What is the difference between ISO9660 and UDF file system

Specifiations for Universal Disk FOrmat  can be found at http://www.osta.org/specs/index.htm
Phil Erdelsky has a good description of ISO9660 at http://www.alumni.caltech.edu/~pje/iso9660.html

UDF discs written by programs like DirectCD, DLA and InCD aren't usable in a CD-ROM reader unless the UDF driver is present on the system or until they're "finalized". Finalized discs are in ISO-9660 format, but it's ISO-9660 Level 3, which not all operating systems can interpret (Win9x and up can, with appropriate "redirectors" installed).

REAL ISO9660 CD's are based on one track, like audio CD's (from which all this originally came) and cannot be written to incrementally.

For more see http://www.cdrfaq.org/

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I was read some information from the web-address of you provided already. but i have a other consider: i have used UDF format with "finalized" in win2K OS, the OS feedback that is a UDF file system,and that isn't CDFS(ISO-9660 format). i think that maybe lie on difference recorder-software, and  UDF format at "finalized" can be change the format to ISO-9660. did that notion can you accept ?