And that about sums up my entire argument. You can show me all the statistics you want about whether a single Tivo drive will have a better chance of survival vs. two drives. The point is, you can't make any guarantees that drive A will have a shorter lifespan by itself or if it's paired with drive B. It might, but the impact will be minimal at best. Buying a hard drive is like rolling the dice. Sometimes you pick a winner and sometimes you roll craps. I've owned and modified literally dozens of Tivos over the past decade or so. The only drive failures I encountered were in single-drive configurations. Granted, the number of units used for comparison is relatively small for any test group, but this is what I experienced in real life. If using two drives is the only option available to you then all I'm saying is there's no compelling reason not to go with two drives. It's worked for me and lots of other Tivo owners. It took you long enough to finally agree with what I've been saying all along.