Hard Drives
WD Red Plus 4TB NAS 3.5" Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, CMR, 64MB Cache
Packed with power to handle the small- to medium-sized business NAS environments and increased workloads for SOHO Built and tested for up to 8-bay NAS systems, these drives give you the flexibility, versatility, and confidence in storing and sharing...
https://www.bizrate.co.uk/harddrives/wd-red-plus-4tb-nas-oid14365653530.html