Editing ISO 9660 (section)

=== Other extensions ===

For operating systems which do not support any extensions, a name translation file <code>TRANS.TBL</code> must be used. The <code>TRANS.TBL</code> file is a plain [[ASCII]] text file. Each line contains three fields, separated by an arbitrary amount of [[Whitespace character|whitespace]]:

* The file type ("F" for file or "D" for directory);
* The ISO 9660 filename (including the usually hidden ";1" for files); and
* The extended filename, which may contain spaces.
Most implementations that create TRANS.TBL files put a single space between the file type and ISO 9660 name and some arbitrary number of tabs between the ISO 9660 filename and the extended filename.

Native support for using <code>TRANS.TBL</code> still exists in many ISO 9660 implementations, particularly those related to [[Unix]].  However, it has long since been superseded by other extensions, and modern utilities that create ISO 9660 images either cannot create TRANS.TBL files at all, or no longer create them unless explicitly requested by the user.  Since a TRANS.TBL file has no special identification other than its name, it can also be created separately and included in the directory before filesystem creation.

The [[ISO 13490]] standard is an extension to the ISO 9660 format that adds support for multiple [[Session (CD)|sessions]] on a disc. Since ISO 9660 is by design a read-only, pre-mastered file system, all the data has to be written in one go or "session" to the medium. Once written, there is no provision for altering the stored content. ISO 13490 was created to allow adding more files to a writeable disc such as [[CD-R]] in multiple sessions.

The ISO 13346/ECMA-167 standard was designed in conjunction to the ISO 13490 standard. This new format addresses most of the shortcomings of ISO 9660, and a subset of it evolved into the [[Universal Disk Format]] (UDF), which was adopted for [[DVD]]s. The volume descriptor table retains the ISO9660 layout, but the identifier has been updated.<ref>{{cite web| url = http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-167.pdf| title = ECMA-167 - Volume and File Structure for Write-Once and Rewritable Media using Non-Sequential Recording for Information Interchange}}</ref><ref>{{cite web| url = http://www.standards.com/StandardsDownloads/birth.html| title = Birth Announcement: ISO/IEC 13346 and ISO/IEC 13490}}</ref>