Unix deficiencies/problems

[Jeff Hardy]

Actually there is no restriction in UNIX that a filesystem reside on one
disk. By convention it has been done this way. The interface between UNIX 
and its devices is through the [cb]devsw arrays. One could quite easily
write a pseudo-driver that had a single entry and actually used several
disks to implement it. You do NOT want to put any disk addresses in the
file system. There are however restrictions imposed on the sizes of the
filesystems or number of inodes due to the sizes of the variables that hold
this information.
		Jeff Hardy