ISO-9660 Naming Properties

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File Names Each file name consists of three components:

Name Extension Version Number

These components are formatted as follows:


Keep in mind the following:

A name or extension can consist of zero or more alphanumeric characters and underscores (_). The version number can range from 1 to 32767. The name and extension together must consist of at least one character, for example .000;1 is a valid ISO-9660 file name. Levels of Interchange ISO-9660 defines three levels of interchange.

Level 1 restricts the number of characters in the name to eight and the number of the characters in the extension to three.

Levels 2 and 3 restrict the total length of the name and extension to 30 characters, excluding the dot and semicolon. Order of Files in a Directory/Folder Files are sorted in alphabetical order. If two file names do not have the same number of characters, the shorter name is treated as if it is extended with extra spaces. This rule applies to both the name and the extension.

If two files have identical names, the file with the higher version number is sorted first, for example, AA.;2 is sorted before AA.;1.

Directory/Folder Names Keep in mind the following points:

A directory name can consist of up to 31 uppercase, alphanumeric characters and underscores (_).

With the root level being level one, the maximum nesting level of directories is eight.

The total number of characters that specify a file within a directory or path must be fewer than 256.

Directory names are sorted alphabetically. Sorting Order The sorting order of characters is defined by ISO-646.

0 through 9 are sorted first A through Z are sorted next Underscores are sorted last.

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