I have a series 3HD TiVo. Model TCD652160. I also have a wesern digital external hard drive on it. My network connection failed with error message SO3. I didn't do any research before tring a force connect. Now it's stuck on "loading info (preparing to load). I then started reading up. It looks like my hard drive is bad and needs replacing. I looked on weaknees, they seem expensive. I found some hard drive upgrades on eBay at a decent price, but is a hard drive upgrade the same as replacing the hard drive? I was looking at getting a larger hard drive and leaving off the external hard drive since I think this may have helped cause my problem. I'm new to all this and I just don't want to order the wrong thing.