Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
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18.7.1
Log Page parameters
Each log page begins with a 4-byte page header followed by zero or more variable-length log parameters.
Page header
Page Code field identifies which log page is being transferred.
The Page Length field specifies the length in bytes of the following log parameters.
Log parameters
Each log parameter begins with a 4-byte parameter header followed by one or more bytes of parameter
value data.
The Parameter Code field identifies which log parameter is being transferred for that log page.
The Parameter Control field, the 3rd byte of each parameter header, contains several fields.
- DU The Disable Update bit is set to 0 to indicate that the drive updates the log parameter value to reflect
events that should be noted by that parameter.
- TSD The Target Save Disable bit is set to zero to indicate that the drive provides a Target defined method for
saving log parameters.
- ETC The enable Threshold Comparison bit is set to 0 to indicate the drive does not perform comparisons
between cumulative and any threshold values.
- TMC The Threshold Met Criteria field is not valid because this drive does not perform threshold comparisons.
This field is set to 0.
- Format and Linking The F & L field indicates the type of log parameter and how parameters that reach their
maximum value are handled.
- 00b: Data counter: If any other parameter in this log page reaches its maximum value, then this parameter
shall stop incrementing until reinitialized by a Log Select command.
- 01b: List format ASCII data: No maximum values to handle
- 10b: Data counter: If another parameter reported in this log page reaches its maximum value, then this
parameter shall not stop incrementing. This parameter may be reinitialized by a Log Select command.
- 11b: List format binary data: No maximum values to handle.