Personal Computer Service Manual
M
Z
3500
5. MFD
INTERFACE
5-1.
Outline
Floppy
disk
is a
disk
which
is
made
of a
mylar
sheet
whose
surface
is
coated
with
magnetic
particles
and set on the
device
to
write
and
read
data
on the
surface
of the
disk
It
will
be
necessary
to
know operating
pnciple
of the
floppy
disk
unit
and
operational description, including
recording method
and
format.
5-2.
Floppy
disk
As
various recording methods
and
formats
are
used
for
floppy
disk (F.D.)
systems
we
will
discuss
some
of
them
3)
Components
of
FD's:
Head
engage
slit
(do
not
touch)
1)
Floppy disk nomenclature
Floppy
disks
called
by
different
names
dependng
on the
manufacturer
[>-
Floppy media
(or
simply
as
medn)
<•'
Diskette
Floppy disk
2)
Types
of
media
Four
types
are
used
at
present
depending
on
their
storage
capacity
(>-
Single
sided, double density
(floppy
disk-1)
[°
Double-sided,
double
density
(floppy
disk-2D)
Single
sided
media
index
detect
hole
Double
sided
media
index
detect
hole
Front
side-
Head
1
Feverse
side
Head-0
4)
Write protect notch
Different
write
protects
are
adopted depending
on the
drive
unit
used.
Example-1:
In the
case
of the
CE331
the
presence
of
light
reflection
is
sensed
by the
photo
coupler
and
decoded
as
write protect
Write protected
Front
side
o
0
-
No
reflection
(Write
enable)
Write enabled
Front
side
o
0
-
(Reflect"n<!
r«ywing)