But if you copy all of the files associated with a single book; or set of books; from the CF card to the PC and then, to an SD card, all the bookmarks will be preserved. With a USB 2.0 card reader/burner, this should only take a minute or two. I just did this with a card that had several dozen books on it when my 4Gb CF card arrived. -----Original Message----- From: bookport-bounce@xxxxxxxxxxxxx [mailto:bookport-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Clark Sent: Sunday, July 15, 2007 12:07 AM To: bookport@xxxxxxxxxxxxx Subject: [bookport] Re: Batteries current vs. future Book Port Sandy, I dont know what the SD card looks like but they probably are not interchangeable with CF cards. And if I am not mistaken, all the bookmarks etc will be on the card that one is reading books on.