Upgrade your computer to extremely fast SATA II compatibility with this PCI-Express card. Perfect for connecting a LaCie Biggest S1S, Biggest S2S or d2 eSATA II 3Gbits Hard Drive to your computer, it's also compatible with non-LaCie eSATA devices. Once installed, the card supports eSATA hot plug/unplug, Native Command Queuing (NCQ), port multiplication and PC bootability. With 2 eSATA ports, you can connect two devices at once. Whether you use Windows or Mac, it quickly brings the impressive speed and high performance of this superior interface to your system. Transfer Rate - up to 3Gbits/s (300MB/s) per port System requirements - Available PCI-Express (x1) slot Mac OS X v10.4.5 or Windows 2000/XP Dimensions - 3.39 x 4.73 x 0.86 in