The number of spare sectors per cell is fixed at 300. This number cannot be changed by users.
Track 0
Track 1
Cell
Last track
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SPR1 
SPR299 SPR300
Spare sectors (300 sectors)
Note: This HDD manages alternate spare areas for each cell, which is a set of cylinders. One cell consists of 32 to 40 cylinders.
Figure 3.2 Spare area in cell
The alternate cylinder is used for replacement action via the REASSIGN BLOCKS command or automatic replacement processing. The alternate cylinder is allocated to 10 cylinders at the end of the last zone in the user space.
The user space and the system space share the alternate cylinders.
Note: The number of alternate cylinders cannot be changed.
Figure 3.3 Alternate cylinder
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