NewerTech Guardian MAXimus FireWire&reg; 800/400+USB 2.0 Hardware RAID-1 (Mirrored) Data Redundant Solution Whisper quiet operation Front panel drive status LEDs Apple/Mac or PC with available FireWire or USB port Shock resistant design Up to 64MB of drive cache (32MB per drive)* US/International 100~240V 4.2A UL Listed power supply FireWire 800/400+USB 2.0 Hardware RAID-1 (Mirrored) backwards compatible with USB 1.1 Up to 1.0TB Dual-Drive Solution* Custom Oxford 924 Based Bridge Solution