Universal Disk Format

UDF
Developer(s)ISO/IEC, Ecma International, OSTA
Full nameUniversal Disk Format
Introduced1995; 29 years ago (1995)
Partition IDsNot assigned but suggested:[1]
0x07 (MBR)
EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (GPT)
Limits
Max volume size2 TiB (with 512-byte sectors), 8 TiB (with 2 KiB sectors, like most optical discs), 16 TiB (with 4 KiB sectors)[a][2]
Max file size16 EiB
Max filename length255 bytes (path 1023 bytes[b])
Allowed filename
characters
Any 16-bit Unicode Code point excluding U+FEFF and U+FFFE
Features
Dates recordedcreation, archive, modification (mtime), attribute modification (ctime), access (atime)
Date range
24:00:00.000, 1 January 1 (UTC)  – 23:59:59.999, 31 December 9999 (UTC) [3]
Date resolutionMicrosecond
ForksYes
AttributesVarious
File system
permissions
POSIX
Transparent
compression
No
Other
Supported
operating systems
Various

Universal Disk Format (UDF) is an open, vendor-neutral file system for computer data storage for a broad range of media. In practice, it has been most widely used for DVDs and newer optical disc formats, supplanting ISO 9660. Due to its design, it is very well suited to incremental updates on both write-once and re-writable optical media. UDF was developed and maintained by the Optical Storage Technology Association (OSTA).

In engineering terms, Universal Disk Format is a profile of the specifications known as ISO/IEC 13346 and ECMA-167.[4]

  1. ^ "Serverfault answer for: What is the partition id / filesystem type for UDF?".
  2. ^ "Wenguang's Introduction to Universal Disk Format (UDF)". Google Sites. 1 February 2009. Section 5.1 Highlight of the UDF Format. Retrieved 16 July 2014.
  3. ^ ECMA 167 third edition, June 1997
  4. ^ "ECMA-167 – Volume and File Structure for Write-Once and Rewritable Media using Non-Sequential Recording for Information Interchange" (PDF).


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