hard drive light hp envy j020

Hi i noticed that the hard drive light on my envy j020 would flash orange sometimes.but after a little research i found not only is this normal,but what was causing it in my case.When playing loud music on my envy "with beats audio" the subwoofer on the botton of the laptop would actuly cause a little physical movment of my harddrive the orange light indicated that the hp 3D Drive Guard was activating to protect my drive this is absolutely normal. I hope this post helps someone.