Review on Reliable Western Digital 6TB WD Red NAS Internal Hard Drive - High Capacity, Smooth Performance, and Advanced Technology by Wiktor Wnkowicz ᠌

Used for Synology home NAS. Many write that it is slow because of SMR, but I have a four-disk array and video surveillance is not used, so there is a margin for speed. NAS is used to store shared documents, as well as video / photo / music storage in a fairly large volume with access from many places. The EFRX series was bought several times from different batches - almost all of them are already out of order. Extremely unreliable. The EFAX series hasn't dropped out yet. The temperature in the same NAS array for EFAX is several degrees lower than EFRX.