• Universal Disk Format (UDF) is a file system defined by the Optical Storage Technology Association (OSTA). OSTA was created to promote the use of recordable optical technologies and products. UDF was developed as a standard to allow file interchange between different operating systems. This makes it ideal for storing files on portable CD-ROM and DVD media.
• UDF, a successor to the CD-ROM file system (CDFS), is an evolving specification. Windows 7 can format discs using version 1.50, 2.00, 2.01, or 2.50. Windows 7 can also use-but not format-discs using the latest version, which is 2.60. Which to choose? It depends on whether you want the CDs or DVDs that you generate to be readable on systems running earlier versions of Windows or Windows Server 2003.

Read more about UDF at: http://www.osta.org/specs/index.htm.