I recently purchased this card for use with my 533 Mhz DA in order to use a couple of new Seagate 250 Gb HD's. Upon installation of the card and drives I found I could not partition/format the drives. I got the "You need to restart your computer" message each time I tried. I repeated this entire scenario using 10.3.9 as well as 10.4.10 with the same results. SIIG support suggested using a 40 pin/40 wire cable instead of the 40 pin/80 wire cable they provided which did allow me to partition/format the drives to their full capacity. Of course using this cable negates the speed advantage which was why I switched from my B&W to the DA. Before I return this card to OWC for a different one I was wondering if anyone else had this problem and perhaps found a better remedy than using the different cable. Just a message from Doug...