Wd red hard drives for nas 35 inch sata 6 gbs 64 mb cache the right choice for personalsmall officehome office network attached storage wd nas internal hard drives are the essential solution for nas applications these drives are cool and quiet and offer optimum compatibility in 24x7 nas systems with up to eight bays storage for 1 to 8 bay nas solutions wd red is designed specifically for nas systems that have 1 to 8 drive bays in both 35 inch and 25 inch form factor