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The disk/directory system provided the user machine. (The ECS system
was merely intended as a tool for the production of the disk/directory
system.) Further levels above the disk/directory system were thought
of more in terms of executives than artificial machines.
Objects that existed in the disk/directory system were called disk
objects, of which the two major ones were files and directories. The
files provided a place to store data much as in the ECS system and the
directories provided a naming structure for the disk objects. Also,
the directories stored disk level capabilities, corresponding to the
function provided by C-lists in the ECS system. A number of other disk
objects existed and will be described subsequently.