Table 72 Data Format Of Hda Absolute Temperature History Table -2 - Western Digital Ultrastar DC HC310 Specifications

Note 1 – The Absolute HDA Temperature History is preserved across power cycles with the requirement that
when the drive powers up, a new entry is made in the history queue of 80h, an invalid absolute temperature value.
This way an application viewing the history can see the discontinuity in temperature result from the drive being
turned off.
Note 2 – When the Absolute HDA Temperature history is cleared, for new drives or after changing the Logging
Interval, the Queue Index shall be set to zero and the first queue location shall be set to the current Absolute HDA
Temperature value. All remaining queue locations are set to 80h.

Table 72 Data Format of HDA Absolute Temperature History Table -2

92
Western Digital Hard Disk Drive OEM Specification