This is an add-on board for Cubieboard/Cubieboard A20. The aim of the board is that power supply to Hard Disk. So that you can connect your HDD to Cubieboard without another power supply. Features: Easy to combine Hard Disk with Cubieboard Small board for 3.5 inch HDD on Cubieboard&Cubietruck 12V to 5V Includes: 1x 12V to 5V Subboard 1x SATA Cable 1x male to male 2.54mm Cable Documents: Wiki PCB file Schematic file