 Kevin Clements |
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Introduction to ISO 9660 ISO 9660 (8+3 characters set) To make an ISO 9660 Level 1-compliant disc, it is strongly suggested that you take ISO 9660's filename limitations into consideration from the start when creating your files and applications. Use this option to record discs with filenames which comply strictly with ISO 9660 Level 1 restrictions.
Any MS-DOS 8+3 filenames (unrestricted character set) Microsoft Windows products allow you to use file and folder names up to 255 characters long, which may include spaces. To maintain DOS compatibility, a DOS-standard (8+3) filename is associated with each file; these names are created automatically by Windows products and can be viewed in Properties for each file. To create these DOS-standard names, long filenames are truncated and the tilde (~) is added; a number may also be added to distinguish between files which would otherwise have identical names when truncated. For example, the filename "Letters to Send.DOC" might become "LETTER~1.DOC." Joliet Joliet is an extension of the ISO 9660 standard, developed by Microsoft for Windows products, to allow CDs to be recorded using long filenames (it also allows for using the Unicode international character set). For files recorded to CD, Joliet allows you to use filenames up to 64 characters in length, including spaces. Versions of Windows NT up to 3.51 build 1057 do NOT read the long filenames on Joliet discs. NT 4.0 does support Joliet. If you select this option, filenames up to 64 characters long will be allowed. If a filename is longer than 64 characters, a message will appear allowing you to edit the filename. RomeoRomeo allows you to write to disc filenames up to 128 characters long, including spaces. This is not part of the Joliet standard, and the Unicode character set is not supported. If read under DOS or Windows 3.1, file and directory names will appear truncated to 8+3. (However, if two or more filenames become identical when truncated, you will probably be able to see only the first.) Romeo long filenames can be read on Windows 95 and NT 3.51 systems. Romeo discs can be read on Macintosh systems if the filenames are not longer than 31 characters. When you select this option, your disc can include filenames up to 128 characters long. File and directory names are automatically converted to uppercase for maximum compatibility with NT 3.51 and DOS. About File Version Numbers In strict interpretations of the ISO 9660 standard, all directory entries of files must contain the file name followed by a semicolon and the file version number, ";1." Most operating systems automatically remove these two characters from the filename when accessing a file or displaying a directory, but versions of the Macintosh operating system prior to 7.5 did not. The result is that when you look at an ISO 9660 disc on a Macintosh with System 7.0 or earlier, all the filenames appear as "FILENAME;1". This could cause problems with an application that must run from CD on the Macintosh: if your application looks for a file named "MYFILE.TXT", it will only find a file named "MYFILE.TXT;1". Note: With later Mac system software, if the option key is held down while the disc is being mounted on the desktop, the System will display file version numbers. Some UNIX systems require a setting to make the version numbers "disappear." Want more information on this subject? Follow these links: |
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