Recently I had a main board go dead on my TiVo. I confirmed that it wasn't the power supply or the drives by powering them independently (when I plugged in the main board, the power supply shit down). I have another TiVo box and desire to move the drives to that box, with all the shows that 800Gbytes stores. I have no problem with moving the access card to the new receiver, but my main concern is to not delete the existing programming on the unit. If necessary I can get a third drive (they have 1.5 TB drives locally) that I can transfer the data to if necessary. These drives originally were setup with instacake, and I started with a 120GB drive expanding to the two 400GB drives I have now (lots of space!). Any suggestions?

My wife is having withdrawal symptoms so a quick resolution would be nice.