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Deskstar 7K400 Hard Disk Drive specification
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4.4.2 Cylinder allocation
Physical cylinder is calculated from the starting data track of 0. It is not relevant to logical CHS. Depending on the capacity
some of the inner zone cylinders are not allocated.
Data cylinder
This cylinder contains the user data which can be sent and retrieved via read/write commands and a spare area for reassigned
data.
Spare cylinder
The spare cylinder is used by Hitachi Global Storage Technologies manufacturing and includes data sent from a defect loca-
tion.
Table 4: Cylinder allocation
Data Zone
Physical Cylinders
Blk/Trk
0
2,783
1170
1
4,500
1134
2
4,800
1080
3
4,900
1080
4
4800
1012
5
4900
1012
6
4900
990
7
4300
945
8
4200
918
9
3900
900
10
3900
877
11
3100
877
12
3300
855
13
2700
855
14
3200
810
15
2600
810
16
3000
742
17
2200
742
18
2000
742
19
2600
742
20
1600
720
21
2300
675
22
1400
648
23
1800
648
24
1400
648
25
1700
630
26
1700
607
27
1200
607
28
1200
594
29
1400
567
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