Sans Digital ST-SAN-TR4M+BNC TowerRAID TR4M+BNC Hard Drive Supports PC, Linux and MAC OS, including Windows 7 and Snow Leopard Accesses four hard drives using only one cable Host interface: eSATA with Port Multiplier Drive interface: 4 x 3.5" SATA I/SATA II Support port multiplier enabled RAID adapter for additional RAID application