Specifications
1.-4.2
Read/Write
anel
Control
Electroalea
The standard
~iaoproceS50r
and electronics are packaged
o~
one printed circuit
board
containing the
foUowing
circuits:
a.
Index Generator Circuit
b.
Head Position Actuation Drivers
c.
Read/Write
Amplifiers
d.
Drive
(READY)
up to Speed Circuit
e.
Drive
Select Circuit
f.
Write
Fault Detection Circuit
g.
Read/Write Head Select Circuit
h.
Ramped (Buffered ) Stepper Circuit
I.
Track 00 Indicator
j.
Brushless Spindle Motor Control Circuits
1.4.3
Drive
Mechanlam
I
The
brushless
dc
drive
motor rotates the spindle
at
.3.600
(:t
0, -
72)
revolutions per minute.
1.4.4
Poaltlonlng
Mechanl
••
The
read/write heads are mounted on an arm
which
is
positioned
by
I
Fasflex™
IV
rotary actuator. A stepper
motor
is
used
to
precisely position the rotary actuator utilizing a unique
metal
band/capstan concept. Figure
1-2
u-
lustrates
thiS
positioning
mechanism. .
1.4.5
Read/Write
Head.
and
DI.k(l)
The
recording
media
consists
of
a thin, lubricated, magnetic oxide coating on a 130
mdUmeter
diameter aluminum
substrate.
This
coating formulation, together
with
the
low
load
force/low
mass
Winchester-type
flying
heads, per-
mits
reliable
contact stan/stop operation.
I Data
on
each
disk
surface are read
by
one read/write head, each
of
which
accesses
320
data tracks.
The
drive
is
available
in
two
basic
configurations: one
disk
with
two read/write heads (706)
or
two
disks
with four read/write
heads
(712).
The
heads should be positioned at cybnder 353 via
IOftware
prior to power down
in
order to
minimize
the potential
for
damage to the recorded data on portable systems.
Refer
to paragraph 1.4.8.
1.4.6
AIr flltratioD
Syatem
The
disk(s)
and read/write heads are
fuUy
encased In a protective cover using an integral
recirculating
air
system,
with
a recirculating
filter.
to maintain a contaminant-free environment. A separate absolute breather
filter
allows
pressure equalization within the envelope
to
the ambient
air
without contamination.
See
figure 1-3.
.
'-4
)