PNY P-NSA2-PCM-RF 2-Port eSATA Card Bus Connect 2 external SATA hard drives to your notebook computer ,This card supports data transfer rate of 150MB/second Supports Hot-Plugging 150MB/second is faster than USB, Firewire, or PATA ,SATA transfers at up to 1200Mbit/second versus USB 2.0 at 480 Mbit/second Supports SATA hard disk hot-plugging ,Windows Vista compliant, also Windows 2000, and XP The card has 2 External ports (I shaped)