We are lucky enough to have both the Lexar 40x 4 GB and Pretec 6 GB Compact Flash cards on hand and have performed a variety of tests on these very high capacity cards. While the Lexar 40x 4 GB is impressive the Pretec 6 GB is even more so considering that it is similar in design to IBM's Microdrive (both a miniature hard disks) but has trumped Hitachi-IBM's new 4 GB Microdrive both in capacity and time to market. The Lexar is likely only to appeal to professionals who require total reliability and performance, the Pretec may well find its way into all sorts of devices, not just digital cameras. We have compared these two cards with SanDisk's new Ultra II 1 GB card and the industry benchmark IBM Microdrive 1 GB.