Apple ISO9660 Extensions

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Optical disc authoring
Optical media types
Standards

Apple Macintosh computers use the HFS (or HFS+) file system on hard disks, mainly.

The HFS file system has more properties than FAT file systems (which are primarily used on Windows 95 and 98 operating systems) do, for example:

  • date of last backup
  • file type
  • creator code
  • flags and data for display
  • reference to a Resource fork

When Apple saw the need to store Macintosh files on CD-ROMs in a way that was still readable by non-Macintosh systems, they chose to use the ISO 9660 format and extended it.

The way the extended information gets stored on an ISO 9660 volume allows a non-aware operating system to still be able to read most of the Macintosh file data.

The result is that the above listed information is simply not visible to the non-aware system, but it would not be able to use that information, anyway, most of the time.

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