ISO9660A CD File System standard.
It was the first real world-wide adopted CD file system and it was derived from the earlier High Sierra standard.
Files and folders (directories) are still in the DOS 8.3 notation.
The file and folder names are recorded in SBCS or MBCS.
Maximum directory hierarchy depth can not exceed 8 Levels.
This File System is mandatory available on all CDs.
It is used by DOS, Win3.11, Mac, Sun, Win95 or higher if no Joliet or UDF available.