Having both tray icons is normal. One icon should be the MS tray app, and the other is the ISD app. Either app will work with the ISD300 family, and both will likely work with the ISD200 family (the MS one might not work properly in rare cases with the ISD200 in certain OS's). The ISD app allows for proper stop/eject functionality in some rare cases. You can disable the appearance of one or the other using the app's options.