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Command Processing
126 C141-C013
(2) Alternate area
The alternate area in user space (spare sectors within each cell and alternate cells)
are excluded from the abovementioned logical data block addresses. Access to
allocated sectors as alternate blocks within the alternate area is performed
automatically by the HDD's defect management (sector slip processing and
alternate block processing), so it is not particularly necessary for the user to
access the alternate area. Also, data blocks in the alternate area cannot be clearly
specified and accessed directly.