Universal Disk Format
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).
| Developer(s) | ISO/IEC, Ecma International, OSTA |
|---|---|
| Full name | Universal Disk Format |
| Introduced | 1995 |
| Partition IDs | Not assigned but suggested: 0x07 (MBR) EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (GPT) |
| Limits | |
| Max volume size | 2 TiB (with 512-byte sectors), 8 TiB (with 2 KiB sectors, like most optical discs), 16 TiB (with 4 KiB sectors) |
| Max file size | 16 EiB |
| Max filename length | 255 bytes (path 1023 bytes) |
| Allowed filename characters | Any 16-bit Unicode Code point excluding U+FEFF and U+FFFE |
| Features | |
| Dates recorded | creation, archive, modification (mtime), attribute modification (ctime), access (atime) |
| Date range |
|
| Date resolution | Microsecond |
| Forks | Yes |
| Attributes | Various |
| File system permissions | POSIX |
| Transparent compression | No |
| Other | |
| Supported operating systems | Various |
In engineering terms, Universal Disk Format is a profile of the specification known as ISO/IEC 13346 and ECMA-167.
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