Seagate 300 GB 3.5" External SATA Hard Drive 8MB Cache ST3300601XS-RK "Up to 5 times faster than Firewire 1394 and USB 2.0. 3Gb/s eSATA cuts backup time by up to 5X when compared to USB Provides optimum performance and capacity for massive data transfers and real0time video editing. "Exclusive Native Command Queuing (NCQ) technology maximizes drive The included PCI-X to SATA host adapter card provides ports to connect up to 2 high performance eSATA drives. Compatible with PC and Mac.