In the FAQ at the top of the page here (which was updated, burt still outdated and this upgrade article; http://www.rosswalker.co.uk/tivo_upgrade/ All the WD green HDD's that were recommended seem to be discontinued. The confusing four letter model numbers (EURS, AURS, EURX etc.) don't make it any easier. Also, this "Advanced Format" that most of the new drives now have, is this a issue with the Series 3, especially the HD? If so, other than some jumper between pins 7 & 8, is there another workaround? .