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# Since USB 2.0 Hi-Speed is an evolution of the existing USB 1.1 specification, it is fully forward and backward compatible with current USB systems. # If your computer’s USB controller is only USB1.1 you can only achieve a 4X maximum CD writing speed. # If you do not have a USB2.0 port, you may install an optional USB2.0 adapter or controller (see optional accessories section on page 13) to your computer to achieve the maximum DVD CD writing speed. USB interface cable installation Attach the US