ODC standardization since 1984 - Definitions and acronyms

Standardization of Optical Disk Cartridges since 1984

Definitions and Acronyms

1 Definitions

The following definitions are used:

CD-ROM: A 120 mm one-sided optical disk, entirely pre-recorded, in an irreversible way, with data. The recording method and the format are the same as those of the audio CD.
R/W: The data can be written, read and erased many times over the whole recording surface(s).
WORM: The data, once written, can be read many times; data can be appended on the remaining part of the recording surface. The data is recorded in an irreversible way.
WO: The data, once written, can be read many times; data can be appended on the remaining part of the recording surface. This functionality is obtained by software.
ROM: An optical disk part, entirely pre-recorded, in an irreversible way, with data. The data can be read many times.
P-ROM: An R/W disk which is partially ROM.
O-ROM: An optical disk which is entirely ROM.
MO (for "magneto-optical"): A recording technology using thermo-magnetic and magneto-optical effects. In P-ROM and O-ROM disks the magneto-optical effect is not used for reading the pre-recorded embossed data.
PC (for "phase change"): A recording technology using the phase change effect. In P-ROM and O-ROM disks the phase change effect is not used for reading the pre-recorded embossed data.
Capacity: The capacity is expressed in user bytes. Two capacities can be stated, e.g., if two sector lengths are available.

2 Acronyms

Acronyms used are: