Universal Disk Format

Universal Disk Format (UDF) is an optical-disc filesystem specification maintained by the Optical Storage Technology Association. It supports recording and exchanging data on media including DVDs and Blu-ray discs.

ISO 9660: ISO 9660 is a filesystem standard for data on optical discs, designed for broad compatibility. UDF can coexist with this older format to make a disc readable by legacy systems.
DVD-Video: DVD-Video is a format for distributing films and other video content on DVD discs. UDF forms part of the filesystem structure used on DVD-Video discs.
Optical disc: An optical disc stores information in a format read or written using laser light. UDF organizes files on this physical class of storage media.
High Sierra Format: High Sierra Format is an early optical-disc filesystem specification that influenced ISO 9660. It belongs to the lineage of optical-disc filesystem standards preceding UDF.
Packet writing: Packet writing records data on optical media in small units rather than writing an entire disc at once. UDF supports incremental recording workflows used by rewritable optical discs.
Blu-ray Disc: Blu-ray Disc is an optical disc format for high-definition video and data storage. Blu-ray specifications use UDF to organize files on recorded discs.
Optical Storage Technology Association: The Optical Storage Technology Association is an industry organization that develops standards for optical storage. It maintains the Universal Disk Format specification.
Mount Rainier: Mount Rainier is a specification for packet-written optical discs with operating-system-managed defect handling. It adds drive-level features to rewritable discs rather than defining a replacement filesystem for UDF.
Optical disc authoring: Optical disc authoring is the process of preparing and recording data or media content onto optical discs. Authoring software creates disc layouts and filesystems that UDF-aware drives can read.
DVD-RAM: DVD-RAM is a rewritable DVD format designed for repeated recording and direct access to stored data. Its random-access recording suits UDF-based file storage.

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