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
1Scope
This International Standard specifies the characteristics of a 300 mm optical disk cartridge (ODC) of Type WORM(WriteOnce Read Many) using irreversible effects,with a capacity of 30 Gbytes. This WORM ODC’s uses writing effects that areinherently irreversible. Wrtten 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 abilitybetween data processing systems;
the format of the information on the disk, both pre-witten and user-witten, including the physical disposition of the tracksand 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 filestructure it provides for full data interchange between data processing systems.
2Conformance
2.1optical Disk Cartridge (oDc)
An Optical Disk Cartridge shall be in conformance with this International Standard if it meets the mandatory requirementsspecified herein.
2.2Generating System
A generating system shall be in conformance with this International Standard if the ODC it generates is in accordance with 2.1.2.3Receiving System
A receiving system shall be in conformance with this International Standard if it is able to handle an ODC according to 2.1.2.4Compatibility statement
A claim of conformance by a generating or receiving system with this International Standard shall include a statement listingany other ECMA or International Optical Disk Cartridge standard(s) supported by the system for which conformance isclaimed.This statement shall specify the number of the standard(s), including, where appropriate, the ODC Type(s), or theTypes of side, and whether support includes reading only or both reading and writing.
3Normative references
The following normative documents contain provisions which,through reference in this text, constitutc provisions of thisInternational Standard.For dated references,subsequent amendments to, or revisions of, any of these publications do notapply. However,parties to agreements based on this International Standard are encouraged to investigate the possibility ofapplying the most recent editions of the normative documents indicated below.For undated references, the latest edition of thenormative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.ISO/EC 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
4Terms and definitions
For the purpose of this International Standard, the following terms and definitions apply.
4.1case: The housing for an optical disk, that protects the disk and facilitates disk interchange.
4.Clamping Reference Area: The area of the Clamping Zone used to define the Disk Reference Plane.
4.3Clamping Zone:The area of the disk within which the clamping force is applied by the clamping device.4.4Cyclic Redundancy Check (CRC): A method for detecting errors in data.
4.5Data Zone: An annular area within the user zone on the disk having a constant data clock frequency.4.6defect 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 jdeal spindle onto which the
Clamping Reference Area of the disk is clamped, and which is normal to the axis of rotation.
4.8entrance 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.4.10format: The arrangement or layout of information on the disk.
4.11hub: The central feature on the disk which interacts with the spindle of the disk drive to provide radial centring and
the clamping force.
4.12interleaving:The process of allocating the physical sequence of units of data so as to render the data more immune
to burst errors.
4.13 Logical Sector: The minimum addressable user data block.4.14 Logical Block Address: The address of a block of data.
4.15 mark: A feature of the recording layer, which may take the form of a pit, or any other type or form that can be sensed
by the optical system. The pattern of marks represents the data on the disk.
4.16mark edge: The transition between a region with a mark and one without a mark or vice versa, along the track.4.17 mark edge recording: A recording method that uses a mark edge to represent a Channel bit.
4.18optical 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.
4.19optical disk cartridge (ODC): A device consisting of a case containing an optical disk.
4.20polarization: The direction of polarization of an optical beam is the direction of the electric vector of the beam.4.21prerecorded mark: A mark written on the recording layer during manufacturing of the disk.
4.22read power: The read power is the optical power, incident at the entrance surface of the disk, used when reading.4.23 recording layer: A layer of the disk on, or in, which data is written during manufacture and/or use.
4.24 Reed-Solomon code: An error detection andor correction code that is particularly suited to the correction of errors
that occur in bursts or are strongly correlated.
4.25 space: The area between marks along the track.
4.26spindle: The part of the disk drive which contacts the disk and/or hub.
4.27 substrate: A transparent layer of the disk, provided for mechanical support of the recording layer, through which the
optical beam accesses the recording layer.
4.28 track: The path which is followed by the focus of the optical beam during one revolution of the disk.4.29 track pitch:The distance between the centrelines of adjacent tracks, measured in a radial direction.
4.30write-inhibit hole: A hole in the case which, when detected by the drive to be open, inhibits write operation.5Conventions and notations
5.1Representation 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 +0,01, and a negative tolerance of -0,02 allows a range of measuredvalues from 1,235 to 1,275.
– Letters and digits in parentheses represent numbers in hexadecimal notation.
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
