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Drive Organization
Drive Format
Upon shipment from Western Digital manufacturing, the drive satisfies the sector continuity in the physical format by
means of the defect flagging strategy described in Section 5 on page 26 in order to provide the maximum
performance to users.
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 Western Digital manufacturing and includes data sent from a defect location.
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Western Digital Ultrastar DC HC310 SATA Product Manual