Table 71 Data Format Of Hda Absolute Temperature History Table -1 - Western Digital Ultrastar DC HC310 Specifications

Byte Size Field Name
1:0 Word Format Version
3:2 Word Sampling Period
5:4 Word Interval
6 Byte Max Op Limit
7 Byte Over Limit
8 Byte Min Op Limit
9 Byte Under Limit
29:10 Byte[20] Reserved
31:30 Word Queue Size
33:32 Word Queue Index

Table 71 Data Format of HDA Absolute Temperature History Table -1

Byte Size
(Queue Byte[Queue Size]
Size+33):34
511 Byte
(Queue Size +34) [512-Queue Size-34]
Description
Data table format version (=0002h)
Absolute HDA Temperature sampling period in minutes.
0000h indicates sampling is disabled.
Timer interval between entries in the history queue.
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.
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.
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.
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.
Number of entry locations in history queue.
This value is 128.
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.
Field Name
Queue Buffer
Reserved
Western Digital Hard Disk Drive OEM Specification
Description
This is a circular buffer of absolute HDA
Temperature values. These are one byte 2's
complement numbers, which allow a range from
-127°C to +127°C to be specified. A value of 80h
indicates an initial value or a discontinuity in
temperature recording.
The Actual time between samples may vary
because commands may not be interrupted. The
sampling period is the minimum time between
samples. See Note 1.
If the host changes the logging interval using the
volatile option, the interval between entries in the
queue may change between power cycles with no
indication to the host.
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