Well, my previous 1TB My Book AV DVR Expander from Western Digital went bad. When I sent it back for RMA, they sent me a 2 TB version of the My Book AV DVR Expander. Installed like normal and my Tivo Premier indicated that it saw an external storage device. However, after trying to set it up, my Tivo says its not supported. Tried rebooting, unplugging, different esata cable, updating through Tivo service, etc. But still won't pair up.
It even says on the box Tivo Compatible and it's model # WDBABT0020HBK-NESN