The name space is hierarchical and supports aliases and indirect files.
Supports dynamic allocation.
Files and directories are stored in the same way. Thus, directories can grow and can store long file names.
Supports access lists.
Supports logical disks. Some of these are in the same physical disk, while others are in different disks.
Device names are included in the naming space.
Supports cylinder groups, blocks and fragments.
Free blocks are indicated by bitmaps.
Supports constant time seek.
File and directory contents are cached.
A file may be accessed by several processes at the same time.
Some of them share the R/W mark, while others have their own copy.