Micro Solutions Back Pack CD wioter and rewriter Portable. This driver is fot yhe use od the USB connection which does not come with the portable writer. If USB cable is purchased and is not working this driver will immediately fix the problem. It also works with the printer port connexction which at times will losse it's function with no known cause. The error message is (This CD writer is not connected or has a conflict with another CD Rom device) Works every time.