Filesystem
From Hackepedia
A filesystem is a subsystem of a UNIX system. It is built on top of secondary storage devices but not limited to that and can also be built on top of primary storage devices (RAM) or be an entirely virtual filesystem. A UNIX system cannot operate without bootstrapping itself and programs from the filesystem.
To view files in a filesystem the command ls is used.
List of filesystems available in UNIX and UNIX-like Operating Systems
Unix File System (ufs)
Most UNIX'es have the ufs filesystem it is derived from the Berkeley ffs filesystem.
Berkeley Fast File System (FFS)
The ffs filesystem was written at UCB by Marshall Kirk McKusick for 4.2BSD. It is still widely used in the BSD family of Operating Systems.
Memory File System (mfs)
The mfs filesystem resides in RAM but is available as a file system. When the system powers off any files left in the mfs filesystem will vanish.
