Hi, Others have said you can use a 4gb card with the BP. The only thing is that you have to format it in a card reader rather than the BP. If you do not format it in the BP, the unit will see all 4gb. Angie On Fri, 18 Feb 2005 16:02:20 -0600, Clarence Whaley wrote: >Melissa, go with the 2 gig card. The BookPort can only use that size at >max. It will see a 4 gig but will only use 2 gig of it.