ECMA-331

This Ecma Standard specifies the characteristics of a case for use with the 120 mm and 80 mm DVD-RAM disks specified in Standard ECMA-330. The present Ecma Standard specifies nine related, but different implementations of this case, viz.

• Type 1 – A case for a one-sided (Type 1S) or a two-sided (Type 2S) 120 mm DVD-RAM disk such that the disk cannot be removed from the case. This case is reversible.
• Type 2 – A case for a one-sided (Type 1S) 120 mm DVD-RAM disk such that the disk may be removed from the case. This case is not reversible.
• Type 3 – A case into which a one-sided (Type 1S) or a two-sided (Type 2S) 120 mm DVD-RAM disk may be inserted, then used as a cartridge. This case is not reversible.
• Type 4 – A case for a two-sided (Type 2S) 120 mm DVD-RAM disk such that the disk may be removed from the case. This case is reversible.
• Type 5 – A case into which a one-sided (Type 1S) or a two-sided (Type 2S) 120 mm DVD-RAM disk may be inserted, then used as a cartridge. This case is reversible.
• Type 6 – A case for a two-sided (Type 2S) 80 mm DVD-RAM disk such that the disk may be removed from the case. This case is reversible.
• Type 7 – A case for a one-sided (Type 1S) 80 mm DVD-RAM disk such that the disk may be removed from the case. This case is not reversible.
• Type 8 – A case into which a two-sided (Type 2S) 80 mm DVD-RAM disk may be inserted, then used as a cartridge. This case is reversible.
• Type 9 – A case into which a one-sided (Type 1S) 80 mm DVD-RAM disk may be inserted, then used as a cartridge. This case is not reversible.

This Ecma Standard specifies

• the environments in which the cases are to be operated and stored;
• the dimensional and mechanical characteristics of the case, so as to provide mechanical interchangeability between data processing systems.

This Ecma Standard provides for mechanical interchange between optical disk drives. Together with Standard ECMA-330 for 120 mm (4,7 Gbytes per side) and 80 mm (1,46 Gbytes per side) DVD-RAM disks and a standard for volume and file structure, it provides for full data interchange between data processing systems.