Directory Layout
All files and directories in a Files-11 filesystem are contained inside one or more parent directories, and eventually under the root directory, the master file directory (see below). The filesystem is therefore organised in a directed acyclic graph (DAG) structure.
In this example (see right), File 2 has a directory entry under both Dir 2 and Dir 3; it is "in" both directories simultaneously. Even if removed from one, it would still exist in the other directory until removed from there also. This is similar to the concept of hard links in UNIX, although care must be taken that the file is not actually deleted on disks that are not set up for hard links (only available on ODS-5 disks, and then only if the disk has hard links enabled).
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