My tivo keeps crashing and it looks like its a hard drive problem. Anyway Tivo are replacing it but don't have one at the moment to replace it with. How long does this take on average and why don't they have a replacement in stock. Seems a bit poor. Also what sort of condition have people received them in. My original tivo is perfect and even has the plastic sheet on the front. I believe my existing Tivo is a dual hard drive machine and wondered if these were less reliable than the single drive machines because of the extra power consumption and less ventilation inside. The fault on my tivo only seems to kick in once the hard drive is about half full. Guessing just as it switches to the other hard drive. I'm guessing its a dual drive system as previously even when working well I would sometimes get a pause only on one program on the hard drive as if moving from one hard drive to the other. Very similar to a layer change on an early dvd player.