12TB WD Red 3.5in SATA 7200rpm Int HDD With drives up to 12TB, the WD Red series offers a wide array of solutions for customers looking to build a high performing NAS storage solution. WD Red drives are built for up to 8-bay NAS systems, and pack the power to store your precious data in one powerhouse unit. Increase the efficiency and productivity of your business with WD Red Pro drives, available for up to 24-bay NAS systems. PC drives arent typically tested or designed for the rigors of a NAS system. Do right by your NAS and choose the drive with an array of features to help preserve your data and maintain optimum performance.