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Universal Disk Format
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storage, standard (UDF) A CD-ROM file system standard
that is required for DVD ROMs. UDF is the OSTA's
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.