ISO IEC 11560-1992 Information technology information interchange on 130 mm optical disk cartridges using the magneto-optical effect for write once read multipl.pdf

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1、INTERNATIONAL STANDARD ISO/IEC 11560 First edition 1992-12-15 Information technology - Information interchange on 130 mm optical disk cartridges using the magneto-optical effect, for write once, read multiple functionality Technologies de /information - . - the environment in which the characteristi

2、cs are to be tested; - the environments in which the cartridge are to be operated and stored; - the mechanical, physical and dimensional characteristics of the case and of the optical disk; - the magneto-optical characteristics and the recording characteristics for initializing the disk once, for re

3、cording the information once, for reading it many times, so as to provide physical interchangeability between data processing systems; - the format for the physical disposition of the tracks and sectors, the error correction codes, the modulation method used for recording and the quality of the reco

4、rded signals. 2 Conformance A 130 mm optical disk cartridge is in conformance with this International Standard if it meets all the mandatory requirements specified herein. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions o

5、f this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standards listed

6、below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 683-13: 1986, Heat treatable steels, alloy steels and free-cutting steels - Wrought stainless steels ISO/IEC 9171-1:1990, Information technology - 130 mm optical disk cartridge, write once, for informati

7、on interchange - Part 1: Unrecorded optical disk cartridge IEC 950: 1986, Safety of information technology equipment including electrical business equipment 4 Definitions For the purposes of this International Standard, the following definitions apply. 4.1 case : The housing for an optical disk, tha

8、t protects the disk and facilitates disk interchange. 4.2 clamping zone : The annular part of the disk within which the clamping force is applied by the clamping device. 4.3 control track : A track containing the information on media parameters and format necessary for writing, reading and erasing t

9、he remaining tracks on the optical disk. 4.4 cyclic redundancy check (CRC) : A method for detecting errors in data. 4.5 defect management : A method for handling the defective areas on the disk. 4.6 disk reference plane : A plane defined by the perfectly flat annular surface of an ideal spindle onto

10、 which the clamping zone of the disk is clamped, and which is normal to the axis of rotation. 4.7 entrance surface : The surface of the disk on to which the optical beam first impinges. 4.8 error correction code (ECC) : An error-detecting code designed to correct certain kinds of errors in data. ISO

11、/IEC 11560:1992 (E) 4.9 format : The arrangement or layout of the data on the disk. 4.10 hub : The central feature on the disk which interacts with the spindle of the disk drive to provide radial centring and the clamping force. 4.11 interleaving : The process of allocating the physical sequence of

12、units of data so as to render the data more immune to burst errors. 4.12 Kerr rotation : The rotation of the plane of polarization of an optical beam upon reflection from the recording layer as caused by the magneto-optical Kerr effect. 4.13 land and groove : A trench-like feature of the disk, appli

13、ed 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 paired to form a track. 4.14 mark : A feature of the recording layer which may take the form of a magnetic domain, a pit, or any othe

14、r type or form that can be sensed by the optical system. The pattern of marks represents the data on the disk. Note 1 - Subdivisions of a sector which are named mark are not marks in the sense of this definition. 4.15 optical disk : A disk that will accept and retain information in the form of marks

15、 in a recording layer, that can be read with an optical beam. 4.16 optical disk cartridge (ODC) : A device consisting of a case containing an optical disk. 4.17 polarization : The direction of polarization of an optical beam is the direction of the electric vector of the beam. Note 2 - The plane of

16、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 describe an ellipse in the clockwise se

17、nse. 4.18 pre-recorded mark : A mark so formed as to be unalterable by magneto-optical means. 6.19 read power : The read power is 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 wri

18、tten data. Lower power may be used providing that the signal-to-noise ratio and other requirements of this Intemational Standard are met. 4.20 recording layer : A layer of the disk on, or in, which data is written during manufacture and/or use. 4.21 Reed-Solomon code : An error detection and/or corr

19、ection code which is particularly suited to the correction of errors which occur in bursts or are strongly correlated. 4.22 spindle : The part of the disk drive which contacts the disk and/or hub. 4.23 substrate : A transparent layer of the disk, provided for mechanical support of the recording laye

20、r, through which the optical beam accesses the recording layer. 4.24 track : The path which is followed by the focus of the optical beam during one revolution of the disk. 4.25 track pitch : The distance between adjacent track centrelines. measured in a radial direction. 4.26 write-inhibit hole : A

21、hole in the case which, when detected by the drive to be open, inhibits both write and erase operations. 4.27 write once optical disk : An optical disk in which the data in specified areas can be written only once and read many times by an optical beam. 5 Conventions and notations 5.1 4 Representation of numbers In each field the information is recorded so that the most significant byte (byte 0) is recorded first. Within each byte the least significant bit is numbered bit 0, the most significant bit (i.e. bit 7 in an &bit byte) is recorded first. 2