Let's suppose for a minute that I just added a new hard disk into my system. For our example, we'll assume that it's and 10Gb slave drive on the first ide channel. I want to create a place to store some of my important files. I decide that this will be under my home directory, so I create a directory that will become the mountpoint for a new filesystem called myfiles. So the full path to this directory is /home/myusername/myfiles. Before I can use this new drive, I need to create a filesystem.