Seagate IronWolf Pro 28TB NAS Drive Review UK 2026

The NAS drive market has become seriously crowded. You’ve got options from 4TB right up to ridiculous capacities, and picking the right one isn’t just about raw storage. After two weeks with Seagate’s IronWolf Pro 28TB, I’ve got a clear picture of whether this massive drive justifies its place in your setup.

The drive uses SATA 6Gb/s connectivity (nothing unusual there) and runs at 7200 RPM. Some people obsess over RPM numbers, but honestly, for NAS work, the optimisation firmware matters more than raw spindle speed.

The RV sensors are less obvious but equally important. When you’ve got multiple drives spinning in close proximity, they create vibration that can affect each other’s performance. The sensors detect this and adjust head positioning to compensate. You won’t notice it working, but you’d definitely notice if it wasn’t there – performance would degrade over time as drives interfere with each other.

Performance is… exactly what you’d expect from a 7200 RPM NAS drive. Sequential speeds hover around 260 MB/s, which is pretty much the ceiling for mechanical drives. That’s enough to saturate a gigabit network connection with room to spare, so unless you’re running 10GbE, the drive isn’t your bottleneck.

Random access is where all HDDs struggle. The 4K random read/write numbers are typical for spinning rust – fine for sequential NAS workloads like media streaming or backups, but you wouldn’t want to run a database directly on this. (If you need random access performance, that’s what SSD cache tiers are for.)

What impressed me was consistency. During a 500GB sustained write test simulating a large backup operation, speeds stayed within 5% of the initial rate. No dramatic slowdowns, no thermal throttling. The drive just got on with it.

More relevant is the 300TB annual workload rating. That’s 25TB per month, which is genuinely heavy use. For context, streaming 4K content 24/7 would only hit about 20TB monthly. So unless you’re running a proper production environment, you’re unlikely to exceed the rated workload.

Temperature management is solid. In my DS920+ with two case fans, the drive stabilised at 40°C during sustained operations. That’s warm but well within spec (Seagate rates these up to 70°C). Acoustic performance is typical for a 7200 RPM drive – you can hear it seeking if you’re in the same room, but it’s not obnoxious. Definitely quieter than older WD Reds I’ve used.

The real test is how it behaves over time. After two weeks of continuous operation (including several RAID scrubs, large file transfers, and constant Plex streaming), it’s been completely transparent. Which is exactly what you want from a NAS drive. The best storage is storage you never think about.

WD does offer a larger cache (512MB vs 256MB), which can help with certain workloads, particularly multi-user access patterns. In practice, I haven’t found cache size to be the limiting factor for typical NAS use – network speed and RAID overhead matter more.

The Toshiba N300 is the value option here. At 18TB, it’s substantially cheaper per drive, but you’re also getting a lower workload rating (180TB/year vs 300TB/year) and shorter warranty (3 years vs 5 years). For a light-duty home NAS, that’s probably fine. For anything approaching professional use, I’d want the extra headroom.

Personally, if I’m spending this much on drives, I want maximum capacity. The cost difference between 22TB and 28TB isn’t massive when you’re already at this price point, and the extra capacity gives you more runway before needing to upgrade your entire array.

Here’s the value equation: at current pricing, you’re paying roughly £21-23 per terabyte. That’s actually competitive with 18TB and 22TB drives when you do the maths. Where it gets expensive is the absolute cost – you need serious budget to populate even a 4-bay NAS with these.

But there’s another angle to consider. If you’ve got limited drive bays, maximising capacity per bay has real value. A 4-bay NAS with 28TB drives gives you 112TB total capacity. To get the same capacity with 14TB drives, you’d need an 8-bay chassis, which costs significantly more than the drive price difference.