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Byte
Size
Field Name
Description
1:0
Word
Format Version
Data table format version (=0002h)
3:2
Word
Sampling Period
Absolute HDA Temperature sampling period in minutes.
0000h indicates sampling is disabled.
5:4
Word
Interval
Timer interval between entries in the history queue.
6
Byte
Max Op Limit
Maximum recommended continuous operating temperature. This is a
one byte 2’s complement number that allows a range from -127°C to
+127°C to be specified. 80h is an invalid value. This is a fixed value.
7
Byte
Over Limit
Maximum temperature limit. This is a one byte 2’s complement
number that allows a range from -127°C to +127°C to be specified.
80h is an invalid value. This is a fixed value.
8
Byte
Min Op Limit
Minimum recommended continuous operating limit. This is a one byte
2’s complement number that allows a range from -127°C to +127°C to
be specified. 80h is an invalid value. This is a fixed value.
9
Byte
Under Limit
Minimum temperature limit. This is a one byte 2’s complement
number that allows a range from -127°C to +127°C to be specified.
80h is an invalid value. This is a fixed value.
29:10
Byte[20]
Reserved
31:30
Word
Queue Size
Number of entry locations in history queue.
This value is 128.
33:32
Word
Queue Index
Last updated entry in queue. Queue Index is zero-based, so Queue
Index 0000h is the first location in the buffer (at offset 34). The most
recent temperature entered in the buffer is at Queue Index + 34.
See Note 1 and Note 2.
Table 71 Data Format of HDA Absolute Temperature History Table -1
106
Western Digital Ultrastar DC HC310 SATA Product Manual