There are timing and error reporting differences between the various 2TB WD green drives (EARS, EADS, EURS) that could affect performance. Some drives are faster and some drives approach error reporting and recovery differently. This is appropriate as drives are designed for different purposes, such as A/V.
Also, there could be a renegotiation of the HDMI video signal. If this is the cause, it might help to set the Tivo to a single "Video output format", such as 1080i or 720p.
Premiere+1TB;HD+1TB;M-Cards;S2DT; Sharp LC46D65U; Sharp LC32D47U; VIZIO E370VA