Western Digital 6TB Red (WD60EFAX) Ideal for Home Offices, Power Users, Small to Medium Businesses and Consumer/Commercial NAS systems For RAID-optimized NAS systems with up to 8 bays Rated for 180TB/year workload1 and 1M hours MTBF Capacity - 6TB Form Factor - 3.5-Inch Connector - SATA RAID-optimized NAS systems with up to 8 bays Interface - SATA Transfer Rate - up to 180MB/s Disk Speed (RPM) - 5400 RPM Recording Technology - SMR Cache Size - 256MB Dimensions (L x W x H) - 5.79" x 4" x 1.03" Weight - 1.4lbs