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FDD412A/B
Group
Typical
Failure
Table
5.7 (2)
Probable
Cause
Error
Symptom
Remedy
(1)
Disk
+
Brown
impurities
are
present
on
the
oxide-
coated
surface
(oxide
coating
damaged).
[|
©
O
:
The
same
periphery
as
the
index
hole
has
a
spot
that
allows
light
to pass.
Drop-in
is
detected
in
an
index
pulse
observa-
tion.
expired.
The
service
life
Storage
or
operat-
ing temperature/
humidity
require-
ments
were
exceeded,
with
the
result
that
the
oxide
coating
was
peeled
off
and
stuck.
Impurities
that
en-
tered
between
disk
and
jacket
caused
the
oxide
coating
to be
peeled
off
and
stuck.
The
product
quality
is
defective;
the
oxide
coating
is
irregular.
The
product
quality
is
defective;
the
oxide
coating
was
peeled
off.
Impurities
entered
between
disk
and
jacket
and
caused
the
oxide
coating
- to
be
peeled
off
and
stuck.
There
are
burrs
at
the
center
hole
edge.
zg
Center
hole
©
Burr
Read/write
error
L
E
1.
2.
Same
as
remedy
I-l.
Observe
the
storage
and/or
operating
temperature/
humidity
require-
ments.
The
device
does
not
enter
the
ready
state.
Read
errors
or
write
errors
become
more
frequent.
Consult
the
floppy
disk
manufacturer.
Replace
or
discard
"the
disk.
.
While
the
FDD
was
not
powered,
the
floppy
disk
was
inserted
and
the
disk
cover
closed.
In
a rare
case,
this
error
is
attributable
to
an
FDD
failure.
—t+—
The
disk
cover
is
difficult
to open.
Read
error
or
write
error.
Operate
with
care.
Check
the
FDD
collet.
Discard
the
disk.
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