fzabkar wrote:
csava wrote:
However, other brands with a history of poor practices, such as Samsung and Western Digital, might only release firmware updates. These updates could adjust the offset of the temperature sensor (actual temperature 80 degrees Celsius, displayed as 65 degrees Celsius, offset -15 degrees Celsius)...
Are you referring to the "composite" temperature? IIUC, this is a value that is derived by computing a weighted average of all the temperature sensors on the drive. As such, it would be very subjective. For example, a manufacturer could lower the reported composite temperature by applying a lower weighting to the flash core without actually falsifying the core temperature reading.
No, I'm referring to the SMART reported by the controller, where the C2 option represents temperature. The lower 4 bits represent degrees Celsius, and typically, this temperature refers to the current temperature of the disk controller. A fully functional controller will have a thermocouple installed near the NAND flash on the PCB to measure the current temperature of the NAND flash. Controllers that typically support external temperature sensors will calibrate an option defined by the manufacturer. However, in practice, regardless of which value it is, controller manufacturers can freely change it to a fixed value, modify the offset, modify the multiplier, or determine an upper limit. This also applies to the 09 option reported by SMART.
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