Filling a 4-bay NAS · updated 27 Oct 2026 · prices coming soon
Best hard drive for a 4-bay NAS
Our pick
Seagate IronWolf Pro 24 TB
Five years' warranty and a 550 TB a year workload rating, which is the strongest paper spec of the NAS lines we list.
- CMR
- 7,200 rpm
- 5-year warranty
- 550 TB/yr
- Any bay count
- No failure data
Why the Seagate IronWolf Pro 24 TB
Any of the 17 NAS-line CMR drives we list will do the job in a 4-bay box, so the question is what you pay per terabyte. Without prices to go on, the Seagate IronWolf Pro 24TB has the best paper spec, with five years' warranty and a 550 TB a year workload rating. There's no bay limit, so it'll move with you to a bigger box later.
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How we pick this one
Until prices land, it's the NAS-line CMR drive with the longest warranty and the heaviest workload rating, and the biggest of those. Right now 17 drives qualify, and the list re-ranks every time prices or Backblaze's figures update.