Figure 3.2 Spare Area In Cell; Figure 3.3 Alternate Cylinder - Fujitsu MBA3073NC Product Manual

The number of spare sectors per cell is fixed at 300. This number cannot be changed by users.
Track 0 Sector 0
Track 1
Cell
Last track
Note: This HDD manages alternate spare areas for each cell, which is a set of cylinders. One
cell consists of 32 to 40 cylinders.
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.
34
1
n n+1
Figure 3.2
Figure 3.3
n-m-1 n-m
2n-m-1 2n-m
SPR1
Spare sectors (300 sectors)
Spare area in cell
Alternate cylinder
n-2 n-1
2n-2 2n-1
SPR299 SPR300
C141-E270