WD ensures a 1.2 million-hour MTBF rating and does an extended thermal burn-in test on the WD RE. In addition, what WD is calling NoTouch load ramp technology keeps the recording heads off of the disks, while dynamic fly height technology helps keep the heads at an optimal height at all times.To further protect the drive, WD included a multi-axis shock sensor to adjust for any shock events as well as StableTrac technology that reduces vibrations by securing and dampening the motor shaft at both ends.While the above will certainly help ensure the longevity of the WD RE, data integrity is just as important. To that end, the drive features dual actuator technology that more accurately positions the heads over the proper track--one actuator essentially puts the head in the right spot while the other further fine tunes the positioning. RAFF technology, which is also present on this drive, dynamically detects and corrects for linear and rotational vibrations for better performance even in environments with more movement than average.Finally, the 4TB WD RE is ideal for enterprise environments because they pack in impressive storage density. A single 3.5-inch HDD offers 4TB of storage thanks to five 800GB platters.Note that there are other iterations of the WD RE that come in 3TB, 2TB, 1TB, 500GB, and 250GB capacities as well, in addition to 4TB and 1TB WD RE drives with SAS interfaces.