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ISO9660
Joliet
A 1995 specification by Microsoft designed to address ISO9660:1988's shortcomings and restrictions regarding:
- Character set
- File name length (raised to 128 bytes from 30)
- Directory tree depth (eliminated 8-level hierarchy restriction, retains 240 total byte limit)
- Directory name format (raised to 128 bytes from 30, and adds file name extensions)
- Character sets ((almost) complete UCS-2 character set, using big-endian encoding)
Joliet implies use of ISO/IEC 10646 (UCS-2) in file naming, and can be detected by examining an ISO9660 SVD (Supplementary Volume Descriptor, ISO9660 section 8.5.6)'s "Escape Sequences" field for the UCS-2 escape sequences 25 2f 40, 25 2f 43, or 25 2f 45.
The following UCS-2 sequences are not allowed in a Joliet file name:
- All code points between 00 00 and 00 1f (control sequences)
- 00 2a (asterisk)
- 00 2f (forward slash)
- 00 3a (colon)
- 00 3b (semicolon)
- 00 3f (question mark)
- 00 5c (backslash)
