Some cards are just flakey like that. On the other hand, perhaps the Plextar just isn't capable of handling a 4Gb card just like the Book Port wasn't until relatively recently. ----- Original Message ----- From: "David Lepofsky" <dlepofsky@xxxxxxxxxxxx> To: <bookport@xxxxxxxxxxxxx> Sent: Saturday, November 25, 2006 2:54 PM Subject: [bookport] Re: transferring data from a 2 gig to 4 gig CF card any idea why a 4 gigcard would work in the bookport but not the ptr?