The esataplt18in 18 inch 1 port sata to esata plate adapter adds external data support using an existing motherboard serial ata controller simply mount the plate to the rear panel of your computer case as an extension of the motherboard sata data connector in order to add a port for connecting external sata storage devices eg external esata hard drive designed to take advantage of the increased data integrity provided by external hard drives or raid devices that support esata connections