Compact flash (cf) Type 1, any capacity up to 4 gigs is good. I buy the Kingston brand. I have all sizes and use them for different types of media such as music which I put on the 4 gig cards. Books might go on the 1 or 2 gig cards. *---* *---* *---* *---* *---* If We See Smoke We Will Assume You Are On Fire and Take Appropriate Action. --sign in a non-smoking area Robert & Dreamer Doll ke7nwn E-mail- rclark0276@xxxxxxxxxxx Home Page- http://webpages.charter.net/dog_guide/