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Message: [QUOTE="Gordon Burditt, post: 2491498"] The concept of tree-structured directories didnt get popular until Unix I'm reasonably sure they weren't present in CP/M 2.0, which is why I said CP/M 2.0. The "sub-areas" didn't increase the number of files you could fit on a floppy. "user 0" was special. A "user 0" file appeared in all "sub-areas", and a program running as "user 0" saw only "user 0" files. And perhaps most important, there was no standardized way of specifying "the config.h file in user area 5" by some kind of path name. CP/M didn't provide a way of translating a text "path name" into a FCB, so although it was possible to invent a syntax for such a "path name", every application that wanted to use such a thing had to be aware of the syntax or use a library that was, and it wouldn't work for applications written before that feature was introduced. [/QUOTE]