1 plies with USB 2.0 and backward USB 1.1 2. Complies with ATA/ATAPI-6 Spe. V1.0 3. Complies with USB Storage Glass spec.1.0 4. Supports transfer rates of 480/12/1.5 Mbps 5. professional switch power,input voltage scope of AC90V-264V 6. OS supported:Win XP/2000/ME/98;Mac OS 9.2 /X/;Linux 7. External power adapter for the IDE/ATAPI device