External Connectors: 2 x eSATA Transfer Rate: Up to 3Gb/s RAID: 0,1,5,10,5+Spare, and 10+Spare Operating Systems Supported: Windows 32&64-bit XP/2003/Vista/7, Mac OS X 10.4.9/10.4.10/10.5.1/10.6.x Features: RoHS Compliance Version: Yes Support iStarUSA eSATA Storage Enclosure. Fully Compliant with SATA I/II Standard. Support up to 10 Hard Drives with Port Multiplier Support. Support Silicon Image Port Multiplier SiI3726. Chipset: Sil3132 PCIe x1 (PCI Express 1.1, compatible with a PCI Express 2.0 slot). Parts: 3 years limited