MY Hard disk is creating a buzzing sound

Hi there again!
My 500gb Hard Disk has become noisy and creating a buzzing sound these past few days and I’m worried that there might be something wrong with it. I tried checking it by removing it from the unit and shaking it if there is some loose components inside. I found out that it is still intact so I attach it again to the unit and there it is again. My computer still functions and still loading but I noticed that it took longer than usual to load the desktop…what’s wrong? Is it time for me to replace my hard disk? By the way my hard disk is only 6 months old
