1、INTERNATIONAL STANDARD ISOAEC 15498 First edition 1997-12-15 Information technology - Data interchange on 90 mm optical disk cartridges - HS-1 format - Capacity: 650 Mbytes per cartridge Technologies de /information - ichange de don - the environments in which the cartridges are to be operated and s
2、tored; - the 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, called HS-1 (HS stands for “Hyper-Storage”), including the physical disposition of the tracks and sector
3、s, the error correction codes, and the recording 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 da
4、ta processing systems to 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. 2 Conformance 2.1 Optical disk cartridge
5、(ODC) A claim of conformance with this International Standard shall specify its Type. An ODC 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 which Type(s) is (ar
6、e) supported. A system generating an ODC for interchange shall be in conformance with this International Standard if the ODC meets the mandatory requirements of this International Standard for the Type(s) specified. 2.3 Receiving system A claim of conformance with this International Standard shall s
7、pecify 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 for the Type(s) specified. 2.4 Compatibility statement A claim of conformanc
8、e by a Generating or Receiving system with this International Standard shall include a statement listing any other International Standards supported. This statement shall specify the number of the standard(s), the ODC type(s) supported (where appropriate) and whether support includes reading only or
9、 both reading and writing. I ISO/IEC 15498: 1997 (E) OISO/IEC 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 s
10、ubject 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 standard listed below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 950: 199 1, Saf
11、ety of information technology equipment. 4 Definitions For the purposes of this International Standard, the following definitions apply. 4.1 band: A part of the Data Zone comprising a fixed number of consecutive physical tracks. 4.2 case: The housing for an optical disk, that protects the disk and f
12、acilitates 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. 4.4 clamping zone: The annular part of the disk within which the clamping force is applied by the clamping device. 4.5 control zone: A zone contain
13、ing the information on media parameters and format necessary for writing and reading the remaining tracks of the optical disk. 4.6 Cyclic Redundancy Check (CRC): A method for detecting errors in data. 4.7 data clock: A clock for data detection and data recording, generated by a PLL synchronized to s
14、ervo marks. 4.8 defect management: A method for handling the defective areas on the disk. 4.9 disk reference plane: A plane defined by 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 embosse
15、d mark: A mark so formed as to be unalterable by magneto-optical means. 4.11 entrance surface: The surface of the disk onto which the 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
16、of a segment. NOTE - Subdivisions of a sector which are named field are not fields in the sense of this definition. 4.14 format: The arrangement of information on the disk. 4.15 frame: The smallest addressable part of a track in the Information Zone of a disk that can be accessed independently of ot
17、her parts of the zone. 4.16 flyable zone: A part of the protective coating area over which the slider with a magnetic head can fly. 4.17 groove: See 4.24. 4.18 Gray code Encoded Part (GEP): Tracks containing a portion of control information for a drive which can be detected without tracking servo. 4
18、.19 hub: The central feature on the disk which interacts with the spindle of the disk drive to provide radial centring. 4.20 interleaving: The process of al!ocating the physical sequence of units of data so as to render the data more immune to burst errors. 4.21 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 effect. 2
