I am contemplating expanding the storage on my Roamio Plus. An external eSATA drive seems least painful from an install/moving recordings an internal replacement would require. Is the Roamio limited to the My Book AV DVR Expander from Western Digital? I no longer have a functional PC with eSATA drive ports, so I might be a bit limited on a winmfs-based approach. What are my options? Should I just bite the bullet and switch out the internal drive??