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 recordable 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)
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