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UDF (Universal Disk Format) - file system invented by Optical Storage Technology Association. UDF - new file system for CD with support of DVD and CD-RW. Standart CD-ROM usually use <a href='iso9660.html'>ISO 9660</a>. A lot of operating system can read ISO 9660 CD-R disks, but ISO 9660 has some limitations, which make it incompatible with DVD, CD-RW and other new formats of disks. UDF allow to write files on CD-R and CD-RW disks without losses of disk space using method of batch writing. UDF - the best file system for DVD, as have the best support of disk with large size.</body>