By installing this eSATA PCI Card in your desktop PC, you have immediate access to 2 high speed eSATA connections for external Serial ATA storage equipment and 2 internal SATA connections. Because the Serial ATA standard enables a transfer speed of up to as much as 150 MB per second, optimal ease of use is guaranteed. Certainly if you use large files, such as music and films, copying and saving become as simple as anything, and watching and listening become extremely comfortable!