By Rick Broida Click to viewSo you finally replaced that overstuffed 80GB hard drive with a half-terabyte data warehouse. The question is, what do you do with the old drive? Stick it on a shelf? Toss it in the trash? Leave it in the machine? Nah. The best possible fate for an old internal drive is to become a super-handy external drive, which it can do with a small investment of time and money. An