Yeah that "thinking" sound you're hearing is the heads seeking on the platters. While you should hear some clicking on a mechanical hard drive, if it's getting really loud--that's bad. I have just NVME drives on this machine but put SSDs on my hoopty retro (98&XP) pc too. Quiet.
If it's just clicking away while you're basically doing nothing might want to see if there's something running in the background that's causing it too. Could be that porn site giving you a gift that keeps on giving! Start the task manager and look in the processes tab. Click on the cpu column so it sorts by the highest load programs. See anything there that you don't recognize or don't need running? Something that's got a really high percent number? Google it if you're not sure and find out what it is. If you don't want it running, right click on it and select end task. See if the crazy clicking stops. BTW, that cpu load at idle should be something like a few percent. And killing a program here might not kill it for long. It may pop right back up depending on what it is. If you haven't killed the service or stopped it at startup it'll come back at next boot.
Go to the startup tab and disable anything you don't want starting with windows.
Services are another thing. Lots of stuff there you don't need running all the time. Just taking away clock cycles from your CPU and making your hard drive and internet work for nothing. Google "black viper" . That page had guides for each version of windows which shows services you can just disable. It's like free performance. SOP for me.
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