WESTERN DIGITAL WD4001FFSX RED Pro 4TB NAS 64MB cache SATA 6.0Gb/s 3.5" internal hard drive Bare Drive

This item is not from the Western Digital Store. It is a third party seller masquerading as Western Digital. Cost to ship and costs to return obsolete product. No return label yet. Reported to Amazon for removal.

Using in Synology NAS. Works great, no issues, have had three of these for two and a half years and added another this year. No problems with any of them so far running 24/7.