(UDF) A CD-ROM file system standard that is required for DVD ROMs. UDF is a replacement for the ISO 9660 file system used on CD-ROMs, but will be mostly used on DVD. DVD multimedia disks use UDF to contain MPEG audio and video streams.

To read DVDs you need a DVD drive, the kernel driver for the drive, MPEG video support, and a UDF driver. DVDs containing both UDF filesystems and ISO 9660 filesystems can be read without UDF support.

UDF can also be used by CD-R and CD-RW recorders in packet writing mode.