Hi, I have a Mac running Snow Leopard 10.6 and when I plug the Pocketbook in.. it shows as two drives.. the internal drive and the sdcard. "see the attached screenshot" If you have Windows running and use Parallels..at the top of your screen , you should see "Devices" on the menubar click "USB" and uncheck the Pocketbook.. then you should get a box that will make it show up on the Mac side. Hope that helps.. and yes, I can open both drives and add or remove things on the mac . ( without using windows)