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FDD412A/B
(7)
Electromagnetic
door
lock/umlock
mechanism
pene
Fig.
1.1
Outside
View of FDD-412A/B
Floppy
Disk
Drive
2.
PRINCIPLES
OF OPERATION
2.1
Outline
The
FDD
(floppy
disk
drive)
is
a device
that
writes
and
reads
data
to
and
from
the
floppy
disk.
As
shown
in
Fig.
2.1,
a
floppy
disk
has
77
concentric
"tracks"
on
either
surface
(i-e.,
154
tracks
on both
sides).
Data
is
sequentially
recorded
on
each
track.
A carriage
has.one
magnetic
head
on
each
side
respec-
tively,
and
read/write
data.
It moves
radially,
processing
data
on
the
tracks.
To write
or
read
data
to
or
from
a given
location
on
the
floppy
disk,
the
following
steps
are
required:
(1)
The
magnetic
head
and
recording
medium
are
given
a relative
velocity.
(2)
The magnetic
head
is positioned
over
the
target
track.
(3)
The
target
data
is
searched
from
among
numerious
data
records
written
on
that
track.
:
(4)
The
data
is
read
from
or
written
onto
the
record.
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