It would make a difference in formatting, because the FAT system parameters would be different. I know with testing that we've done here, it made a difference if the switch was in the wrong place. Pamela Rader, TECHNICAL SUPPORT American Printing House For The Blind 1839 Frankfort Ave. Louisville, KY 40206 PHONE: 1-800-223-1839, Ext. 307 >>> SimonJaeger@xxxxxxx 12/12/06 09:54AM >>> Hi, Just a quick question, what happens if you try to switch the switch on a 4 GB flash card to make it 2 2-gb ones and put it in the book port? Does only one work, do they both show up somehow, or does it not even make a difference?