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

Seagate IronWolf 4 TB (ST4000VN006) review

Name: Seagate IronWolf 4 TB (ST4000VN006)
Brand: Seagate
SKU: B09NHV3CK9

A four-terabyte, 5400 rpm CMR drive that publishes its cache, a transfer rate, an MTBF and a three-year warranty with data recovery — and no workload rating.

By Jean-Benoit Buisson

What the Amazon.com listing says

The title: IronWolf 4 TB, CMR, 3.5-inch, SATA 6 Gb/s, 5400 rpm, 64 MB cache, ST4000VN006. The bullets: up to 8 bays for multi-user NAS; capacity up to 16 TB and cache up to 256 MB across the range; less wear, little noise and vibration; IronWolf Health Management and 1 million hours MTBF; and a three-year limited warranty with three years of Rescue Data Recovery. The description adds speeds up to 180 MB/s and lower power consumption.

The shelf it sits on

Drive	Capacity	rpm	Cache	Recording	Workload	MTBF	Warranty	Amazon.com, October 26, 2026
WD Red Plus	4 TB	5400	128 MB	CMR	—	—	not stated	$194.99, $48.75 a TB
Seagate IronWolf	4 TB	5400	64 MB	CMR	—	1 million h	3 years + 3 of Rescue	$260.00, $65.00 a TB
Ultrastar DC HC310 (renewed)	4 TB	7200	256 MB + NVC	CMR	550 TB/yr	2 million h	not stated	no offer
HGST MegaScale DC (refurbished)	4 TB	5700	64 MB	not stated	—	800,000 h	not stated	no US listing
Seagate IronWolf	8 TB	7200	256 MB	CMR	—	1 million h	not stated	$499.99, $62.50 a TB
WD Red Plus	12 TB	7200	512 MB	CMR	180 TB/yr	—	3 years	$789.00, $65.75 a TB
Seagate IronWolf Pro	14 TB	not stated	256 MB	CMR	300 TB/yr	1.2 million h	5 years + 3 of Rescue	$631.00, $45.07 a TB

What the warranty covers, and what Rescue adds

The warranty replaces the drive; the Rescue service attempts to recover the data from it. Of the three 4 TB drives on this shelf with a US listing, this is the only one with a term written down.

The price

$260.00 on October 26, 2026, $65.00 a terabyte — $65.01 more than the 4 TB WD Red Plus, which prints more cache and no warranty term.

Prices quoted in this text were read on October 26, 2026. The live price is at the top of the page.

Where it holds up, and where it stops

Strengths

CMR, 5400 rpm and 64 MB of cache in the title, and up to 180 MB/s in the description
Three years of warranty with three years of Rescue data recovery
A 1 million hour MTBF and a stated ceiling of eight bays

Compromises

No workload rating in terabytes a year
$65.00 a terabyte on Amazon.com on October 26, 2026, against $48.75 for the 4 TB WD Red Plus
The second bullet mixes the range ceilings, 16 TB and 256 MB, with this drive's figures

Specifications

Capacity	4 TB — printed in the title. The second bullet also prints 16 TB, which is the ceiling of the IronWolf range and not this drive
Recording method	CMR — printed in the title
Stated workload rating	Not published on the listing as a figure in terabytes per year — the first bullet gives an enclosure ceiling of eight bays and several users, which is a deployment limit rather than an annual duty
Rotational speed	5400 rpm — printed in the title; the description gives speeds up to 180 MB/s
Cache size	64 MB — printed in the title. The second bullet's "up to 256MB" is the range ceiling
Interface	SATA at 6 Gb/s — printed in the title
Warranty length	Three years — stated in the fifth bullet as a limited product warranty, with three years of a data recovery service supplied alongside it. The two terms run to the same length and are named separately
Stated MTBF	1 million hours — stated in the fourth bullet, beside a drive health monitoring feature named by the maker. It is a population statistic in hours, and it is neither the warranty term above it nor a lifespan
Stated idle power	Not published on the listing — no figure in watts appears in the title or in the five bullets
Stated acoustic figure	Not published on the listing as a figure — the third bullet promises little to no noise and vibration, which is a claim without a decibel value behind it
Amazon reference	B09NHV3CK9
EAN	0763649173817
On Amazon.com	Amazon.com had an offer at $260 on October 26, 2026.

Where this unit differs

Put against the median of its own group on this site — not against every network product sold.

Cache size64 MB — printed in the title. The second bullet's "up to 256MB" is the range ceiling-75 % against the median of this group
Capacity4 TB — printed in the title. The second bullet also prints 16 TB, which is the ceiling of the IronWolf range and not this drive-50 % against the median of this group
Rotational speed5400 rpm — printed in the title; the description gives speeds up to 180 MB/s-25 % against the median of this group

The questions that come up before an order

What does the Rescue service add?

Three years of Seagate's data recovery service, stated alongside the three-year warranty. A warranty replaces a failed drive; a recovery service tries to get the data back from it.

Why is it dearer than the 4 TB WD Red Plus?

On October 26, 2026 it cost $260.00 against $194.99. What the extra buys on the page is a stated warranty, a recovery service and an MTBF, which the WD listing does not give; the WD has 128 MB of cache to this drive's 64 MB.

Our score

7.8/ 10

A plain, fully titled 4 TB NAS drive — CMR, 5400 rpm, 64 MB — with the warranty and recovery service written down. It costs $65.01 more than the 4 TB WD Red Plus on this date, and those written terms are what the difference buys.

Against the rest of the network and storage gear

This network and storage gear share the category and the price bracket. Only what each one states is shown; an incomplete column would mislead.

Model	Price	Capacity	Recording method	Stated workload rating	Rotational speed
Seagate IronWolf 4 TB (ST4000VN006)	$260	4 TB — printed in the title. The second bullet also prints 16 TB, which is the ceiling of the IronWolf range and not this drive	CMR — printed in the title	Not published on the listing as a figure in terabytes per year — the first bullet gives an enclosure ceiling of eight bays and several users, which is a deployment limit rather than an annual duty	5400 rpm — printed in the title; the description gives speeds up to 180 MB/s
Western Digital Red Plus 4 TB (WD40EFZZ), 5400 rpm	$195	4 TB — printed in the title, in the maker’s unit, and reported here in that unit without conversion	CMR — printed in the title	Not published on the listing — the third bullet names continuous operation and no annual figure in terabytes follows	5400 rpm — printed in the title
Seagate IronWolf 8 TB	$500	8 TB — printed in the title and in the second bullet, in the maker’s unit and reported here unchanged	CMR — printed in the title. Conventional recording writes tracks side by side and does not rewrite neighbors when data changes, which is what decides how an array rebuild behaves	Not published on the listing as a figure in terabytes a year — the first bullet gives an enclosure ceiling of up to eight bays and several users, which is a deployment limit rather than an annual duty. Three other drives on this shelf publish a rating	7200 rpm — printed in the title, as on the WD Red Plus 12 TB and the renewed Ultrastar; the 4 TB IronWolf and the 4 TB WD Red Plus here print 5400
Seagate IronWolf Pro 14 TB	$631	14 TB — printed in the title and in the second bullet, in the maker’s unit and reported here unchanged. It is the largest capacity on this shelf	CMR — printed in the title. Conventional recording writes tracks side by side rather than overlapping them, so changing data does not force neighboring tracks to be rewritten, which is what decides how a rebuild behaves in a large array	300 TB a year — stated in the description rather than in any bullet, alongside twenty-four-seven accessibility. It is the duty the drive is specified for and not a quota that runs down. A buyer reading only the bullets would not find it	Not published on the listing — no rpm figure appears in the title, the bullets or the description; the second bullet gives speeds up to 250 MB/s instead. The 8 TB IronWolf on this shelf prints 7200 rpm in its title

What separates the models, in network and storage gear

If price decides: Western Digital Red Plus 4 TB (WD40EFZZ), 5400 rpm, at $195.
Highest Capacity in the table: Seagate IronWolf Pro 14 TB (14 TB — printed in the title and in the second bullet, in the maker’s unit and reported here unchanged. It is the largest capacity on this shelf).

The buyer this one serves, among network and storage gear

A two- or four-bay home NAS where a stated warranty and a data recovery service matter more than the lowest price per terabyte.

What this one costs among network and storage gear

A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.

Details checked on October 26, 2026.

The network and storage gear guides it appears in

Best NAS Hard Drives for Continuous Running

What buyers actually choose

Amazon reports what buyers took in the month before this page was last checked: at least 2,000.

The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.

Sources

Specifications: the manufacturer sheet for network and storage gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

What we look at on this network and storage gear