Standard ECMA-201
Data Interchange on 90 mm Optical Disk
Cartridges - Capacity: 230 Megabytes per Cartridge
2nd edition (December 1994)
This Ecma Standard specifies the characteristics of 90 mm Optical Disk
Cartridges (ODC) with a capacity of 230 Mbytes per Cartridge. The Standard
specifies three related, but different implementations of such cartridges,
viz.
Type R/W
Provides for data to be written, read and erased many times over the
whole recording surface of the disk using the thermo-magnetic and magneto-optical
effects.
Type P-ROM
Provides for a part of the disk surface to be embossed by stamping
or other means. This part of the disk is read without recourse to the magneto-optical effect. All parts which are not embossed provide for data to meet the requirements
of Type R/W.
Type O-ROM
Provides for the whole of the disk surface to be embossed and reproduced by stamping or other means. This type of disk is read without recourse to the magneto-optical effect.
Type R/W, Type P-ROM and Type O-ROM are also referred to as "fully rewritable", "partially embossed" and "fully embossed", respectively.
This Ecma Standard specifies
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the conditions for conformance testing and the Reference Drive;
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the environments in which the cartridges are to be operated and stored;
-
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, both embossed and user-written; including the physical disposition of the tracks and sectors, the error correction codes, 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 read data from the disk.
This Ecma 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.
The following files can be freely downloaded:
File name |
Size (Bytes) |
Content |
ECMA-201.pdf |
8 633 001 |
Acrobat (r) PDF file |
This Ecma publication is also approved as ISO/IEC 13963.
The previous replaced "historical" edition of this Ecma Standard is available here.
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