Uh, then why has TiVo been using AV-GP drives all this time? They are GreenPower drives as well, with an additional AV-rating. That's what the "GP" means in "AV-GP". Don't take it the wrong way. But, as you say, you're not up to speed on this. Before the AV-GP drives fell drastically in price, everybody was using the standard GreenPower drives, without the AV rating (less those who had the extra money to spend, and wanted the AV-GP).