I have a Dell Lappy with a Fujitsu MHR2020At hd in it. It does it normal humming sound that I can't describe but then I can hear the arm clunking about 3 to 20 seconds. Clunk--hum---hum---hum---hum---clunk---hum---hum---clunk---hum---clunk.
On various error checking times it showed up with O bad sectors.
Is this drive looking for something it can't find so it clunks? This is a fresh install of Windows.

Or is it magnetically confused so the arm goes back and forth and clunks?

Is this drive going bad even though the PC runs well?