Reformatting would be a near-last resort because there's so much you have to do before reformatting (saving files and config info) and after (reinstalling everything :bleh: )...
First thing is top back up all your important files, then try running a defrag on the drive... It may be that your disc is so fragmented that the noise is from the heads jumping around to access data...
First thing is top back up all your important files, then try running a defrag on the drive... It may be that your disc is so fragmented that the noise is from the heads jumping around to access data...