The general rule of computing is that no matter how large your hard drive is, it will eventually fill up and tell you that it’s out of space. While you can certainly add a new larger hard drive, another option might be cleaning up your old hard drive and get rid of all those giganto files. The problem is how do you “easily” find those large files and folders?
WinDirStat.info is one highly recommended program to do just that.
It may take a while to scan your drives, but when you check back, it will give you a visual picture of what is taking up all that space. Then you can move or delete those files and folders to give yourself more breathing room.