Editing Optical disc authoring (section)

==File systems==
Optical disc file system types include [[ISO 9660]] (often known simply as "ISO") and [[Universal Disk Format]] (UDF). ISO is most common for CDs and UDF is most common for DVDs and BDs.

===ISO 9660===
{{main|ISO 9660}}
ISO 9660 is a format mainly used on CDs. The ISO 9660 can be extended with [[El Torito (CD-ROM standard)|El Torito]], [[Joliet (file system)|Joliet]], [[Rock Ridge]], or the [[Apple ISO 9660 Extensions]].

El Torito makes it possible to boot from a CD. The Joliet extension by Microsoft makes it possible to have [[Long filename|long file names]] encoded in [[UCS-2]], among other things. Rock Ridge is a system providing [[Filesystem permissions|file-ownership]], fewer restrictions on the file names, and more. Amiga extensions allow use of Amiga-specific attribute bits and comments. The Apple Extensions enables Macintosh-specific creator codes, file type, and so on.

===Universal Disk Format===
{{main|Universal Disk Format}}
Universal Disk Format (UDF) is a newer filesystem that comes with additional features such as Unicode support, packet writing (UDF 1.50), and defect management on rewritable formats. Packet writing can alternatively be implemented with UDF 1.02 and [[Mount Rainier (packet writing)|Mount Rainier]] extensions. It allows one to use the disc like a [[floppy disk]], that is to easily delete, create, and modify files, without having to write the whole disc again.

DVD-Video uses UDF 1.02, however Blu-Ray Disc uses UDF 2.50.

===HighMAT===
A compatibility technology called [[HighMAT]] allows visual material on the disc to be recognised, interpreted and supported by electronic play devices more efficiently.<ref name="Geek-HMAT">{{Cite web |url=https://www.geek.com/news/highmat-a-new-cd-format-550539/ |title=HighMAT: a new CD format |website=Geek.com |publication-date=21 October 2002 |access-date=21 October 2018 |archive-date=21 October 2018 |archive-url=https://web.archive.org/web/20181021234025/https://www.geek.com/news/highmat-a-new-cd-format-550539/ |url-status=dead }}</ref>