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MZ3500
o MFM
method (double density)
The
MFM
method writes data
on the
basis
of the
condi
tion
metntioned
below,
and it
yields
a
data density
two
Input
data
Write
data
times
the
data density
of the MFM
mode (The
unneceb
sary
clock
pulse
is
eliminated using this method
)
(Condition) Clock
is
written
only
when there
is no
data
0 £ 0 £ 0 1 0
•'•>
n
\ /\ /\
X"V
/\ /
n n nnn n
C C (C) I) (C) '(_
0111
n
n n
'
VnVn
n nV
[ci
|D (ci |u ici ,i> ci
<
i i
0
1 0^0
n
nnn
7
n
/
(0 ;i> (c) (O
i
t
\
Data
that follows Data that
precedes
The
clock pulse
(Ci
will
be
eliminated
in
above illustra
tion
as
there
is no
data preceding
or
following
the
clock
Because
the
data rate
is
2/Js
for
this
method,
it is
possible
to
obtain
twice
the
density
of the FM
method
NOTE
Three
types
of
write data cycl»-
(2f
~>t"> SA*S)
are
used
The
read/write
waveform
is
identical
to FM
method
6)
Media
recording
format
Media
is
formatted
according
to the IBM
format
For
Double
side media, data
is
written
on the
front
side
(head-1)
and the
reverse
side (head-00)
Floppy
disk
Tracks, consists
of 40
tracks,
00-39.
(May also
be
called
cylinders)
Sector.
01-16
Recording density:
256
bytes/sector