Western Digital has recently sent the all-new WD Red SN700 for us to review. This new drive was recently added to their line-up and was designed for high endurance, caching driving that helps accelerate NAS performance. WD built this drive with the idea in mind to support NAS environments 24/7 with applications always running. This drive was made for reliability and endurance up to 5,100 TBW (4TB model).