StarTech.com External eSATA 2 port / internal SATA 2 port expansion PCI Experss card Port multiplier compatible Port can be switched with jumper

Expand your storage capacity: 2-port PCIe SATA, eSATA controller card that supports two internal SATA or external (eSATA) drives via PCI Express. A cost-effective solution for expanding system storage capacity
Built-in ASM1061 Controller: SATA/eSATA controller card with dedicated chipset that can expand two switchable SATA/eSATA 6Gbps ports via one PCIe x1 slot. Supports FIS-based port multiplier (PM), command-based switching, NCQ, ATA/ATAPI commands Wide compatibility: Supports Windows and standard SATA, eSATA SSD (Solid State Drive), HDD (Hard Drive). Supports SATA 3.0 (6Gbps) or earlier versions. PCI Express 2.0 compliant
Easy setup: 2-port SATA/eSATA controller card that plugs into any standard or low-profile PCIe slot. Compatible with PCIe x1, x4, x8, x16 slots. Standard profile (pre-installed) & low profile bracket, 7-pin SATA cable included
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Upgrade your old PCI Express bus system to a system that can take advantage of high-speed SATA drives that support 6Gbps Add an internal SATA port to your computer system and connect it to your storage or optical drive Add a SATA port to a single PCI Express slot. Can be changed to internal port or external port according to system requirements and usage changes
* The port multiplier function is not supported on Mac OS.