Cylinder Allocation; Performance Characteristics - Hitachi HDS725050KLA360 Specifications

4.3.2 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 loca-
tion.

4.4 Performance characteristics

Drive performance is characterized by the following parameters:
• Command overhead
• Mechanical head positioning
- Seek time
Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive specification
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