ISO 9660 Level 1 compliant directory names

I am confused about the exact limitations on folder names in an ISO 9660 (Level 1) compliant filesystem. I read through the wiki开发者_JAVA百科pedia page and it says:

File names are limited to eight characters with a three-character extension, using upper case letters, numbers and underscore only. - wikipedia

When it says 'File Names' does it really mean file or folder names? if not then what are the restrictions on folder names?

Thanks!

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You can get the original ISO 9660 standard and its 1987 revision from Ecma International. The precise text is

10.1 Level 1

At Level 1 the following restrictions shall apply:

• Each file shall consist of only one File Section;
• a File Name shall not contain more than 8 [characters];
• a File Name Extension shall not contain more than 3 [characters];
• a Directory Identifier shall not contain more than 8 [characters].

(I've elided the distinction between "d-characters" and "d1-characters" which is irrelevant here.)

So the answer to your question is, at level 1, file names are restricted to 8+3 characters a la DOS, but directory ("folder") names are restricted to eight characters with no extension (unlike DOS, if I remember correctly).

Note that the standard has always included Level 2, which allows 31-character filenames (but still, if I'm reading it right, with only one dot); Level 1 is only for interop with pre-VFAT DOS, and shouldn't be necessary in a CDROM mastered today. (The restrictions on the size and depth of a CDROM directory hierarchy are, unfortunately, still relevant.)