IsoBuster - Joliet Joliet

A CD File System standard.
An extension to ISO9660.  It is constructed in the same way but with some changes.

Files and folders (directories) can have long file names.
The file and folder names are recorded in Unicode.
Maximum directory hierarchy depth may exceed 8 Levels.

This File System is extremely popular and 99% of all CDs and DVDs contain it.
(Except Packet written CDs).  It is used by Win95, Win98 and higher if no UDF available.