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1、8b30 PT*3 87 4853903 053b854 769 INTERNATIONAL STANDARD IS0 8630-3: 1987 - - - - TECHNICAL CORRIGENDUM I Published 1992-11-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MEXAYHAPOAHAR OPrAHkl3AqclR no CTAHAAPTbl3Al.lHH. ORGANISATION INTERNATIONALE DE NORMALISATION INTERNATIONAL ELECTROTECHNICAL
2、COMMISSION . MEWYHAPOAHAR 3JlEKTPOTEXHbl4ECKAR KOMMCCMR * COMMISSION ELECTROTECHNIOUE INTERNATIONALE Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 13 262 ftprad, on 80 tracks on each side - Part 3: Track format
3、 B for 80 tracks TECHNICAL CORRIGENDUM 1 Traitement de linformation - change de donnes sur cartouches disquette de 130 mm (5,25 in) utilisant un enregistrement MFM 13 262 fprad, modulation de frquence modifie sur 80 pistes sur chaque face - Partie 3: Schma de piste B pour 80 pistes RECTIFICATIF TECH
4、NIQUE 1 Technical corrigendum 1 to International Standard IS0 8630-3:1987 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology. Page 6 Subclause B.3.1 Line 2, replace 32 ms“ with “32 ps“. UDC 681.327.63 Ref. No. IS0 8630-3:1987/Cor.l:1992 (E) Descriptors : data processing,
5、 information interchange, data recording devices, magnetic disks, flexible disks, track formats, specifications. Q ISO/IEC 1992 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2
6、007 01:36:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 8630 PT 3-87 4BSL903 0063938 4 1 - INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAR OPrAHM3AuMR Il0 CTAHAAPTH3AuMM Information proces
7、sing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 13 262 ftprad, on 80 tracks on each side - Part 3: Track format B for 80 tracks Reference number IS0 8630-3 : 1987 (E) 54-35 IS0 8630-3 First edition 1987-06-15 Copyright Internation
8、al Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:36:31 MDTNo reproduction or networking permitted without license from IHS -,-,- 1 4 8 5 1 7 0 3 0063737 b m Foreword IS0 (the International Organization for Standard
9、ization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to
10、be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as Internati
11、onal Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 8630-3 was prepared by Technical Committee ISO/TC 97, Information processing s ysterns. Users should note that all Internati
12、onal Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1987 O Printed in Switzerland ii- Copyright International Organization for Sta
13、ndardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:36:31 MDTNo reproduction or networking permitted without license from IHS -,-,- . Contents Page O Introduction . 1 1 Scope and field of application 1 . 2 Conformance 1 3 References 1 4 Gen
14、eral requirements . 1 4.1 Mode of recording . 1 4.2 Track location tolerance of the recorded flexible disk cartridge . 1 4.3 Recording offset angle 2 4.4 Density of recording 2 4.5 Flux transition spacing 2 4.6 Average Signal Amplitude . 2 4.7 Byte 2 4.8 Sector 2 4.9 Cylinder . 2 4.10 Cylinder Numbe
15、r . 2 4.11 Data capacity of a track 2 4.12 Hexadecimal notation . 2 4.13 Error Detection Characters (EDC) . 3 5 Tracklayout . 3 5.1 IndexGap 3 5.2 Sector Identifier . 3 5.2.1 Identifier Mark 3 5.2.2 Address Identifier . 3 5.3 IdentifierGap . 4 . ill Copyright International Organization for Standardi
16、zation Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:36:31 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8630-3 : 1987 (E) . 5.4 Data Block 4 5.4.1 Data Mark . 4 5.4.2 DataField 4 5.4.3 EDC . 4 5.5 DataBlockGap . 4
17、5.6 TrackGap 4 6 Coded representation of data 4 6.1 Standards 4 6.2 Codingmethods 4 Ann exes A EDC implementation . 5 Procedure and equipment for measuring flux transition spacing . C Data separators for decoding MFM recording 8 6 6 iv Copyright International Organization for Standardization Provide
18、d by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:36:31 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 8630-3 : 1987 (E) Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartrid
19、ges using modified frequency modulation recording at 13 262 ftprad, on 80 tracks on each side - Part 3: Track format B for 80 tracks O Introduction IS0 8630 specifies the characteristics of 130 mm (5.25 in) flexible disk cartridges recorded at 13 262 ftprad, using modified frequency modulation (MFM)
20、 recording, on 80 tracks on each side. IS0 8630-1 specifies the dimensional, physical and magnetic characteristics of the cartridge, so as to provide physical inter- changeability between data processing systems. IS0 8630-2 specifies an alternative track format for data inter- change. IS0 8630-1 and
21、 IS0 8630-3, together with the labelling scheme specified in IS0 9293, provide for full data interchange between data processing systems. 3 References IS0 646, Information processing - IS0 7-bit coded character set for information interchange. . IS0 2022, Information processing - IS0 Fbit and 8-bit
22、coded character sets - Code extension techniques. IS0 4873, Information processing - IS0 8-bit code for infor- mation interchange - Structure and rules for implementation. IS0 6429, Information processing - IS0 7-bit and 8-bit character sets - Additional control functions for character- imaging devi
23、ces. IS0 9293, Information processing - Volume and fie structure of flexible disk cartridges for information interchange. 4 General requirements 1 Scope and field of application This part of IS0 8630 specifies the quality of recorded signals, the track layout, and a track format to be used on 130 mm
24、 (5.25 in), 13 262ftprad flexible disk cartridges intended for data interchange between data processing systems. . NOTE - Numeric values in the S I and/or Imperial measurement system in this part of IS0 8630 may have been rounded off and therefore are consistent with, but not exactly equal to, each
25、other. Either system may be used, but the two should be neither intermixed nor re-converted. The original design was made using Imperial units and further developments were made using S I units. 2 Conformance A flexible disk cartridge shall be in conformance with IS0 8630 when it meets all the requi
26、rements of parts 1 and 3 of IS0 8630. NOTE - IS0 9293 specifies a field in the volume label. 4.1 Mode of recording The mode of recording shall be Modified Frequency Modula- tion (MFM) for which the conditions are a) a flux transition shall be written at the centre of each bit cell containing a ONE;
27、b) a flux transition shall be written at each cell boundary between consecutive bit cells containing ZEROS. Exceptions to this are defined in 4.12. 4.2 Track location tolerance of the recorded flexible disk cartridge The centrelines of the recorded tracks shall be within f 0,042 5 mm ( f 0.001 67 in
28、) of the nominal positions, over the range of operating environment specified in IS0 8630-1. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:36:31 MDTNo reproduction or networking permitted
29、without license from IHS -,-,- IS0 8630-3 : 1987 (E) 4.3 Recording offset angle At the instant of writing or reading a magnetic transition, the transition shall have an angle of Oo f 18 with the radius. NOTE - As tracks may be written and overwritten at extremes of the tolerances given in 4.2 and 4.
30、3, a band of old information may be left at one edge of the newly written data and would constitute unwanted noise when reading. It is therefore necessary to trim the edges of the tracks by erasure after writing. 4.4 Density of recording 4.4.1 The resulting nominal bit cell length is 75,5 prad. The
31、nominal density of recording shall be 13 262 ftprad*. 4.4.2 The long-term average bit cell length shall be the average bit cell length measured over a sector. It shall be within f 3 , O % of the nominal bit cell length. 4.4.3 The short-term average bit cell length, referred to a par- ticular bit cel
32、l, shall be the average of the lengths of the preceding eight bit cells. It shall be within f 8 % of the long- term average bit cell length. 4.5 Flux transition spacing (see figure 1 The instantaneous spacing between flux transitions may be influenced by the reading and writing process, the bit sequ
33、ence recorded (pulse crowding effects) and other factors. The locations of the transitions are defined as the locations of the peaks in the signal when reading. Tests should be carried out using a peak-sensing read amplifier (see annexes B and Cl. 4.5.1 The spacing between the flux transitions in a
34、sequence of ONEs shall be between 80 % and 120 % of the short-term average bit cell length. 4.5.2 The spacing between the flux transition for a ONE and that between two ZEROS preceding or following it shall be between 130 % and 165 % of the short-term average bit cell length. 4.5.3 The spacing betwe
35、en the flux transitions of two ONEs surrounding a ZERO shall lie between 185 % and 225 % of the short-term average bit cell length. 4.6 Average Signal Amplitude For each side the Average Signal Amplitude on any track (see IS0 8630-1 1 of the interchanged flexible disk cartridge shall be less than 16
36、0 % of SRA,fand more than 40 % of SRA*? 4.7 Byte A byte is a group of eight bit-positions, identified BI to 88. The bit in each position is a ZERO or a ONE. 4.8 Sector All tracks shall be divided into 15 sectors of 512 bytes. 4.9 Cylinder A pair of tracks, one on each side of the disk, having the sa
37、me track number. 4.10 Cylinder Number The Cylinder Number shall be a two-digit number identical with the track number of the tracks of the cylinder. 4.11 The data capacity of a track shall be 7 680 bytes. Data capacity of a track 4.12 Hexadecimal notation Hexadecimal notation shall be used hereafter
38、 to denote the following bytes : (00) for (88 to BI) = 00000000 (01) for (B8 to BI) = 00000001 (02) for (B8 to BI) = 00000010 (4E) for (88 to BI) = 01001110 (FE) for (88 to BI) = 11111110 (FBI for (88 to BI) = 11111011 (Al)* for (88 to BI) = 101oooO1 In byte (Al)“ the boundary transition between 83
39、and B4 is missing. 1 1 1 O O 1 O 1 80 o / o to 120 o / o 130% to 165% 130/o to 165% 185% to 225% - - Figure 1 Flux transitions per radian 2 .,. -. . ._._ . -. . Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resal
40、e, 04/23/2007 01:36:31 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8630-3 : 1987 (E) 4.13 Error Detection Characters (EDC) 5.2.1 Identifier Mark The two EDC bytes are hardware-generated by shifting serially the relevant bits, specified later for each part of the tra
41、ck, through a 16-bit shift register described by the generator polynomial : 3 (Al)*-bytes This . 12 ()-bytes XI6 + X2 + x 5 + 1 1 (FE)-byte (See also annex A.) 5.2.2 Address Identifier 5 Track layout After formatting, there shall be 15 usable sectors on each track. This field shall comprise 6 bytes.
42、 5.2.2.1 Track Address This field shall comprise 2 bytes: The layout of each track shall be as shown in figure 2. a) Cylinder Number (Cl 5.1 Index Gap At nominal density, this field shall comprise not less than 32 bytes and not more than 146 bytes, the content of which is not specified except that i
43、t shall not contain an (Al)*-byte. Writing the Index Gap is started when the index hole is detected. Any of the first 16 bytes may become ill-defined due to subsequent overwriting. 5.2 Sector Identifier The layout of this field shall be as shown in table 1. This field shall specify in binary notatio
44、n the Cylinder Number from O0 for the outermost cylinder to 79 for the innermost cylinder. b) Side Number (Side) This field shall specify the side of the disk. On side O it shall be (00) on all tracks. On side 1 it shall be (01) on all tracks. 5.2.2.2 Sector Number (SI The 3rd byte shall specify in
45、binary notation the Sector Number from O1 for the first sector to 15 for the last sector. The sectors may be recorded in any order of their Sector Numbers. Table 1 Sector Identifier Identifier Mark Address Identifier Track Address s EDC 12bytes 3bytes 1 byte C Side 1 byte (00) (Al 1“ (FE) 1 byte 1 b
46、yte 1 byte (02) 2 bytes (00) or (01) .I I irirn -.- 1st sector 15th sector Figure 2 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:36:31 MDTNo reproduction or networking permitted without l
47、icense from IHS -,-,- IS0 8630-3 : 1987 (E) 5.2.2.3 4th byte The 4th byte shall always be a (02)-byte. 5.2.2.4 EDC These two bytes shall be generated as defined in 4.13 using the bytes of the Sector Identifier starting with the first (Al )*-byte (see 5.2.1) of the Identifier Mark and ending with the
48、 4th byte (see 5.2.2.3) of the Address Identifier. If the EDC is incorrect, then the sector is defective. IS0 9293 specifies the handling of defective sectors. 5.3 Identifier Gap This field shall comprise 22 initially recorded (4E)-bytes. 5.5 Data Block Gap This field shall comprise 84 initially recorded (4EI-bytes. These bytes may have become ill-defined due to overwriting. The Data Block Gap is recorded after each Data Block and it precedes the following Sector Identifier. After the last Data Block, it preced