Interesting. Thanks for the link to the discussion. I feel sorry for that guy and his SSD. In any case, I'm not too worried about speed given that the Performa 630 is PIO only. I'm sure the connection will be the bottleneck and not the speed of modern SD cards or even the adapter for that matter. From what I can tell, a decent SD adapter costs more than a CF adapter, but CF cards are more expensive. The added benefit of SD is its ubiquity and the ability to plug it quite easily into a modern Mac (assuming you have HFS support in Disk Utility). I recently experienced the wonders of networking my LC III with a Power Mac G4 MDD. Installations have become so much easier!