Standard ECMA-240
Data Interchange on 120 mm Optical Disk
Cartridges using Phase Change PD Format - Capacity: 650 Mbytes
per Cartridge
(June 1996)
This Ecma Standard specifies the characteristics of 120 mm Optical
Disk Cartridges (ODCs) with a capacity of 650 Mbytes using Phase
Change PD format. The present Ecma Standard specifies two related,
but different implementations of such cartridges, viz.
Type R/W
Provides for data to be written, read and overwritten many times
over the whole recording surface of the disk using the phase change
recording and read-out method.
Type WORM
Provides for data to be written once and read many times over
the whole recording surface of the disk using the phase change
recording and read-out method.
Type R/W and Type WORM are also referred to as "rewritable"
and "write-once" respectively.
This Ecma 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 and physical characteristics of the cartridge,
so as to provide mechanical interchangeability between data
processing systems;
- the format of the information on the disk known as the PD
format; 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 phase change recording characteristics of the disk, enabling
data 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 file can be freely downloaded:
| File name |
Size (Bytes) |
Content |
| ECMA-240.pdf |
1 681 900 |
Acrobat (r) PDF file |
This Ecma publication is also approved as ISO/IEC 15485.
Back
Standards
