eSATA ports DO NOT provide power as part of their standard. Any eSATA drives you plug in will have to be powered either by an AC/DC adapter or by a USB to 5VDC connector. The Dell Latitude E Series laptops use a special eSATA/USB hybrid connector that lets the USB half of the port power the eSATA Drives. This special port is NOT part of any standard. In fact the USB portion of that eSATA port has to provide more than the standard 500mA of USB in order to power an eSATA Optical drive.