1、INTERNATIONAL STANDARD ISO/IEC 15041 First edition 1997-04-I 5 Information technology - Data interchange on 90 mm optical disk cartridges - Capacity: 640 Mbytes per cartridge Technologies de /information - ichange de don - the environments in which the cartridges are to be operated and stored; - the
2、 mechanical and physical characteristics of the cartridge, so as to provide mechanical interchangeability between data processing systems; - the format of the information on the disk, both embossed and user-written; including the physical disposition of the tracks and sectors, the error correction c
3、odes, and the modulation method used; - the characteristics of the embossed information on the disk; - the magneto-optical characteristics of the disk, enabling processing systems to write data onto the disk; - the minimum quality of user-written data on the disk, enabling data processing systems to
4、 read data from the disk. This International Standard provides for interchange between optical disk drives. Together with a standard for volume and file structure, it provides for full data interchange between data processing systems. 1 ISO/IEC 15041: 1997 (E) OISO/IEC 2 Conformance 2.1 Optical disk
5、 cartridge (ODC): A claim of conformance with this International Standard shall specify the Type of the ODC. It shall be in conformance if it meets all mandatory requirements specified herein for that Type. 2.2 Generating system: A claim of conformance with this International Standard shall specify
6、which Type(s) is (are) supported. A system generating an ODC for interchange shall be in conformance with this International Standard if it meets the mandatory requirements of this International Standard for the Type(s) specified. 2.3 Receiving system: A claim of conformance with this International
7、Standard shall specify which Type(s) is (are) supported. A system receiving an ODC for interchange shall be in conformance with this International Standard if it is able to process any recording made on the cartridge in accordance with 2.1 on the Type(s) specified. 2.4 Compatibility statement: A cla
8、im of conformance with this International Standard shall include a statement listing any other International Standard supported by the system for which conformance is claimed. This statement shall specify the number of the Standard(s), the ODC type(s) supported (where appropriate) and whether suppor
9、t includes reading or both reading and writing. 3 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revi
10、sion, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 950: 199 I, Safety of info
11、rmation technology equipment, including electrical business equipment. 4 Definitions For the purposes of this International Standard, the following definitions apply. 4.1 band: Part of the Data Zone comprising a fixed number of consecutive physical tracks. 4.2 case: The housing for an optical disk,
12、that protects the disk and facilitates disk interchange. 4.3 Channel bit: The smallest element for the representation of data on a disk. It is recorded as either a space or a mark. Twelve channel bits are used to represent eight input bits. 4.4 clamping zone: The annular part of the disk within whic
13、h the clamping force is applied by the clamping device. 4.5 control track: A track containing the information on media parameters and format necessary for writing, reading and erasing the remaining tracks on the optical disk. 4.6 Cyclic Redundancy Check (CRC): A method for detecting errors in data.
14、4.7 defect management: A method for handling the defective areas on the disk. 4.8 DOW disk: A Magneto-Optical disk in which the new data can be written directly over old data by modulating the laser-intensity without reversing the magnetic field direction. 4.9 disk reference plane: A plane defined b
15、y the perfectly flat annular surface of an ideal spindle onto which the clamping zone of the disk is clamped, and which is normal to the axis of rotation. 4.10 embossed mark: A mark so formed as to be unalterable by magneto-optical means. 4.11 entrance surface: The surface of the disk on to which th
16、e optical beam first impinges. 4.12 Error Correction Code (ECC): An error-detecting code designed to correct certain kinds of errors in data. 4.13 field: A subdivision of a sector. 4.14 format: The arrangement or layout of information on the disk. 2 OISO/IEC ISO/IEC 15041:1997 (E) 4.15 fully embosse
17、d disk: An optical disk in which all data fields in the Data Zone are embossed. 4.16 fully rewritable disk: An optical disk in which the data in specified areas can be rewritten by an optical beam. 4.17 groove: See 4.21. 4.18 hub: The central feature on the disk which interacts with the spindle of t
18、he disk drive to provide radial centring and the clamping force. 4.19 interleaving: The process of allocating the physical sequence of units of data so as to render the data more immune to burst errors. 4.20 Kerr rotation: The rotation of the plane of polarization of an optical beam upon reflection
19、from the recording layer, as caused by the magneto-optical effect. 4.21 land and groove: A trench-like feature of the disk, applied before the recording of any information, and used to define the track location. The groove is located nearer to the entrance surface than the land with which it is pair
20、ed to form a track. 4.22 logical track: Either 25 consecutive sectors for disks with 512-byte sectors or 17 consecutive sectors for disks with 2 04%byte sectors in one or more physical tracks. The first sector of each logical track is assigned sector number 0. 4.23 logical ZCAV: A disk format requir
21、ing Zoned Constant Angular Velocity operation and with tracks n in the Data Zone all being logical tracks. 4.24 mark: A feature of the recording layer which may take the form of a magnetic domain, a pit, or any other type or form that can be sensed by the optical system. The pattern of marks represe
22、nts the data on the disk. Note 1 - Subdivisions of a sector which arc named mark are not marks in the sense of this definition. 4.25 optical disk: A disk that will accept and retain information in the form of marks in a recording layer, that can be read with an optical beam. 4.26 optical disk cartri
23、dge (ODC): A device consisting of a case containing an optical disk. 4.27 partially embossed disk: An optical disk which contains both rewritable and embossed data fields in the Data Zone. 4.28 physical track: The path which is followed by the focus of the optical beam during one revolution of the d
24、isk. 4.29 physical track group: A fixed number of consecutive physical tracks in the Data Zone. 4.30 pitch: The distance between adjacent physical track centrelines, measured in a radial direction 4.31 polarization: The direction of polarization of an optical beam is the direction of the electric ve
25、ctor of the beam. Note 2 The plane of polarization is the plane containing the electric vector and the direction of propagation of the beam. The polarization is right-handed when to an observer looking in the direction of propagation of the beam, the end-point of the electric vector would appear to
26、describe an ellipse in the clockwise sense. 4.32 read power: The optical power, incident at the entrance surface of the disk, used when reading. Note 3 - It is specified as a maximum power that may be used without damage to the written data. Lower power may be used provided that the signal-to-noise
27、ratio and other requirements of this International Standard are met. 4.33 recording layer: A layer of the disk on, or in, which data is written during manufacture and/or use. 4.34 Reed-Solomon code: An error detection and/or correction code which is particularly suited to the correction of errors wh
28、ich occur in bursts or are strongly correlated. 4.35 sector: The smallest addressable part of a track in the Information Zone of a disk that can be accessed independently of other addressable parts of the zone. 4.36 space: The area between marks along the track. 3 ISO/IEC 15041:1997 (E) OISO/IEC 4.3
29、7 spindle: The part of the disk drive which contacts the disk and/or hub. 4.38 substrate: A transparent layer of the disk, provided for mechanical support of the recording layer, through which the optical beam accesses the recording layer. 4.39 zone: An annular area of the disk. 5 Conventions and no
30、tations 5.1 Representation of numbers - A measured value is rounded off to the least significant digit of the corresponding specified value. It implies that a specified value of 1,26 with a positive tolerance of +O,Ol, and a negative tolerance of -0,02 allows a range of measured values from 1,235 to
31、 1,275. - Letters and digits in parentheses represent numbers in hexadecimal notation. - The setting of a bit is denoted by ZERO or ONE. - Numbers in binary notation and bit combinations are represented by strings of digits 0 and 1. - Numbers in binary notation and bit combinations are shown with th
32、e most significant bit to the left. - Negative values of numbers in binary notation are given in TWOs complement. - In each field the data is recorded so that the most significant byte (byte 0) is recorded frrst. Within each byte the least significant bit is numbered 0 and is recorded last, the most
33、 significant bit (numbered 7 in an g-bit byte) is recorded first. This order of recording applies also to the data input of the Error Detection and Correction circuits and to their output. - Unless otherwise stated, all track numbers refer to logical tracks. - Unless otherwise stated, a group of dec
34、imal digits of the form xxx/yyy indicates that the value xxx applies to 512-byte sectors and that the value yyy applies to 2 04%byte sectors. 5.2 Names The names of entities, e.g. specific tracks, fields, etc., are given with a capital initial. 6 List of acronyms AM CRC DDS DMA DOW ECC FAl FA2 ID LS
35、B MO MSB ODC O-ROM PA PDL P-DOW P-ROM RLL(l,7) Address Mark Cyclic Redundancy Check Disk Definition Structure Defect Management Area Direct Overwrite Error Correction Code Functional Area 1 Functional Area 2 Identifier Least Significant Byte Magneto-Optical Most Significant Byte Optical Disk Cartrid
36、ge Optical Read Only Memory Postamble Primary Defect List Partial ROM Direct Overwrite Partial Read Only Memory Run Length Limited (code) Rewritable 4 OISO/IEC ISO/IEC 15041:1997 (E) SDL SM TIA VFO ZCAV Secondary Defect List Sector Mark Time Interval Analyser Variable Frequency Oscillator Zoned Cons
37、tant Angular Velocity 7 General description of the optical disk cartridge The optical disk cartridge which is the subject of this International Standard consists of a case containing an optical disk. The case is a protective enclosure for the disk. It has access windows covered by a shutter. The win
38、dows are automatically uncovered by the drive when the cartridge is inserted into it. The optical disk is recordable on one side. Data can be written onto the disk as marks in the form of magnetic domains in the recording layer and can be erased from it with a focused optical beam, using the thermo-
39、magnetic effect. Data may be directly written over existing data by modulating the intensity of the optical beam. The data can be read with a focused optical beam, using the magneto-optical effect. The beam accesses the recording layer through the transparent substrate of the disk. Part of the disk
40、or the entire disk may contain read-only data in the form of pits embossed by the manufacturer. This data can be read using the diffraction of the optical beam by the embossed pits. 8 General requirements 8.1 Environments 8.1.1 Testing environment The test environment is the environment where the ai
41、r immediately surrounding the optical disk cartridge has the following properties: temperature : 23 “C + 2 “C relative humidity : 45 % to 55 % atmospheric pressure : 60kPato 106kPa air cleanliness : Class 100 000 (see annex K) No condensation on or in the optical disk cartridge shall occur. Before t
42、esting, the optical disk cartridge shall be conditioned in this environment for 48 h minimum. It is recommended that, before testing, the entrance surface of the optical disk shall be cleaned according to the instructions of the manufacturer of the disk. Unless otherwise stated. all tests and measur
43、ements shall be made in this test environment. 8.1.2 Operating environment This International Standard requires that an optical disk cartridge which meets all requirements of this International Standard in the specified test environment provides data interchange over the specified ranges of environm
44、ental parameters in the operating environment. The operating environment is the environment where the air immediately surrounding the optical disk cartridge has the following properties: temperature relative humidity absolute humidity atmospheric pressure temperature gradient relative humidity gradi
45、ent air cleanliness magnetic field strength at the recording layer for any condition under which a beam is in focus 5 “C to 55 “C 3 % to 85 % 1 g/m3 to 30 g/m3 60 kPa to 106 kPa 10 “C/h max. 10 %/h max. Office environment (see also T. 1) 32 000 A/m max. (see also T.2) ISO/IEC 15041:1997 (E) OISO/IEC
46、 magnetic field strength at the recording layer during any other condition : 48 000 A/m max. No condensation on or in the optical disk cartridge shall occur. If an optical disk cartridge has been exposed to conditions outside those specified in this clause, it shall be acclimatized in an allowed ope
47、rating environment for at least 2 h before use. (See also annex R) 8.1.3 Storage environment The optical disk cartridge without any protective enclosure shall not be stored in an environment outside the range allowed for storage. The storage environment is defined as an environment where the air imm
48、ediately surrounding the optical disk cartridge has the following properties: temperature relative humidity absolute humidity atmospheric pressure temperature gradient relative humidity gradient air cleanliness magnetic field strength at the recording layer : -10 “C to 55 “C : 3 % to 90 % : 1 g/m3 t
49、o 30 g/m3 : 60kPato 106kPa : 15 “CArmax. : 10 %/l-i max. : Office environment (see also T.l) : 48 000 A/m max. No condensation on or in the optical disk cartridge shall occur. 8.1.4 Transportation This International Standard does not specify requirements for transportation; guidance is given in annex S. 8.2 Temperature shock The optical disk cartridge shall withstand a temperature shock of up to 20 “C when inserted into, or removed from, the drive. 8.3 Safety requirements The cartridge shall satisfy the safety requirements of IEC 950, when used in the intended manner or in any foreseeable u
