Adds 2 eSATA ports to a laptop through a CardBus slot. This 2 port CardBus eSATA Adapter offers a cost-effective external storage solution that allows eSATA laptop connections to external SATA devices.The eSATA laptop (PCMCIA) adapter is ideal for making routine backups or dumping data to SATA hard drives.The eSATA CardBus Adapter presents a convenient way to protect your valuable data, with full external SATA data transfer speeds of up to 150MBps.