The External Serial ATA (eSATA) is the latest form of computer connectivity featuring faster transfer speeds, easier configuration, and better ability to hot-swap devices. The Dual eSATA ports PCMCIA CardBus supplies the interface converter for laptops. With the eSATA port, the PCMCIA Card Bus adapter gives the flexibility of adding a high speed connection to an external hard disk drive and other eSATA devices. The USB 2.0 just supports transfer rate up to 480Mbps. However, eSATA interface can support transfer rate up to amazing 1.5Gbps!