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FDD412A/B
(4)
Ze
The
Index
:
Index
VY
V
IDO ! Data 0 | ID1 ! Data 1 | ID2
: Data 2
{
:
EL RCCOEE
Soe
IDn ! Data
n
Fig.
2.2
Data Arrangement
on Track
The
data
is
read
out
or
written
in.
When
the
target
record
is
found,
data
is written
to or
read
from
the
data
part.
The
magnetic
heads
of
the
FDD
are
used
for
both
heading
and
writ-
ing.
When
a write
command
is
given
by
the
FDC,
a current
flows
in
the magnetic
head
and
all
readout
operations
are
suppressed.
That
is,
the
FDD
performs
either
a write
or
readout
operation
at
any
one
time,
not
both
simultaneously.
The
data
read
from
disk
is
of analog
waveshapes,
which
are
digitized
by the
FDD
for
trans-
mission
to
the
FDC.
The
model
A FDD
incorporates
a VFO
circuit,
and
is
capable
of
demodulating
the
data
that
was
modulated
by the
so-called
FM/MFM
magnetic
recording
method.
Configuration
FDD
is
composed
of a drive
mechanism
and
the
control
electronics,
as
shown
in Fig.
2.3
(on page
14).
Zerdee
The
reo)
(2)
(3)
1
Drive
Mechanism
drive
mechanism
consists
of
the
following:
Carriage
The
carriage
is
equipped
with
2 magnetic
heads
for
side
0 and
side
1.
For
movement,
the
carriage
receives
step
motor
revolutions
via
a
steel
belt.
Step
motor
The
step
motor
turns
in response
to
the
STEP-N
signal
from
the
controller.
Step
motor
revolutions
are
transmitted
via
the
steel
belt
to
the
carriage
which
positions
the
magnetic
head
at
a given
location.
Spindle
motor
The
floppy
disk
medium
is press-fit
to
the
spindle
motor
by a
collet
for
rotation.
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