With all iso9660 levels all filenames are restricted to upper case letters, numbers and the underscore (_). The maximum filename length is restricted to 31 characters, the directory nesting level is restricted to 8 and the maximum path length is limited to 255 characters.

The Joliet directory records in addition to regular iso9660 file names. This is primarily useful when the discs are to be used on Windows-NT or Windows-95 machines. The Joliet filenames are specified in Unicode and each path component can be up to 64 Unicode characters long. Joliet uses the UTF-16 coding for Unicode characters.

The '-joliet-long' swith for mkisofs allows Joliet filenames to be up to 103 Unicode characters. This breaks the Joliet specification - but appears to work. Use with caution. The number 103 is derived from: the maximum Directory Record Length (254), minus the length of Directory Record (33), minus CD-ROM XA System Use Extension Information (14), divided by the UTF-16 character size (2).

$ cdrdao disk-info --device 0,0,0
0,0,0: SONY CD-RW  CRX195E1     Rev: ZYS5
Using driver: Generic SCSI-3/MMC (raw writing) - Version 2.0 (options 0x0000)

CD-RW                : no
Total Capacity       : n/a
CD-R medium          : Ritek Co.
                       Short Strategy Type, e.g. Phthalocyanine
Recording Speed      : n/a
CD-R empty           : no
Toc Type             : CD-ROM XA
Sessions             : 1
Last Track           : 2
Appendable           : no

On Disk: 33675 files, 105 folders, 645MB (677,217,436B), Usage: 1,139MB(by GaugeIt) 1,016MB(by Explorer) By EzCreater: 33676 files, 106 folders, 693.3MB On Final CD: ==> 696MB