Advertisements Keep in mind that there is no guarantee a new hard disk will fix your problem. It is likely that it will, but you haven't described your symptoms, so it's hard to know. The simpliest solution is to go buy a pre-imaged drive for your system from one of the upgrade vendors. You'll pay more than for a bare drive, but this approach may be worth considering if you are nervous about a completely DIY solution. A cheaper way is to buy a bare harddrive and put the tivo software image on it yourself. A 320GB drive -- 4 times your original capacity -- runs about $100. You can buy a tivo software image from PTVUpgrade for ~ $20. They call the product "Instant Cake" be sure you select the right tivo model. You can also find a free tivo software image on the ed2k peer-to-peer network if you look around. Tivo frowns upon sharing of tivo software images, so they are a little hard to find. There is some possibility of getting a "bad" image this way. The usual symptom of a bad image is that the menus are "transparent" and you see live tv behind them instead of the usual tivo background animations. Again, be sure you get an image that is for your hardware model. An sd-h400 is also known as a "264" model -- based on the first three digits of the tivo service number. If you DIY using a downloaded image, follow the weaknees upgrade instructions for restoring from a backup. There are other instructions out there, but some of them are not up to date and don't work correctly with large disks.