A namespace is a characteristic of the directory table on a traditional NetWare volume. It stores the names of file entries on the volume. Most popular variations are DOS (the default), LONG (formerly known as OS/2), NFS, and Macintosh Multiple namespaces can exist on the same volume, and there are rules for translating names across them. Also, namespaces contain additional information that some filesystems would have, like Macintosh resource forks or NFS permissions.

On an NSS volume, the directory structure is different, and all namespaces are loaded and enabled by default.