I do have the Hogan book. I don't think that it addresses the Lexar 800x cards, which, as mentioned above, seem are the ones with such disparity between read and write speeds. With the help offered above and paying a little more attention to the specs of the cards I think I have gained enough information to know what to do. So I ordered 2 Lexar 16 GB 1000x cards. I plan to shoot only compactflash cards.