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4.4 Drive organization
4.4.1 Drive Format
Upon shipment from Hitachi Global Storage Technologies manufacturing the drive satisfies the sector continuity in
the physical format by means of the defect flagging strategy described in Section 5 on page 24 in order to provide
the maximum performance to users.
4.4.2 Cylinder allocation
Physical cylinder is calculated from the starting data track of 0. It is not relevant to logical CHS. Depending on the
capacity some of the inner zone cylinders are not allocated.
Data cylinder
This cylinder contains the user data which can be sent and retrieved via read/write commands and a spare area for
reassigned data.
Spare cylinder
The spare cylinder is used by Hitachi Global Storage Technologies manufacturing and includes data sent from a
defect location.
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