte

A by te is a g roup of eig ht bit-positions, identified B1

to B8, with B8 most sig nificant and recorded fir t

The bit in each position is a ZERO or a ONE

4.8 Se tor

Track 0 , side 0 and side1is div ided into26 sector s

All other tracks of the flexible disk cartridg e shal

hav e the same n mber of sector , which can be 8,15

or 26

4.9 Cyl nder

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

the same track n mber

4.10 Cylnder Num ber

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

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 track0 , side 0 shal

Hex decimal notation is used hereafter to denote

the folowing by tes:

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 a 16-bit shift reg ister

des ribed b the g enerator poly nomial:

X1

+ X1

+ X5

+ 1

( Se alsoAnnex A.)

5 Track layout after the first

form at ing for track 00, side 0

After the fir t format ing there shal be26usa le

sector on the track The lay out of the track shal be

as shown inFig ure 3

where the clock transitions of B6, B5 and B4

are mis ing

( FB)* for ( B8 to B1) = 1 1 101

where the clock transitions of B6, B5 and B4

are mis ing

( F8)* for ( B8 to B1) = 1 1 10 0

where the clock transitions of B6, B5 and B4

are mis ing

where the bou d ry transition betwe n B3

and B4 is mis ing

( C2)* for ( B8 to B1) = 1 0 0 10

where the bou d ry transition betwe n B4

and B5 is mis ing