P.2.2 ISO 9660 File system

The reader shall be able to read a logical format conforming to ISO 9660 Level 1, 2 and 3, with or without Rockridge or Joliet Extensions, which may or may not be present.

The creator shall be able to create a logical format conforming to ISO 9660 Level 1, 2 or 3, and may or may not add Rockridge or Joliet Extensions.

Note: Though the files within the DICOM Fileset are restricted to names that conform to a subset of ISO 9660 Level 1, other files on the media may have longer filenames. Unlike the Annex of this part specifying CD-R media, strict Level 1 conformance of the filesystem is not required, since this has proven difficult to constrain in practice.

P.2.2.1 Extended Attributes, Permissions and File Characteristics

File modification data, file owner identification, and permissions are part of the ISO 9660 - Extended Attribute Record. Support of the Extended Attribute Record is not required.

If Extended Attribute Records are present, all files within the DICOM File Set shall have permissions such that all users may read all files, and all users may access all directories on all systems.

Note: The intent of these requirements is that for DICOM interchange media, implementation specific access control is not used or required.