Difference between Type I and Type II CF CardsThe only difference between a Type I and a Type II Compact Flash memory card is the thickness of the card. The Type II card is slightly thicker (5mm versus 3mm): The Type 2 card (on the left) is slight thicker than a Type 1 cardThere are no inherent speed, size or other advantages between the two sizes. Originally the Type II cards had higher capacity, but currently there are extremely high capacity Type I cards. Refer to individual cards for their size and speed characteristics. Be sure that the camera, card reader or PC Card Adapter you wish to use is compatible with the Type II cards, as some are not.For card compatibility check the camera's manual for a list of approved cards. Print Share By Email Share By Social Ask A Question FaceBook Twitter