ACARD ARS2000SUP_500GB HD 3.5" Ultra SCSI 50 Pin . Support Windows NT / 2000 / XP / 2003 / Vista, Linux, Mac and SUN operating systems . Easy to install and use . Cost-effective and offers better I/O performance Specifications: . Ultra SCSI interface - supports Data transfers at up to 20MB/sec . 50 pins Ultra SCSI interface . Support industrial-grade computers . Bulid in flash ROM for easy firmware upgrade . Selectable SCSI ID from 0 to 7