I always wonder why does the arm running over the platters make that scratching noise after a while i hate it i want it to be silent looool

That skipping noise isn't really a good sign. I had a hard disk back in the Win98 era that did that and it would randomly have corrupt files, and sometimes it would corrupt the OS installation out of nowhere.

i always heard this was normal as the harddrive over time gathers physical errors on the surface