When I plug an SD card into my E drive, I am able to view the files that on it and load them into my Picassa program. When I'm through I can safely remove the card. When I insert another SD card in the same drive nothing happens. The drive is not accessable via My Computer. I have to reboot my computer to again see my E drive. I have an eMachines computer running XP Home edition. What am I doing wrong?