U
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.
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