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Ck)
Example
of
defective
envelope
(1)
(1)
FDD412A/B
Example
of
defective
envelope
(2)
Table
5.2
Cyclic
Once
per
revolution
Several
times
per
revolution
Noncyclic
Changes
at
ramdom
Changes
in
fixed
area
Remedied
by rewriting
(m)
Figs
0020
.
Table
5.3
Symptom
Not
remedied
by rewriting
Changes
in
Checks
on
speed
device
Head
detached
Faulty
writing
Dent,
etc.
With
FM method:
I-5,1-6
. -
TI-4
Checks
on
input
device
I-1,1-2,1-3,II-1
(O0..... )
A>
8 us
COD so a x )
A>
4 us
With
MFM
method:
(1010..... »)
A>
4&uUs
(100100...)
A > 3 Us
CU Nessie
estes )
A>
2 us
Probable
Cause
Error
at writing
II-2,II-3,11~4,
TII-5
Error
at
reading
11-2, 11-3,11I-4,
TTI-5
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