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Recording method and stated workload rating are what separate these from desktop drives

The best NAS hard drives for 2026

Drives sold for a NAS differ from desktop drives in ways the makers publish plainly, and the differences repay reading because the price gap is real. The first is the recording method. Conventional recording, CMR, writes tracks side by side; shingled recording, SMR, overlaps them for density and rewrites neighbouring tracks when data changes, which behaves quite differently under sustained writing. Makers now state which a model uses, and inside a multi-drive enclosure that answer changes what happens while an array rebuilds. The second is the stated workload rating, published in terabytes written and read per year, which describes the duty the drive is specified for and is not a countdown to anything. Beside it sits MTBF, a population statistic in hours that says nothing about one particular drive, and the warranty, a commercial term. Three different things, and none of them a lifespan. Then the ordinary figures. Capacity is published in terabytes of a thousand billion bytes each, which is why a drive appears smaller once an operating system displays it in units of 1024; nothing is missing, the two are different units for the same count of bytes, and the figure quoted here is the maker's in the maker's unit. Rotational speed in revolutions per minute, cache size, the SATA interface, and whether the drive is helium-sealed, which changes power and heat at the large capacities. Vibration tolerance is published for multi-bay use. We compare capacity, recording method, stated workload rating, rotational speed, cache size, interface, warranty length, stated MTBF, stated idle power and stated acoustic figure.

The ones worth installing

  1. Hitachi MegaScale DC 4 TB, refurbished, with a stated MTBF and no warranty term

    4 TB · 5700 rpm · 64 MB cache · SATA 6 Gb/s · 800,000 hours MTBF · refurbished with no operating hours · recording method not published

    A refurbished four-terabyte drive that publishes a rotational speed, a cache figure and an MTBF, and that names neither its recording method nor any warranty term.

    Best for: A bulk volume in a multi-drive enclosure where the workload is light and steady, bought by someone who has already decided how they will handle a failure.

    ≈ 130 €

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  2. Seagate IronWolf 4 TB, with three years of warranty and no rotational speed

    4 TB · SATA 6 Gb/s · 1 million hours MTBF · three-year warranty with data recovery · no rpm figure · range figures printed beside the model figures

    A four-terabyte drive for enclosures that publishes an MTBF, a warranty term and a recovery service, and whose only cache and capacity figures in the bullets belong to the range rather than to this model.

    Best for: A multi-bay enclosure where a published warranty and a recovery service matter more than knowing every figure, and where the drive will be one of several.

    ≈ $190 / £170 / 205 €

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  3. Western Digital Red Plus 4 TB, 5400 rpm, with five bullets and no second figure

    4 TB · 5400 rpm · SATA 6 Gb/s · tuned for enclosure workloads · no cache, no MTBF, no warranty, no recording method

    A four-terabyte drive for enclosures whose title carries every figure the page has, and whose five bullets describe continuous operation, compatibility testing and lower running costs without printing a single value.

    Best for: A quiet enclosure in a lived-in room where the slower spindle is wanted deliberately, bought by someone who will get the remaining figures from the maker’s own datasheet.

    ≈ $195 / £205 / 210 €

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Every price named in a summary was read on the date that review carries. What a shop asks today is shown beside the product, and it moves.