Open the box and see if it scratches the inner layer. If not, there is a trademark on the fan. Tear off the trademark and there will be axial clearance. Find some oil to drip in. Don't drip too much. Two or four drops is enough. Try again.

There is a pointer on the hard disk. When searching for a file, the pointer must be rotated on the hard disk to find the file. After the new hard disk is improved, there is no such noise. This also means that yours is an old-fashioned hard drive.

Of course, according to the sound characteristics you described, it should be the sound of the hard disk. If there is, it should be said that it is a normal phenomenon. It just means you're an old hard drive.