The ISO 9660 Standard provides a Volume Identifier in byte position 41 to 72 of the Primary Volume Descriptor. A DICOM File-Set is defined to be one volume, and the File-Set ID shall be placed in the Volume Identifier, starting with byte position 41. Extra bytes within the Volume Identifier shall be spaces (20H).
The Volume Identifier for a File-Set ID consisting of zero characters shall consist of all spaces (20H).
Notes: 1. The character set for File IDs and File-set IDs (see PS 3.10) is a subset of the ISO 9660 character set, therefore no further restrictions need to be imposed.
2. Multiple ISO 9660 File-Sets on a single volume are achievable, but this profile does not support multiple file-sets.