Sharon: Not all cards have the switches, so if you're not aware of it, then your card probably doesn't have one. Usually, they control whether the card functions as a 2 gig card or a 4 gig card. For best performance, it is our recommendation that you should always format any card in the Book Port, before using it for the first time--especially with the latest firmware and software (Version 2.3, as it is more stable with the larger compact flash cards). Thanks, Sharon. This job brings many challenges, but often, great rewards--especially when we can help others with success. . Have a great day! Sincerely, Pamela Rader, TECHNICAL SUPPORT American Printing House For The Blind 1839 Frankfort Ave. Louisville, KY 40206 PHONE: 1-800-223-1839, Ext. 307 >>> scfinchum@xxxxxxxxxxxxx 11/16/06 03:24PM >>> Dear Pamela, I am planning to buy a 4 gig card. I have never heard of needing to set a switch. Should I reformat before using the card and, if so, will that automatically take care of any switch that may need set? Over the years, I have found much of your advice quite useful. Allow me to take this opportunity to thank you. Make it a great one Sharon