You can't issue any commands on the Book Port when it is connected to the PC. Yes. Disconnect and reformat. Remember all of the files will be erased. The manual will be put back on, when you re-connect to the PC. Pamela Rader, TECHNICAL SUPPORT American Printing House For The Blind 1839 Frankfort Ave. Louisville, KY 40206 PHONE: 1-800-223-1839, Ext. 307 >>> TALMIDIM@xxxxxxxxxxxxxxxxxx 04/06/06 03:22PM >>> Before I do so does it make a difference whether or not the bookport is plugged into the usb port when I reformat the card?