I use CF cards, but both will work for the BrailleNote. The Braille Lite m40 that I own will only use compact flash cards and only certain brands. I don't understand, but it likes Sandisk but some other cards don't work. I have one 128mb card and one 512mb one. Most of my books are on the bigger card. It is fun to have a whole library with me, though I haveeven more books on the computer. -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.17/731 - Release Date: 3/23/2007 3:27 PM