Joliet Recording Specification

The Joliet specification resolves the following ISO 9660 ambiguities for UCS-2 volumes:

• Use a SVD with a UCS-2 (UNICODE) Escape Sequence.
• The UCS-2 escape sequences used are: (25)(2F)(40), (25)(2F)(43), or (25)(2F)(45).
• The default setting of bit 0 of the SVD "Volume Flags Field" is ZERO.
• The Unicode Wide characters shall be recorded in "Big Endian" (Motorola) format.
• Special Directory Identifiers are recorded as single byte names containing (00) or (01).
• SEPARATOR 1 and SEPARATOR 2 are encoded using an equivalent 16-bit code point.
• Sort ordering is unchanged, except that all justification pad bytes are to be set to (00).

The Joliet specification recommends that several ISO 9660 restrictions be lifted on UCS-2 volumes. The Joliet specification allows for the following interchange rules:

• The File or Directory Identifiers may be up to 128 bytes (64 unicode characters) in length.
• Directory Identifiers may contain file name extensions.
• The Directory Hierarchy may be recorded deeper than 8 levels.
• The volume recognition sequence supports multisession. This is compatible with the CD-Bridge specification.

The Joliet specification may be extended through the use of the following specifications:

• Mode 2 Form 2 extents and CD-DA extents, ("System Description CD-ROM XA")
• System Use Sharing Protocol (not explicitly specified here)
• RockRidge Interchange Protocol (not explicitly specified here)
• Other future CD-ROM file system formats