Pseudo file system types are logical groupings of files that reside in disk-based systems. The TFS pseudo file system is not included in the SunOS release 5.7 software.
The SunOS release 5.7 pseudo file systems are:
CACHEFS pseudo file system - can be used to improve performance of slow devices such as a CD-ROM drive.
PROCFS pseudo file system - resides in memory and contains a list of active processes, by process number, in the /proc directory. See the proc(4) man page.
FDFS pseudo file system - provides explicit names for opening files using file descriptors.
FIFOFS pseudo file system - contains pipe files that give processes common access to data.
NAMEFS pseudo file system - used mostly by STREAMS for dynamic mounts of file descriptors on top of files.
SWAPFS pseudo file system - the default swap device when the system boots, or you create additional swap space.