Four eSATA (6Gb) Ports PCIe x4 V2 Host support Port Multiplier - eS3-PCIe24 Four eSATA (External SATA I II) ports (6Gbps - compatible with 3Gb PM bridge) Support MAC 10.x built-in AHCI, WindowXP to Windows 2012, Linux Kernel 2.6.x 4x lanes PCI Express V2 connection offering 20Gbps bandwidth Supports Port Multipliers with FIS based switching or Command Base Connect up to Twenty drives via SATAII or SATAIII Port Multiplier including SATA Drives, ODD or SSD