What does Temperature_Celsius (ID 194) track?

• A. Power-on hours.
• B. Drive temperature; high temps accelerate failure.
• C. Self-test results.
• D. Read error rate.

Answer: (B)

The main concept here is that Temperature_Celsius shows the drive’s current temperature in Celsius. This reading is used to monitor cooling and thermal conditions, because higher temperatures accelerate wear and can raise the risk of failure over time. So the best match is that it tracks drive temperature and the idea that high temps speed up failure.

The other aspects refer to different SMART data: power-on hours tell you how long the drive has been powered on, self-test results come from diagnostic tests, and read error rate tracks how often reads fail. Temperature_Celsius is not about time, test outcomes, or error counts—it’s about heat.