Thanks Unitron!!!!I was able to find a PC with an unused power and SATA ports that I can use for the new 2TB drive. I'm going to disconnect the main HDD and connect its power and SATA to the drive from TIVO. UPS will be delivering the HD today, so, will try the upgrade tomorrow. I see some posts where the WDidle3 command was being asked to run on the new HD. Is this still needed??