I'm about to replace my macbook hard drive (upgrading to more space). I saw that the internal drive my computer came with has a thin metal cover over it, along with a little slip of plastic to let you easily pull it out. I don't have a cover, and I don't have the tool I need to take the cover off. I was wondering if there would be any harm in installing this new hard drive without the cover\plastic slip. Is the cover necessary? Can I even take out the hard drive in the future without the slip?