Best 4TB NAS hard drives
Drive Capacity Tech Class Interface AFR $/TB Price
1 WD40EFPX
WD Red Plus
4 TB CMR NAS SATA - $87.50 $350
2 WD4005FFBX
WD Red Pro
4 TB CMR NAS-Pro SATA - $103.61 $414
3 WD4004FRYZ
WD Gold
4 TB CMR Enterprise SATA - - -
4 ST4000VN006
Seagate IronWolf
4 TB CMR NAS SATA - $57.83 $231
5 ST4000NT001
Seagate IronWolf Pro
4 TB CMR NAS-Pro SATA - $67.50 $270
6 ST4000VX016
Seagate SkyHawk
4 TB CMR Surveillance SATA - $46.00 $184
7 HDWG440
Toshiba N300
4 TB CMR NAS SATA - $82.07 $328
8 HDWR440
Toshiba X300
4 TB CMR Desktop SATA - - -
9 WD40EZAX
WD Blue
4 TB CMR Desktop SATA - $45.00 $180

Ranked by measured failure rate (Backblaze AFR). $/TB uses the cheapest live price where available.

Every drive here is a CMR (RAID-safe) 4TB model in current production. For a NAS or RAID array, pick the lowest failure rate you can afford; enterprise drives (Exos, Ultrastar, MG) trade some noise and power draw for the longest workload ratings. See how to choose a NAS drive for the full rundown.

Frequently asked questions

What is the most reliable 4TB NAS drive?
None of the 4TB drives have large-scale Backblaze failure data yet; choose by manufacturer class and warranty.
Are 4TB NAS drives CMR or SMR?
Every 4TB drive we recommend for NAS use is CMR (conventional recording), the RAID-safe choice. We exclude SMR drives from NAS picks.