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FDD412A/B
5.3.2
Medium
Life
write
operation.
handle
and
store
it significantly
affects
the
service
life.
Since
the
disk
is mounted
as
needed,
the
way
to
'In addi-
(1)
[| cacesory |
1
a
10
li
12
Associated
with
FDD
control
method
Associated
_with
FDD
installa-
tion
design
Associated
with
how
to
set
medium
on
FDD
Table
5.8
Probable
Cause
Shortening
Service
Life
Damaged
Portion
Remarks
head
load/unload
opera-
tions
on
the
same
spot of
oxide
coating
Continuous
use
in head
load-on
state
Use
at
ambient
tempera-—
ture
of 50°C or more
Medium
inserted
without
FDD
spindle
rotating
Medium
left
inserted
Synchronized
and
repeated | Oxide-coating
disk
surface
do
-
Disk
center
hole
:
Jacket
1
|
This
problem
depends
on
the
FDD
control
circuit
for solution.
(Considered
in circuit
design).
-.do -
| Where
the
FDD
is
used
in
an
inadequately
venti-
lated
location,
any
margin
providing
for
temperature
rises
is
exhausted.
The
disk
center
hole
tends
to be
damaged,
causing
an
off~track
state.
Spindle
revolutions
damage
the
jacket.
halfway
for
a long
time,
with
spindle
rotating
Door
closed,
with
medium
inserted
halfway
into
FDD
Jacket
and
area
around
disk
center
hole
; damages
the
area
around
Pressure on the
collet
i
the
center
hole
Associated
with
how
to handle
medium
Fingerprints
on
oxide-
coated
disk
surface
i
ir
re pc
Oxide-coated
disk
surface
; oxide
coating.
Chemical
ingredients
at
fingerprints
change
the
Use
of solvent
(thinner,
alcohol,
Freon,
etc.)
-.do
-
Chemical
change
on
oxide-coating
Use
of
clips
Writing
on
index
with
pencil,
ball-point
pen
or
any
hard
tip writing
utensil
Jacket
and
disk
Oxide-coating
disk
surface
2 (SP
The
portion
pinched
by
|!a
clip
is
mechanically
; deformed,
error.
causing
an
Use
of
a felt-tip
pen
(or
any
soft
tip
writ-
| ing utensil)
is prefer-
Bend
or
breakage
Use
of
erasure
red.
-
do -
Damages
causes
errors.
~-do
-
Rubber
chips
result
in
—100-
error.
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