HDD Sound?
So when your laptop is on battery power, Windows has a feature that will stop the HDD from spinning to save power. Then it only starts up when it needs to do something from the disk, but this means the HDD will be slower since it has to ramp up to the RPM it needs (usually 5400 RPM for laptops)
The HDD will only go from 0-5400 RPM and stays at 5400RPM.
When you plug in the laptop, Windows is like "hey I don't need to save power anymore" so it will run the HDD all the time to speed up performance.
You can go into the "Power Options" of the PC and under "When my PC is plugged in", somewhere in the advanced settings there's one called "turn off my hard disks" (setting it to 0 means keep spinning always)
Switching to an SSD will completely remove the noise as they make no sound at all.

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