Hitachi HUS154530VLF400 User Manual

                                    

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification

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The notch page contains parameters for direct-access devices that implement a variable number of blocks per cylinder. Each 
section of the logical unit with a different number of blocks per cylinder is referred as a notch. The only field that is change-
able is the Active Notch field. 

• ND = One meaning that this device is a notched drive.

• LPN = Zero meaning that the notches are based upon physical parameters of the drive (cylinder #), not logical parame-

ters.

• Maximum Number of Notches is the number of notches the drive can support. This value is drive model dependent.

• Active Notch indicates to which notch subsequent MODE SELECT/SENSE command parameters pertain. A value of 0 

is used for parameter values which apply to all notches. Values from 1 to the maximum value depending on the model 
specify the notch number, where notch 1 is the outermost notch. Following mode parameters are based on the current 
active notch:

•Mode Page 2

-   Read Buffer Full Ratio
-   Write Buffer Empty Ratio

•Mode Page 3

-   Alternate Sector per Zone

-   Alternate Track per Zone