Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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Feature Previous 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.
Sector Count Current Allocation Unit Size In Sectors (7:0)
Sector Count Previous Allocation Unit Size In Sectors (15:8)