The WDS500G2B0A. is the manufacturer part number for theWestern Digital Blue 3D NAND 500GB Internal SATA SSD. Flash Type : 64-layer 3D TLC NAND. Interface : SATA III (6 Gb/s). Power Efficiency : Features DEVSLP low-power modes, drawing up to 25% less active power than previous generations of WD Blue drives to preserve laptop battery life.