Astrotek PCI Express x1 eSATA/SATA card, 1 x eSATA 3 Gb/s Port, 1 x shared Internal SATA 3Gb/s Port, Max. 3 Gb/s transfer rate per port, Support both SATA 1.5 Gb/s and 3 Gb/s HDD drives, PCI Express Base specification rev.1.0a compliant, Serial ATA AHCI specification rev.1.0 compliant, Serial ATA High Speed Serialized AT Attachment rev. 1.0a compliant, Serial ATA II : Extensions to Serial ATA 1.0a Rev.1.1 complaint, Gen2i and Gen2m Serial ATA II Electrical specification rev. 1.0 complaint, Bus master programming interface for IDE ATA controller compliant, Supports Native Command Queue(NCQ), Support Hot Plug, Drivers support Windows 2000 or above, MAC OS X 10.4.3, Linux, Unix SCO/Solaris