Fujitsu M2361A Customer Engineering Manual page 90

Index
AM
3
Index
To
More than one defect on a track causes the track to be flagged as a
defective track. The first four media defects on the track are logged.
Figure 4.4.3 shows the format when there are no defects in the first 105
bytes after the index mark.
HAl
14 29303I 3233 3435 36 3940 4344
4748 51 52 55
SYNC ,Yl
HO
~!I
FO
All"O",
19 19) ..
1st Defect
2nd Defect 3rd Defect 4th Defect I.
ALL"O"s
Pos
jLe;'lh
Pos.
I
Len,lh
Pos.
l
Lcn.lh Pos·1lcn.lh
30 2 2
I I 2 2 2
'
,
2 2 I 3
L
H' h Order bit
--
-- ---
- -
---
-
--
18
defective track
=
"~:
_
Index
7879
SYNC
IQI9I,.
ALL"O"s
20
2
85
HA2
88 89 9293 96 97 100
CYl
HD '.;.'
•
L-
1st Defect
Pos
Ile~'lh
2 I I
2
rd r b'
High 0
e
It
defective track
=
"I ..
2nd Defect 3rd Defect
POI. Ilcn.lh
2 2
Pas Ilcn.lh
2 2
Figure 4.4.3 Format 1
4th Defect
Pos.
I
Len.lh
2 2
104
j
FO) All"O"s
1
I
3
t
If the beginning of a defect is located in the region of bytes 10 - 55, 60
bytes of zeros are added to Gap 1. Figure 4.4.4 shows an example of this
format.
__ ---------------------------HAI' ____________________ __
14 SS
69 89 90 92 94 9S 96 99 100 103 104 107108 111112113 liS
SYNC eYl
t
1.19, ••
o
r --=:....:::....:~------------------- HA2'
116- 118119 138139 141 143 145 148149
IS21S3
IS6 1S7 160161 164
Index
r
It
AM
)
.,
~YNC
eYL ND ALL
1919),.
'0'
ht Defect 2nd Defecl 3rd Defect 4th Defect
FO
ALL"O"s
ALL"O"s
20 2 1 I 1
Po.
!len.,h
2 1
Po.
!lelllfh
1 1
Po •.
Ileftl' h
Pos
IUftl1h
1 1
1 1 I
)
t<
or
Figure 4.4.4 Format 2
If a defect is located in the region of bytes 56 - 104, the gap before the
address mark is increased to 60 bytes. Figure 4.4.5 shows an example of
this format.
B03P-4825-0002A •••
Ol
4 - 19