Editing ISO 9660 (section)

=== Top level ===

{| class="wikitable"
|+ ISO 9660 file system
|-
| System area (32,768 B)
| ''Unused by ISO 9660''
|-
| rowspan=3 | Data area
|-
| Volume descriptor set
|-
| Path tables, directories and files
|}

The ''system area'', the first 32,768 data bytes of the disc (16 sectors of 2,048 bytes each), is unused by ISO 9660 and therefore available for other uses.<ref name="iso9660-simplified">{{cite web| url = https://pierrelib.pagesperso-orange.fr/filesystems/iso9660_simplified.html| title = ISO9660 Simplified for DOS/Windows}}</ref> While it is suggested that they are reserved for use by [[booting|bootable media]],<ref>{{cite web| url = http://www.brankin.com/main/technotes/Notes_ISO9660.htm| title = ISO9660}}</ref> a CD-ROM may contain an alternative file system descriptor in this area, and it is often used by [[hybrid CD]]s to offer [[classic Mac OS]]-specific and [[macOS]]-specific content.{{citation needed|date=November 2020}}