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DISK PACK
The disk pack is the recording medium for
the drive.
The disk pack consists of 12
l4-inch dis'·s, center-mounted on a hub.
The
recording surface of each disk is coated
with a layer of maqnetic iron oxide and re-
lated binders and adhesives.
The top and
bottom disks are protective non-recording
disks.
There are 19 recording surfaces and one
track servo surface.
The servo disk con-
tains pre-recorded information that is used
by the servo logic to position the heads to
the desired track.
The recording tracks are grouped in a 2 inch
band near
the
outer edge of the disk.
The
83318200
A
disk has 823 tracks.
The diameter of the
outer track (823) is approximately 13 inches,
while track 0 is about 3 inches.
The tracks
are spaced about 0.0026 inches apart.
The disk pack has a two-piece container. The
bottom cover can be removed
s~ply
by grasp-
ing and rotating the center hub.
The top
cover is designed so that it can be removed
only by installing the disk pack on the
spindle.
The disk pack can be
~emoved
from
the spindle only by using the top cover (see
Operation section).
This design protects
the disk pack from physical damage and greatly
reduces the possibility of contamination of
the disk pack recording surfaces.
3-19
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