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The eSATA II PCIe Pro easily adds 2 external eSATA ports to your PCIe equipped desktop. This PCI Express 1-lane (x1) SATA II adapter works with PCI Express slots with different lane width. It installs in any available PCI Express slot and supports data transfer rates up to 3.0Gbps (300Mbps). Featuring the latest eSATA (external SATA) connectors to provide the mose convenient way to add high speed, high capacity hard disk drives, this card is RoHS compliant and supports hard disk hot-plugging. This card supports 48-bit LBA for drives with capacity larger than 137GB and supports two independent Serial ATA channels. It supports Native Command Queuing (NCQ), non-zero offsets NCQ, and out-of-order data delivery NCQ. It features integrated Serial ATA Link and PHY logic, as well as independent command fetch, scatter/gather, and command execution.