Wd red is designed specifically for nas systems that have 1 to 8 drive bays in both 35 inch and 25 inch form factors the drives are designed and extensively tested for compatibility in the unique 24x7operating environment and for the demanding system requirements of home and small office nas hard drivehard drive interface serial ata iiidrive device buffer size 64 mbintellipower yesmean time between failures mtbf 1000000 hstartstop cycles 600000device type hdddata transfer rate 6 gbitscertifica