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3-2 C141-E219
N
ote: Spare sectors on the last track in each cylinder are not necessarily placed at the end of the track
because of a track skew or a cylinder skew. (Details are explained in Subsection 3.1.3.)
-Z
-4
Physics Cylinder
Cylinder0
m-1
Cylinder0
Cylinder0
m-1
1
m-1
m-1
m-1
1
(b-1)
1
Trac
k
Spare sectors for each cell
Spare sectors for each cell
Alternate Cell
Head0
Head1
Head
(a-1)
Change
for cell
(b)
(C)
Last Cylinder
(b-1)
Zone0
Zone1
Zone
(X-1)
System space
Spare Cylinder
User space
Figure 3.1 Cylinder configuration
Apart from the above logical configuration, the HDD intends to increase the storage capacity by
dividing all cylinders into several zones and changing a recording density of each zone.