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When first standardized, the UDF file system aimed to replace ISO 9660, allowing support for both read-only and writable media.

The Optical Storage Technology Association standardized the UDF file system to form a common file system for all optical media: both for read-only media and for re-writable optical media. High-Definition Versatile Multilayer Disc (HD VMD).HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM.Blu-ray Disc ( BD): BD-R & BD-RE, Blu-ray 3D, Mini Blu-ray Disc, 4K Blu-ray ( Ultra HD Blu-ray).

DVD: DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-R DS, DVD+R DS, DVD-RW, DVD+RW, DVD-RAM, DVD-D, DVD-A, DVD-Video, HVD, EcoDisc, MiniDVD.Compact disc ( CD): CD-DA, CD-ROM, CD-R, CD-RW, 5.1 Music Disc, Super Audio CD ( SACD), Photo CD, CD Video ( CDV), Video CD ( VCD), Super Video CD ( SVCD), CD+G, CD-Text, CD-ROM XA, CD-i, MIL-CD, Mini CD.Multi-session mastering is also possible in UDF, though some implementations may be unable to read disks with multiple sessions. This is also possible on write-once media, such as CD-R, but in that case the space occupied by the deleted files cannot be reclaimed (and instead becomes inaccessible). But when packet writing to rewritable media, such as CD-RW, UDF allows files to be created, deleted and changed on-disc just as a general-purpose filesystem would on removable media like floppy disks and flash drives. Normally, authoring software will master a UDF file system in a batch process and write it to optical media in a single pass. In engineering terms, Universal Disk Format is a profile of the specification known as ISO/IEC 13346 and ECMA-167. UDF was developed and maintained by the Optical Storage Technology Association (OSTA).

Due to its design, it is very well suited to incremental updates on both write-once and re-writable optical media. In practice, it has been most widely used for DVDs and newer optical disc formats, supplanting ISO 9660. Universal Disk Format ( UDF) is an open, vendor-neutral file system for computer data storage for a broad range of media. Vendor-neutral file system, used in practice for DVDs and other optical discsĮBD0A0A2-B9E5-4433-87C0-68B6B72699C7 ( GPT)Ģ TiB (with 512-byte sectors), 8 TiB (with 2 KiB sectors, like most optical discs), 16 TiB (with 4 KiB sectors) Īny 16-bit Unicode Code point excluding U+FEFF and U+FFFEĬreation, archive, modification (mtime), attribute modification (ctime), access (atime)Ģ4:00:00.000, 1 January 1 (UTC) – 23:59:59.999, 31 December 9999 (UTC)

Download the new for mac USB Drive Letter Manager 5.5.8.1