ISO IEC 20162 pdf download.Information technology — Data interchange on 300 mm optical disk cartridges of type WORM (Write Once Read Many) using irreversible effects — Capacity: 30 Gbytes per cartridge
This International Standard specifies the characteristics of a 300 mm optical disk cartridge (ODC) of Type WORM (Write Once Read Many) using irreversible effects, with a capacity of 30 Gbytes. This WORM ODC’s uses writing effects that are inherently irreversible. Written marks cannot be erased and attempted modifications of the written marks are detectable. This International Standard specifies − the conditions for conformance testing and the Reference Drive; − the environments in which the cartridges are to be operated and stored; − the mechanical, physical and dimensional characteristics of the cartridge, so as to provide mechanical interchange ability between data processing systems; − the format of the information on the disk, both pre-written and user-written, including the physical disposition of the tracks and sectors, the error correction codes, the modulation methods used; − the characteristics of the prerecorded information on the disk; − the recording 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 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.
2.1 Optical Disk Cartridge (ODC) An Optical Disk Cartridge shall be in conformance with this International Standard if it meets the mandatory requirements specified herein. 2.2 Generating System A generating system shall be in conformance with this International Standard if the ODC it generates is in accordance with 2.1. 2.3 Receiving System A receiving system shall be in conformance with this International Standard if it is able to handle an ODC according to 2.1. 2.4 Compatibility statement A claim of conformance by a generating or receiving system with this International Standard shall include a statement listing any other ECMA or International Optical Disk Cartridge standard(s) supported by the system for which conformance is claimed. This statement shall specify the number of the standard(s), including, where appropriate, the ODC Type(s), or the Types of side, and whether support includes reading only or both reading and writing.
3 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO/IEC 646:1991 Information technology — ISO 7-bit coded character set for information interchange IEC 60950-1:2001 Information technology equipment — Safety — Part 1: General requirements
4 Terms and definitions
For the purpose of this International Standard, the following terms and definitions apply. 4.1 case: The housing for an optical disk, that protects the disk and facilitates disk interchange. 4.2 Clamping Reference Area: The area of the Clamping Zone used to define the Disk Reference Plane.4.3 Clamping Zone: The area of the disk within which the clamping force is applied by the clamping device. 4.4 Cyclic Redundancy Check (CRC ): A method for detecting errors in data. 4.5 Data Zone: An annular area within the user zone on the disk having a constant data clock frequency. 4.6 defect management: A method for handling defective areas on the disk. 4.7 Disk Reference Plane: A plane defined by the perfectly flat annular surface of an ideal spindle onto which the Clamping Reference Area of the disk is clamped, and which is normal to the axis of rotation. 4.8 entrance surface: The surface of the disk on to which the optical beam first impinges. 4.9 Error Correction Code (ECC): An error-detecting code designed to correct certain kinds of errors in data. 4.10 format: The arrangement or layout of information on the disk. 4.11 hub: The central feature on the disk which interacts with the spindle of the disk drive to provide radial centring and the clamping force.