UDF Bridge
A combination of UDF and ISO 9660 file system formats that provides backward-compatibility with ISO 9660 readers while allowing full use of the UDF standard.
UDF (Universal Disc Format)
A standard developed by the Optical Storage Technology Association designed to create a practical and usable subset of the ISO/IEC 13346 recordable, random-access file system and volume structure format.
Unidirectional prediction
A form of compression in which the codec uses information only from frames that have already been decompressed.
universal DVD
A DVD designed to play in DVD-Audio and DVD-Video players (by carrying a Dolby Digital audio track in the DVD-Video zone).
universal DVD player
A DVD player that can play both DVD-Video and DVD-Audio discs.
user data
The data recorded on a disc independent of formatting and error-correction overhead. Each DVD sector contains 2048 bytes of user data.
UXGA
A video graphics resolution of 1600x1200.
