Features Transfer Rate up to 4TB: 217MB/s 8TB: 235MB/s Interface SATA Form Factor 3.5-Inch Disk Speed (RPM) 7200 RPM Recording Technology CMR Cache Size 256MB Ideal for creative pros, medium to large businesses, and commercial/enterprise NAS systems For RAID-optimized NAS systems with an unlimited number of bays Rated for 550TB/year workloads1 and up to 2.5M hours MTBF RAID-optimized NAS systems with unlimited # of bays