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5.2.4
Thermal monitor
Enterprise Capacity 3.5 HDD v4 drives implement a temperature warning system which:
1. Signals the host if the temperature exceeds a value which would threaten the drive.
2. Signals the host if the temperature exceeds a user-specified value.
3. Saves a S.M.A.R.T. data frame on the drive which exceeds the threatening temperature value.
A temperature sensor monitors the drive temperature and issues a warning over the interface when the temperature exceeds a set
threshold. The temperature is measured at power-up and then at ten-minute intervals after power-up.
The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the specified limit in compliance with
the SCSI standard. The drive temperature is reported in the FRU code field of mode sense data. Users can use this information to
determine if the warning is due to the temperature exceeding the drive threatening temperature or the user-specified temperature.
This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the Method of Reporting
Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC) mode page (1Ch).
The current algorithm implements two temperature trip points. The first trip point is set at 65°C which is the maximum temperature limit
according to the drive specification. The second trip point is user-selectable using the Log Select command. The reference temperature
parameter in the temperature log page (see Table 1) can be used to set this trip point. The default value for this drive is 65°C, however, the
user can set it to any value in the range of 0 to 65°C. If users specify a temperature greater than 65°C in this field, the temperature is
rounded down to 65°C. A sense code is sent to the host to indicate the rounding of the parameter field.
Table 1:
Temperature Log Page (0Dh)
Parameter Code
Description
Primary Temperature
0000h
Reference Temperature
0001h
5.2.5
Drive Self Test (DST)
Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a failed unit. DST validates the
functionality of the drive at a system level.
There are two test coverage options implemented in DST:
1. Extended test
2. Short test
The most thorough option is the extended test that performs various tests on the drive and scans every logical block address (LBA) of the
drive. The short test is time-restricted and limited in length—it does not scan the entire media surface, but does some fundamental tests
and scans portions of the media.
If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test, remove it from service and
return it to Seagate for service.
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