My TiVo HD has the stock hdd, with a 500gb (tivo supplied western digital) eSata external drive. This system is a few years old and I'm getting concerned that the disks won't last for ever, so I would like to backup or upgrade before they go bad. I'm wondering if its possible to upgrade to a single 1 or 2tb drive, eliminating the need for the external drive, while preserving the content that is currently striped across both the internal and external drives. To put it another way, I would like to merge the data from the existing pair of disks onto a single 1/2TB internal drive. Is that possible?