SIIG's eSATA II PCIe Pro is a superior controller card for expanding your SATA storage capacity to your PCIe-equipped desktop computer. It is designed to add two external SATA channels for connecting up to two additional SATA hard disk drives. The eSATA II PCIe Pro controller card features the latest eSATA connector, delivers high speed data transfer rates of up to 3.0Gb/s. It supports 48-bit LBA to support hard disk drives with capacity larger than 137GB, independent command fetch, scatter/gather, and command execution. Other features include Integrated Serial ATA Link, PHY logic, Native Command Queuing (NCQ), Non-zero offsets NCQ, Out-of-order data delivery NCQ, and eSATA hard disk hot-plugging.