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3-2 C141-E205
Alternate Cylinder
Note: 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.)
Cylinder – 143
to
Cylinder – 4
User space
(Primary
Cylinder
0 - (n - 1))
System space
Internal test space
Cylinder – 154
to
Cylinder – 147
•
SA0
SA139
Internal test cylinder
~ ~
~ ~
~ ~
~ ~
User Space for Cell 0-0
Spare Sectors per Cell 0-0
User Space for Cell 1-0
Spare Sectors per Cell 1-0
User Space for Cell P1-0
Spare Sectors per Cell P1-0
User Space for Cell xx-1
User Space for Cell yy-17
.
.
Zone Cell Cylinder
0
1
0
26
27
.
.
28
1
53 0
.
m - 26
P1
.
m
(1)
1
17
n
Figure 3.1 Cylinder configuration
Apart from the above logical configuration, the IDD intends to increase the storage capacity by
dividing all cylinders into several zones and changing a recording density of each zone.