Hitachi HDS725050KLA360 Specifications page 127

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The default Command Completion Time Limit (CCTL).
The value is calculated as follows:
(Default CCTL) = ((content of the Features register)*
(Identify Device words (99:98))) micriseconds.
This time shall be used by the device when a streaming
command with the same stream ID and a CCTL of zero is
issued. The time is measured from the write of the command
register to the final INTRQ for command completion.
Allocation Unit Size In Sectors (7:0)
Allocation Unit Size In Sectors (15:8)
Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
113