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Universal Disk Format (UDF) is an implementation of the specification known as ISO/IEC 13346 and ECMA-167 and is an open vendor-neutral file system for computer data storage for a broad range of media. In practice, it has been most widely used for DVDs and newer optical disc formats, supplanting[取代] ISO 9660. Due to its design, it is very well suited for incremental updates on both recordable or (re)writable optical media[适合可读写的光盘]. UDF is developed and maintained by the Optical Storage Technology Association (OSTA组织).
Normally, authoring software will master a UDF file system in a batch process and write it to optical media in a single pass. But when packet writing to rewriteable media, such as CD-RW, UDF allows files to be created, deleted and changed on-disc just as a general-purpose file system would on removable media like floppy disks and flash drives[像磁盘,U盘一样能读、写、删除、修改]. This is also possible on write-once media, such as CD-R, but in that case the space occupied by the deleted files cannot be reclaimed (and instead becomes inaccessible).[但在此文件系统中,被删除文件的空间不能再被回收利用,而是成为不可访问的区域]
Multi-session mastering is also possible in UDF, though some implementations may be unable to read disks with multiple sessions. [UDF采用多区段multi-session控制]
Universal Disk Format builds are as follows:
1)Plain (Random Read/Write Access). This is the original format supported in all UDF revisions
2)Virtual Allocation Table a.k.a. VAT (Incremental Writing). Used specifically for writing to CD-R and (write-once) media
3)Spared (Limited Random Write Access). Used specifically for writing to CD-RW and DVD-RW (rewritable) media
UDF version 1.02 1.50 2.0x 2.50 2.60
Windows XP/Server 2003 yes yes yes no no [Operating system]
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