1、ECMA ECMA-207 94 3404593 0018937 Tb8 = ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA1207 DATA INTERCHANGE ON 90 mm FLEXIBLE DISK CARTRIDGES - 326 DATA TRACKS ON EACH SIDE - CAPACITY: 21 Mbytes - IS0 TYPE 305 - June 1994 ECMA ECHA-207 94 W 3404593 0038938 9T4 Free copies of this docu
2、ment are available from ECMA, European Computer Manufacturers Association, 114 Rue du Rhne - CH-1204 Geneva (Switzerland) Phone: +4122 735 36 34 Fax: 41 22 786 52 31 X.400. C=ch, A=arcom, =etma, O=genevanet, OU1 =ma, S=helpdesk Intemet: helpdeskecma.ch ECMA ECMA-207 94 3404593 0018939 830 ECMA EUROP
3、EAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA207 DATA INTERCHANGE ON 90 mm FLEXIBLE DISK CARTRIDGES = 326 DATA TRACKS ON EACH SIDE = CAPACITY: 21 Mbytes - IS0 TYPE 305 - June 1994 _ ECMA ECMA-207 94 3404593 0018940 552 = Brief history Technical Committee TC19 of ECMA began work on the standar
4、dization of flexible disk cartridges in 1974. As a result =MA has produced a set of standards for different types of flexible disk cartridges (FDC): 200 mm FDCs 130 mm FDCs 90 mm FCs ECMA-54 ECMA-59 EcMA-69 ECMA-66 ECMA-70 ECMA-78 ECMA-99 ECMA-100 ECMA- 125 ECMA-147 Standards ECMA-70, ECMA-78 and EC
5、MA-99 specify two different track formats. The fmt specifies FM recording in Cylinder 00 and is intended for use with the labelling system specified in Standard ECMA-91. The second tnck format, which is identical with that of Standard ECMA-100. specifies MFM recording on ail cylinders and is intende
6、d for use with the volume and file structure of Standard ECMA-107. Standard ECMA-100 was developed with a view to achieving a capacity of 1 Mbyte. Standard ECMA-125 is a further development of the me medium providing a capacity of 2 Mbytes. Standard ECMA-147 is still a further development of FDCs of
7、 90 mm, but with a magnetic layer of barium femte allowing for a higher recording density. This medium provides an unformatted capacity of 4 Mbytes. It has been adopted by ISO/EC/JTCl under the fast-track procedure as ISOEC 10994. The present ECMA Standard provides for the considerably higher capaci
8、ty of 21 Mbytes by specifying a format comprising magnetically recorded Data Tracks and Servo Tracks and using the 2-7 Run Length Limited recording method. This Standard has been accepted by the General Assembly of ECMA of June 1994. Section 1 - General Table of contents Page 1 2 2.1 2.2 2.3 3 4 4.1
9、 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 4.3 1 4.32 5 5.1 5.2 scope Conformance Flexible disk cartridge Generating systems Receiving systems References DefinitiOnS Average Signal Amplitude case Data Sect
10、or Data Tracks direction of rotation disk Error Correcting Code (ECC) Error Detecting Code (EDC) flux transition frequency hub Index Inner Zone Input bit Line of Access of the head liner Master Standard Reference Flexible Disk Camidge Outer Zone peak value Primary Identification hole Reference Field
11、 Secondary Identification hole Secondary Standard Reference Flexible Disk Cartridge Sector Block sector servo Servo Sector Servo Track shutter Side Standard Reference Amplitude Test Recording Current Typical Field write-inhibit hole Conventions and Notations Representation of numbers Names 1 1 1 1 1
12、 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 6 Acronyms 4 7 General description 7.1 Drawings 7.2 Main elements 7.3 Description 7.4 Marking of the FDC Section 2 - Environments, mechanical and physical characteristics 8 General requirements 8.1 Environment and transportation 8.
13、1.1 8.1.2 8.1.3 8.1.4 8.2 8.2.1 8.2.2 8.2.3 8.2.4 Testing environment Operating environment Storage environment Transportation Materials Case Liner Disk Hub 9 Dimensional characteristics 9.1 CaSe 9.1.1 9.1.2 9.1.3 9.1.4 9.1.5 9.1.6 9.1.7 9.1.8 9.1.9 9.1.10 Shape Thickness Hub access hole Locating bo
14、les Label area Head windows Write-inhibit hole Identification boles Profile of the shutter edge of the case Shutter 9.2 Liner 9.3 Disk 9.3.1 Diameter 9.3.2 Thickness 9.4 Hub 9.4.1 Dimensions 9.4.2 Hub orientation hoies 9.5 Optional handling notches 9.6 9.7 Compliance Interface between cartridge and
15、drive 10 Physical characteristics 1 O. 1 Flammability 10.2 10.3 10.4 Torque Coefficient of linear thermal expansion of the disk Coefficient of linear hygroscopic expansion of the disk 10.4.1 Starting torque 4 5 5 5 6 6 6 6 7 7 7 7 8 8 9 9 9 9 9 9 9 9 10 10 11 11 11 11 11 11 11 11 10.4.2 Running torq
16、ue Section 3 - Requirements for the unrecorded disk 11 Magnetic characteristics 1 1.1 Recording area 1 1.2 Track geometry 1 1.2.1 Number of tracks 1 1.2.2 Track number 11.2.3 Width of tracks 1 1.2.4 Track location 1 1.3 Functional testing 1 1.3.1 Test conditions 11.3.2 Typical Field 11.3.3 Average S
17、ignai Amplitude 11.3.4 Resolution 11 -3.5 Peak shift 11.3.6 Overwrite 11.3.7 Modulation 1 1.4 Track quality tests 1 1.4.1 Missing puise 1 1.4.2 Extra pulse 1 1.4.3 Requirement for tracks 1 1.4.4 Rejected cartridge Section 4 - Requirements for the interchanged disk 12 Recording of Data Tracks 12.1 Me
18、thod of recording 12.2 12.3 Recording offset angle 12.4 Density of recording Tolerances of the track locations 12.4,l 12.4.2 12.4.3 12.5 12.6 12.7 12.8 12.9 12.10 12.11 12.12 Nominal density of recording Long-term average Channel bit cell length Short-term average Channel bit cell length Flux transi
19、tion spacing Average Signal Amplitude Byte Data Sector Cylinder Cylinder number Data capacity of a track Hexadecimal notation 13 Disklayout 13.1 Layout of a Data Sector 13.1.1 Compensation field 13.1.2 Sector Identifier 13.1.3 Identifier Gap 13.1.4 Data Block 13.1.5 DataBlock Gap 12 12 12 12 12 12 1
20、2 12 12 13 13 14 14 14 14 14 14 15 15 15 15 15 15 15 15 16 16 17 17 17 17 17 17 17 17 17 18 18 18 18 20 20 20 21 21 22 ECHA ECHA-207 94 W 3404593 0018944 1T8 = - iv - 13.1.6 Defective Data Sector 13.2 Data Tracks 13.2.1 Data Tracks for user 13.2.2 13.2.3 Data Tracks for the management of defective D
21、ata Sectors Data Tracks for servo recovery 13.3 Coded representation of data 14 General requirements for recording Servo Tracks 14.1 Method of recording 14.2 Servo Tracks 14.2.1 Number of Servo Tracks 14.2.2 Width of Servo Tracks 14.2.3 Servo Track location 14.3 14.4 Average Signal Amplitude of serv
22、o data Displacement due to fluctuations of signai amplitude of servo data 15 Layout of the Servo Track 15.1 Layout of the Servo Sector 15.1.1 Servo Identifier 15.1.2 Servo data 16 Relative position of Data Tracks and Servo Tracks Annexes A - Cartridge distortion test gauge B - Measurement of light t
23、ransmittance C - Testforcompliance D - Method for measuring the effective track width E - Head and read amplifier for functional testing F - Method of measuring peak shift G - Method for measuring overwrite H - Procedure and equipment for measuring flux transition spacing J - The disposal of the def
24、ective Data Sector K - Method for measuring the eccentricity of Servo Tracks L - Method of measuring the offset between Data Tracks and Servo Tracks M - Torquemeasurements N - Data separators for decoding 2-7 RLL recording P - EDCImplementation 23 23 23 23 23 23 23 23 23 23 23 24 24 24 24 26 26 26 2
25、7 33 35 39 41 43 45 49 51 53 55 57 59 61 63 ECMA ECMA-207 94 3404593 OOL5 034 W -v- Q - ECCImplemenation R - Servo Track recording conditions S - Method for measuring the displacement of the head due to amplitude fluctuations of servo data T - Institute supplying Secondary Reference Flexible Disk Ca
26、rtridges 65 67 69 71 ECMA ECMA-207 74 = 3404573 OOLB74b T70 Section 1 - General 1 2 2.1 23 23 3 4 4.1 4.2 Scope This ECMA Standard specifies the Characteristics of 90 mm flexible disk cartridges (FDC) of 21 Mbytes formatted capacity, recorded at 31 831 ftprad in the Inner Zone and 47 747 ftprad in t
27、he Outer Zone with sector servo tracking on 326 data tracks on each side, using 2-7 RLL recording. It specifies the mechanical, physical and magnetic characteristics of the cartridge, so as to provide physical interchangeability between data processing systems. It also specifies the method of record
28、ing, the quality of recorded signals, the track layouts and the track formats of data tracks and servo tracks. Such flexible disk cartridges are identified as IS0 Type 305. Together with a standard for volume and file structure, for instance Standard ECMA-107, this Standard provides for full data in
29、terchange between data processing systems. Conformance Flexible disk cartridge A 90 mm flexible disk cartridge shall be in conformance with this ECMA Standard if it meets all the mandatory requirements specified herein. Generating systems A system generating an FDC for interchange shall be entitled
30、to claim conformance with this ECMA Standard if ail recordings on the flexible disk meet the mandatory requirements of this ECMA Standard. Receiving systems A system receiving an FDC for interchange shall be entitled to claim full conformance with this ECMA Standard if it is able to handle any recor
31、ding made on the flexible disk according to this ECMA Standard. References The following standards contain provisions which, through reference in this text, constitute provisions of this ECMA Standard. At the time of publication, the editions indicated were valid. Ail standards are subject to revisi
32、on, and parties to agreements based on this ECMA Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below ECMA- 107 ( 1985) ECMA- 1 29 ( 1 994) IS0 683-13: 1986 ISOIEC 9983: 1989 Volume and File Structure of Flexible Disk Cartridges fo
33、r Information Interchange Safety of Information Technology Quipment Heat treatable steels, alloy steels and free-cutting steels - Part 13: Wrought stainless steels Information processing systems - Designation of unrecorded flexible disk cartridges DefllitiOIlS For the purposes of this Standard, the
34、following definitions apply. Average Signai Amplitude The Average Signal Amplitude for a track is the arithmetically averaged value of the output voltages measured peak-to-peak over the whole track. case A protective enclosure including a shutter mechanism, identification holes and a write-inhibit h
35、ole. ECMA ECMA-207 94 3404593 O038947 907 -2- 43 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 Data Sector A sector comprising a Sector Identifier and a Data Block. Data Tracks A track on which data are recorded on Data Sectors. direction of rotation The direction of rotation shall
36、 be counter-clockwise when looking at Side O. disk A flexible disk which accepts and retains, on the specified side or sides, magnetic signals intended for input/output and storage purposes. Error Correcting Code (ECC) A mathematical procedure yielding bits used for the detection and correction of e
37、rrors. Error Detecting Cade (EDC) A mathematical procedure yielding bits used for the detection of emors. flux transition frequency The number of flux transition per second (ftps). NOTE 1 In this ECMA Stanhrd, thefrequencies to be used in the Outer Zone are indicated by the subscript OZ those to be
38、used in the Inner Zone are indicated by the subscript IZ (see 11.3.1.1 ). hub A centring and referencing device attached to the disk which allows torque to be transmitted to the disk. The hub is attached to the centre of the disk. It ensures centring of the disk on the drive shaft in a unique angula
39、r position. Index The signal generated in the index transducer of the drive by the drive spindle once per revolution, Inner Zone A group of tracks at the inner side of a disk that has two Data Sectors per Sector Block. Input bit Bits which represent input data. Line of Access of the head The straigh
40、t line described by the centre of the gap of the redwrite head when positioned from Track o00 to Track 325. liner Suitable material between the case and the disk to provide cleaning action and protection from abrasion. Master Standard Reference Flexible Disk Cartridge An FDC selected as the standard
41、 for reference fields, signal amplitudes, resolution, peak shift, and overwrite. The reference tracks are calibrated at 600 rpm. NOTE 2 This Master Standard has been established at the Reliability Centre for Electronic Components of Japan (RCJ), I- 1-12 Hachiman-Cho, Higashikurume-shi, Tokyo 203, Ja
42、pan. Outer Zone A group of tracks at the outer side of a disk that has three Data Sectors per Sector Block. ECMA ECMA-207 94 3404593 0018948 843 = -3- 4.18 4.19 4.20 4.21 4.22 4.23 4.24 4.25 4.26 4.21 4.28 4.29 4.30 4.31 peak value The zero to crest value of the output voltage of the read head. Prim
43、ary Identification hole A through-hole provided on the case to identi9 the FDC specified by this Standard. Reference Field The Typical Field of the Master Standard Reference Flexible Disk Camidge. There are two Reference Fields, one for each side. Secondary Identification hole An identification hole
44、 provided on Side O of the case to identify the FDCs specified by this Standard. Secondary Standard Reference Flexible Disk Cartridge A flexible disk cartridge the performance of which is known and stated in relation to that of the Master Standard Reference Flexible Disk Cartridge. NOTE 3 Secondary
45、Standard Reference Flexible Disk Cartridges can be ordered under part number JRM 622% from the Reliability Centre for Electronic Components of Japan (RCJ), 1-1-12 Hachiman-Cho, Higashihrume-Shi, Tokyo 203, Japan until the year 2004. (see annex T). It is intended that these be used for calibrating te
46、rtiary reference disks for use in routine calibration. Sector Block A block consisting of a Servo Sector followed by either two or three Data Sectors, and a Sector Block Gap. sector servo A method of position control, where head positioning information is recorded between Sector Blocks. Servo Sector
47、 A sector which has a Servo Identifier and servo data. Servo Track The track on which Servo Sectors are permanently recorded. shutter A device which uncovers the head windows upon insertion of the cartridge into a drive, and automatically covers them upon removal from the drive. Side Side O is the s
48、ide engaged by the spindle. Side 1 is the opposite side. Standard Reference Ampiitude The Standard Reference Amplitudes (SRAs) are the Average Signal Amplitudes derived from the reference tracks of the Master Standard Reference Flexible Disk Cartridge using the Test Recording Current. There are four
49、 SRAS, two for each side (see 11.3.1.1): SRA1 is the Average Signal Amplitude from a recording written using 3fOz at Track OOO. SRA2 is the Average Signal Amplitude from a recording written using 8fE at Track 325. Test Recording Current The current the relation of which to the Standard Reference current is defined for each zone and each flux transition frequency. Typical Field In the plot of the Average Signal Amplitude against the Recording Field at a specified recording density, the minimum field that causes an Average Signal Amplitude equal to 95% of the maximum Avera
