Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

What is the difference between ISO9660 and UDF file system

Posted on 2003-11-03
4
Medium Priority
?
2,886 Views
Last Modified: 2008-03-03
What is the difference between ISO9660 and UDF file system? Can not be realize the increamental function with IOS9660 like UDF filesystem ?  
0
Comment
Question by:BreezeSun
  • 3
4 Comments
 
LVL 18

Expert Comment

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/

0
 
LVL 18

Expert Comment

by:chicagoan
ID: 9694145
Did this answer your question?
0
 

Author Comment

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 ?  
0
 
LVL 18

Accepted Solution

by:
chicagoan earned 150 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.
0

Featured Post

Receive 1:1 tech help

Solve your biggest tech problems alongside global tech experts with 1:1 help.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The article will include the best Data Recovery Tools along with their Features, Capabilities, and their Download Links. Hope you’ll enjoy it and will choose the one as required by you.
Is your phone running out of space to hold pictures?  This article will show you quick tips on how to solve this problem.
This tutorial will walk an individual through the process of installing the necessary services and then configuring a Windows Server 2012 system as an iSCSI target. To install the necessary roles, go to Server Manager, and select Add Roles and Featu…
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…
Suggested Courses
Course of the Month14 days, 12 hours left to enroll

577 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question