WD400bb temperature

I have a 5+ year old wd400bb-75jhco on my PC.

The drive temp is at 48 degrees centigrade.

When I run a program like the new Piriform Defraggler it shows the health of the drive as “Good”.

Is this normal?

Should I be concerned?

Here are the specs for temperature.

Operating Temperature and Humidity
Temperature 2 5°C to 55°C (41°F to 131°F)
5°C to 65°C (case temp)
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