The ECESATA254F Flush Mount 2-Port eSATA Express Card Adapter uses a unique slim 54mm form factor design that allows it to sit fully in a standard laptop Express Card/54 slot without sticking out. When installed, the ports sit flush with the sides of the laptop, creating a seamless add-on that can be left installed at all times, without fear that it or the card slot will be damaged due to snagging or impact. The eSATA Express Card adapter features 2 independent eSATA ports, and is compatible with the latest high capacity SATA drives (SATA I, SATA II) with support for data transfer speeds up to 3 Gbps. With support for Port Multiplier technology and hot-swap installation, the eSATA Express Card allows compatible multi-drive enclosures to be connected over a single eSATA cable, and devices can be connected and disconnected without having to reboot the system.