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What is the difference between ISO9660 and UDF file system

Posted on 2003-11-03
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What is the difference between ISO9660 and UDF file system? Can not be realize the increamental function with IOS9660 like UDF filesystem ?  
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Question by:BreezeSun
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by:chicagoan
ID: 9676067
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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by:chicagoan
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by:BreezeSun
ID: 9698776
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 ?  
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chicagoan earned 50 total points
ID: 9700976
As I mentioned, packet writers finalize CD's with ISO9660 LEVEL 3
This is not the same as the original ISO9660 specification and needs specific drivers to read.

Basic differences:
Level 1: Filename cannot be longer than 8 chars, Filename extention cannot be longer than 3 chars
Level 2: Filename can be up to 255 chars long
Level 3: Same as level 2 but files can be written in multiple extents (-> Packet writing).

CDFS isn't a file FORMAT it's the redirector that lets your operating system read CD's, and if it wants to call ISO9660 Level3 UDF, it isn't wrong, it's a matter of terminology.

bottom line: You cannot create an ISO9660 Level 1 CD using packet writing.
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