Ecma International is an industry association founded in 1961 and dedicated to the standardization of Information and Communication Technology (ICT) and Consumer Electronics (CE). The 94th General Assembly held in Nice, December 13, 2007, approved, among the others, the following documents:

Standard ECMA-364 - 3rd edition (December 2007)

• Data interchange on 120 mm and 80 mm Optical Disk using +R DL Format - Capacity: 8,55 and 2,66 Gbytes per Side (Recording speed up to 16X)

This Ecma Standard specifies the mechanical, physical and optical characteristics of 120 mm recordable optical disks with capacities of 8,55 Gbytes and 17,1 Gbytes. It specifies the quality of the recorded and unrecorded signals, the format of the data and the recording method, thereby allowing for information interchange by means of such disks. The data can be written once and read many times using a non-reversible method. These disks are identified as +R DL.

This Ecma Standard also specifies 80 mm disks with capacities of 2,66 Gbytes and 5,32 Gbytes. These disks shall have the same characteristics as the 120 mm disks, except for some parameters related to the smaller dimensions. All parameters unique for the 80 mm disks are specified in Annex A.


Standard ECMA-380 - (December 2007)

• Data Interchange on 130 mm Rewritable and Write Once Read Many Ultra Density Optical (UDO) Disk Cartridges – Capacity: 60 Gbytes per Cartridge – Second Generation

This Ecma Standard specifies the mechanical, physical, and optical characteristics of a 130 mm optical disk cartridge (ODC) that employs thermo-optical Phase Change effects to enable data interchange between such disks.

This Ecma Standard specifies two types, viz.:

• Type RW (Rewritable) provides for data to be written read and erased many times over the recording surfaces of the disk.
• Type WORM (Write Once Read Many) provides for data once written to be read a multiplicity of times. This type shall use a Write Once Read Many times recording material (written marks cannot be erased and attempted modifications of the written marks are detectable). Multisession (incremental write operations) recording may be performed on Type WORM disks.

The disk shall be two-sided with a nominal capacity of 30,0 Gbytes per side and the cartridge (two sides) shall provide a nominal capacity of 60,0 Gbytes.

The complete documents are available for download: ECMA-364 and ECMA-380.