WD Red Pro hard drives have been specially developed for NAS servers for medium to large companies. The large amount of data you can store on one of these Pro disks ensures that you store all data of your organization in one point. You can easily run these drives 24/7 in a RAID setup, for example. These drives are durable, so you can write a lot of data and have a longer lifespan than an average hard drive for your NAS.