At what temperature is the hard disk healthier?

About 40 is the best, 50 degrees is barely acceptable, but it is on the high side. Now it's summer, and I'm worried about the temperature of the hard disk again ~ ~ You can download a high-definition tone, which can detect all the parameters of the hard disk, including the temperature! Ps: My hard disk is 49 degrees. I am so depressed that I dare not play for too long in a day.