External Connectors: 2 x eSATA Internal Connectors: 4 x SATA Transfer Rate: Up to 1.5Gb/s RAID: RAID 0/1/0+1/5 Operating Systems Supported: Windows 2000, Windows XP/2003/Vista 32/64 bit, Windows 7 32/64 bit (supported via Vista Drivers), Vista 32/64bit Features: Chipset: Silicon Image SiI3114 SATA controller chip Enterprise-class Throughput - With Ultra/150 Command Queuing technology that optimizes the sequence of data transfers to the hard drive from the host, resulting in higher performance in enterprise applications. Rugged - Enterprise-class mechanical platform with high-end bearings and actuator. It can work as a RAID 0/1/0+1/5 HDD controller card or an un-RAID extension card for SATA device (HDD or SATA optical drive).If you don't active the RAID function, you can attach 4 SATA HDD as a normal extension ...