ECMA - European Association for Standardizing Information and Communication Systems
Scope
This Ecma Standard specifies the mechanical@ physical and optical characteristics of a 120 mm and an 80 mm dual layer DVD Recordable disk to enable the interchange of such disks. It specifies the quality of the prerecorded@ unrecorded and the recorded signals@ the format of the data@ the format of the information zone@ the format of the unrecorded zone@ and the recording method@ thereby allowing for information interchange by means of such disks. This disk is identified as a DVD Recordable disk for Dual Layer (DVD-R for DL). This Ecma Standard specifies: ? 120 mm and 80 mm nominal diameter disks that may be either single or double sided@ ? the conditions for conformance@ ? the environments in which the disk is to be operated and stored@ ? the mechanical and physical characteristics of the disk@ so as to provide mechanical interchange between data processing systems@ ? the format of the pre-recorded information on an unrecorded disk@ including the physical disposition of the tracks and sectors@ the error correcting codes and the coding method used@ ? the format of the data and the recorded information on the disk@ including the physical disposition of the tracks and sectors@ the error correcting codes and the coding method used@ ? the characteristics of the signals from pre-recorded and unrecorded areas on the disk@ enabling data processing systems to read the pre-recorded information and to write to the disks@ ? the characteristics of the signals recorded on the disk@ enabling data processing systems to read the data from the disk. This Ecma Standard provides for interchange of disks between disk drives. Together with a standard for volume and file structure@ it provides for full data interchange between data processing systems.