1、 INCITS/ISO/IEC 9293-1994 (R2001)(formerly ANSI/ISO/IEC 9293-1994 (R2001)for Information Technology -Volume and File Structureof Disk Cartridgesfor Information InterchangeAmericanNationalStandardApproval of an American National Standard requires review by ANSI that therequirements for due process, c
2、onsensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests. Substantial agreement means much more than a sim
3、plemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards is completely voluntary; their existencedoes not in any respect preclude anyone, whether he has
4、 approved the standardsor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not develop standards and will inno circumstances give an interpretation of any American National Standa
5、rd.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretariat orsponsor whose name appears on the title page of this stan
6、dard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standard. Purchasers of American National Standards may receive curre
7、ntinformation on all standards by calling or writing the American National StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1996 by Information Technology Industry Council (ITI)All rights reserved.These materials are subject t
8、o copyright claims of International Standardization Organization (ISO),International Electrotechnical Commission (IEC), American National Standards Institute (ANSI), andInformation Technology Industry Council (ITI). Not for resale. No part of this publication may bereproduced in any form, including
9、an electronic retrieval system, without the prior written permission of ITI.All requests pertaining to this standard should be submitted to ITI, 1250 Eye Street NW, Washington, DC20005.Printed in the United States of AmericaANSI/ISO/IEC 9293-l 994 American National Standard for Information Technolog
10、y - Volume and File Structure of Disk Cartridges for Information Interchange Secretariat Information Technology Industry Council Approved April 8, 1998 American National Standards Institute, Inc. . i-y.-_- - - ._ _ _ _-_ _-.- I _._. ._ _i._ -_*- -yi_dw-al.-im -“sin-, * coEtents Section 1 - General l
11、S=V 2 Conformance 2.1 Conformance of an FDC 2.2 Conformance of an information processing system 3 Normative references 4 Definitions 4.1 byte 4.2 data field of a sector 4.3 data interchange standard 4.4 defective sector 4.5 descriptor 4.6 PDC 4.7 file 4.8 formatting 4.9 implementation 4.10 initializ
12、ation 4.11 ODC 4.12 originating system 4.13 receiving system 4.14 sector 4.15 physical track 4.16 user 4.17 fixed-length record 4.18 rewrd 4.19 segment 4.20 segmented record 4.21 variable-leqth record 5 Notations 5.1 Decimal and hexadecimal notations 5.2 Other notations 53 Capital letters Section 2
13、- Requirements for the medium 6 Volume structure 6.1 Arrangement of data on an FDC 5 5 65.1 FDC parameters 6.13 Physical Addresses 6.13 Logical Sector Number 6.1.4 System Area and Data Area 6.15 Parameters of the Volume Structure 6.2 Arrangement of the Data Area 6.2.1 Clusters 6 6.2.2 Status of clus
14、ters 6 63 Arrangement of the System Area 6.3.1 FDC Descriptor and space for system use 63.2 Pile Allocation Table (FAT) 6.33 Root Directory 6.3.4 Size of the System Area 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 6.4 Files 8 6.4.1 File Space 6.43 Relation to clusters 6.4.3 File length 6.5 Sub-d
15、irectories 7 Content of a file 8 Recording of descriptor fields 8.1 Numerical values in one-byte fields 8.2 Numerical values in two-byte fields 8.3 Numeric values in four-byte fields 8.4 Pairs of 12-bit integers 8.5 Character set and coding 8.6 Justification of characters 8 8 8 9 FDC Descriptor 9.1
16、FIX! Descriptor and Extended FDC Descriptor layout 9.2 FDC Descriptor and Extended FDC Descriptor fields 9.21 Field reserved for system use (BP 1 to 3) 9.22 Creating System Identifier (BP 4 to 11) 9.2.3 Sector Size (BP 12 and 13) 9U Sectors per Cluster (BP 14) 9.25 Reserved Sector Count (BP 15 and 1
17、6) 9.26 Number of FATS (BP 17) 9.2.7 Root Directory Entries (BP 18 and 19) 9.2.8 Total Sectors (BP 20 and 21) 9.2.9 Medium Identifier (BP 22) 93.10 Sectors per FAT (BP 23 and 24) 93.11 Sectors per Track (BP 25 and 26) 92.12 Number of Sides (BP 27 and 28) 93.13 Field reserved for future standardizati
18、on (FDC Descriptor BP 29 and 30) 93.14 Field reserved for system use (Extended FDC Descriptor BP 29 to 32) 93.15 Total Sectors (Extended FDC Descriptor; BP 33 to 36) 93.16 Field reserved for system use (Extended FDC Descriptor BP 37) 93.17 Field reserved for future standardixation (Extended FIX Desc
19、riptor BP 38) 9.2.18 Extended Boot Record Signature (Extended FDC Descriptor BP 39) 9.2.19 Volume ID Number (Extended FDC Descriptor BP 40 to 43) 93.20 Volume Label (Extended FDC Descriptor BP 44 to 54) 93.21 File System Type (Extended FIX Descriptor BP 55 to 62) 9.2.22 Field reserved for system use
20、 (FDC Descriptor BP 3 1 to 5 12; Extended FDC Descriptor BP 63 to 5 12) 10 File Allocation Table 10.1 Format Identifier 14 10.2 FAT entries 14 10.2.1 FAT entry size 10.2.2 Number of FAT entries 10.2.3 FAT entry values 10.24 Maximum Cluster Number (%f%) 10.3 Number of sectors in each FAT 10.4 Recorde
21、d form of the FAT 14 14 14 14 11Filedinxtories 15 15 15 11.1characteristics 15 113Direamy entrytypes 15 11.3 General definition of Directory Entry fields 16 8 9 9 9 9 9 9 9 10 10 10 11 11 11 11 11 12 12 12 12 12 12 l2 12 12 12 12 13 13 13 13 13 13 13 13 . . . Ill 11.3.1Name (BP lto8) 16 11.33 Name E
22、xtension (BP 9 to 11) 16 11.33 Attributes (BP 12) 16 113.4 Reserved Field (BP 13 to 22) 17 113.5 Tie Recorded (BP 23 and 24) 17 113.6 Date Recorded (BP 25 and 26) 17 113.7 Stzting Cluster Number (BP 27 and 28) 17 113.8 File Length (BP 29 to 32) 17 11.4 File Entry 17 11.4.1 Name (BP 1 to 8) 17 11.43
23、Name Extension (BP 9 to 11) 17 11.43 Attributes (BP 12) 17 11.4.4 Reserved Field (BP 13 to 22) 18 11.45 Time Recorded (BP 23 and 24) 18 11.4.6 Date Recorded (BP 25 and 26) 18 11.4.7 Starting Cluster Number (BP 27 and 28) 18 11.4.8 File Length (BP 29 to 32) 18 11.5 Volume Label Entry 18 11.5.1 Name a
24、nd Name Extension (BP 1 to 11) 18 11.53 Attributes (BP 12) 18 11.53 Reserved Field (BP 13 to 22) 18 11.5.4 Time Recorded (BP 23 and 24) 18 11.55 Date Recorded (BP 25 and 26) 18 11.5.6 Starting Cluster Number (BP 27 and 28) 18 11.5.7 File Length (BP 29 to 32) 18 11.6 Sub-dir it incorporates the capab
25、ilities of new disk cartridges (both optical and magnetic). Annex A forms an integral part of this International Standard. Annexes B to F are for information only. Requests for interpretation, suggestions for improvement or addenda, or defect reports are welcome. They should be sent to the X3 Secret
26、ariat, Information Technology Industry Council, 1250 Eye Street, NW, Suite 200, Washington, DC 20005. This standard was processed and approved for submittal to ANSI by the Accredited Standards Committee on Information Technology, X3. Committee approval of this standard does not necessarily imply tha
27、t all committee members voted for its approval. At the time it approved this standard, the X3 Committee had the following members: James D. Converse, Chair Donald C. Loughry, Vice-Chair Kate McMillan, Secretary Organization Represented Name of Representative American Nuclear Society . . . . . . . .
28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Geraldine C. Main Sally Hartzell (Alt.) AMP, Inc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Edward Kelly Appl
29、e Computer, Charles Brill (Alt.) Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . David K. Michael AT b) There will be no limit on the number of individual files on a disk, within the overall limitation of available space for hold
30、ing files. Any file can be extended whenever required. The characteristics are advantageous for: a) Interchange of sets of text files or of small files, or of multiple-part document files; b) Interchange of any file when sender and recipient wish to carry out frequent update of the file between inte
31、rchange cycles, for example files of commercial transactions. Since the publication of the lirst version of this International Standard, many types of high capacity Flexible Disk Cartridges (FDCs) and Optical Disk Cartridges (ODCs) have come in use. All the descriptions (except annex B) of an FDC, t
32、hroughout this International Standard, can be applied to an ODC as well. It is intended that existing file systems for FDCs, possibly slightly modified, are applicable to ODCs. ODC specific volume and file structure standards are, e.g., ISOlIEC 13346 and ISO/IEC 13490. This International Standard is
33、 applicable to the new types of storage media because of revision at the following points: 4 Addition of the extended FDC Descriptors (clause 9) to the existing FDC Descriptors; b) Adoption of 16-bit File Allocation Table (FAT) entries (10.2) in addition to the existing 1Zbit FAT entries; cl Obsolet
34、ion of the Medium Identifier field (table 3 and subclause 9.2.9) because available values are exhausted and the field is no more used. . . . VIII AMERICAN NATIONAL STANDARD ANSlllSOllEC 9293-l 994 American National Standard for Information Technology - Volume and File Structure of Disk Cartridges fo
35、r Information Interchange Section 1 - General 1 Scope This International Standard specifies the volume and file structure of disk cartridges for the interchange of information between users of information processing systems. It also specifies an optional record structure. Note - All the descriptions
36、 (except those in annex B) of Flexible Disk Cartridges (FDC) can be applied to Optical Disk Cartridges (ODC) as well This International Standard is applicable to various types of disk cartridges including those identified in clause 3, and other types which may be the subject of future International
37、Standards. This Ihtemational Standard specifies the location of files of information on an FDC and also specifies a set of recorded descriptors which identifies: - the files which may be interchanged; - the locations of the files; - the attributes of the files; - the location of unused space for rec
38、ording on the FDC; - the location of defective recording space on the FDC; - the attributes of the FDC and of the descriptors recorded on it. This International Standard also specifies requirements for the processes which are provided within information processing systems to enable information to be
39、 interchanged between different systems, utilizing recorded FDCs as the medium of interchange. For this purpose it specifies the functions within systems which are intended to originate or to receive FDCs which conform to this International Standard. This International Standard provides a method for
40、 the allocation of space that is independent of the number of files which are recorded on the volume. It also enables the sizes of the recorded files to be expanded or contracted during processing, subject only to the availability of unused recording space when needed. The content and organization o
41、f the files are not specified by this International Standard and are subject to agreement between the originator and the recipient of the interchanged FDC. 2 Conformance 2.1 Conformance of an FDC An FDC shall be in conformance with this International Standard when all information recorded on it conf
42、orms to the requirements of section two of this International Standard. A prerequisite to such conformance is the conformance of the FDC to the appropriate International Standard for data interchange by means of FDCs. 2.2 Conformance of an information processing system An information processing syst
43、em shall be in conformance with this International Standard if it meets the set of requirements specified in section three of this Intemational Standard either for an originating system, or for a receiving system, or for both types of system. A statement of conformance shall identify which of these
44、sets of requirements is met by the system. Conformance with this International Standard does not require conformance with section 4. 1 1 ISOAEC 9293: 1994 Q 0 ISOIIEC 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of thi
45、s International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to ents based on this International Standard are encouraged to investigate the possibility of applying the most recent n of the standards listed below. Members of
46、 IEC and IS0 maintain registers of currently valid International Standards. ISOhEC 6461991, IS0 7487-1:1993, Information rechnology - IS0 7-W coded character set for information interchange. Information technology - Data interchange on 130 mm (5,25 in) flexible disk cartridges using modified frequen
47、cy modulation recording at 7 958ftprad, I,9 tpmm (48 tpi), on both sides Part I: Dimensional, physical and magnetic chaacteristics. IS0 7487-3: 1986, IS0 7665: 1983, IS0 8378-1:1986, IS0 8378-3:1986, IS0 8630-1:1987, IS0 8630-3:1987, IS0 8860-1:1987, IS0 8860-2:1987, ISO/IEC 9171-1:1990, ISO/IEC 917
48、1-21990, ISO/IEC 9529-1:1989, ISOiIEC 9529-2: 1989, ISOAEC 10089:1991, ISO/IEC 10090:1992, ISO/IEC 10994: 1992, 2 Information processing - Data interchange on 130 mm (5,25 in) flexible disk cartridges using modifiedfrequency modulation recording at 7 958ftprad. I,9 tpmm (48 tpi), on both sides Parr
49、3: Track format B. Information processing - File structure and labelling of flexible disk cartridges for information interchange. Information processing - Data interchange on 130 mm (5,25 in) flexible disk cartridges using modified frequency modulation recording at 7 958frprad, 3,8 tpmm (96 tpi), on both sides - Part 1: Dimensional, physical and magnetic characteristics. Information processing - Data interchange on 130 mm (5,25 in) flexible disk cartridges using modifiedfrequency modulation recording at 7 958ftprad. 3,8 tpmm (96 tpi). on both sides Part 3: Track format B. I
