In addition to the Primary Volume Descriptor(s), Supplementary Volume Descriptors or Enhanced Volume Descriptors may be present. Supplementary Volume Descriptors describe the same volume as the Primary Volume Descriptor does, and are normally used for providing additional code page support when the standard code tables are insufficient. The standard specifies that ISO 2022 is used for managing code sets that are wider than 8 bytes, and that ISO 2375 escape sequences are used to identify each particular code page used. Consequently, ISO 9660 supports international single-byte and multi-byte character sets, provided they fit into the framework of the referenced standards. However, ISO 9660 does not specify any code pages that are guaranteed to be supported: all use of code tables other than those defined in the standard itself are subject to agreement between the originator and the recipient of the volume.Įnhanced Volume Descriptors were introduced in ISO 9660, Amendment 1.
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