Drive Organization - Western Digital Ultrastar DC HC310 Specifications

4.4

Drive Organization

4.4.1 Drive Format
Upon shipment from WDC manufacturing, the drive satisfies the sector continuity in the physical format by means of
the defect flagging strategy described in Section 5 on page 12 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 WDC manufacturing and includes data sent from a defect location.
Western Digital Hard Disk Drive OEM Specification
8