i currently have windows 7 on a 1TB HDD, i'm thinking about adding another HDD or maybe even SSD to my pc, i'm going to be installing windows 7 on to this too, but when i set up my new HDD or SSD i will unplug my current one so it wont get in the way of installation files etc, but when i plug it back in will both drives collide as i imagine they will be both called C:?