Skip to content
Seagate CMR 3.5in

Seagate IronWolf 4TB

4TB

Model ST4000VN006

rpm
5,400
MB cache
256
TB/yr
180
yr warranty
3

IronWolf range, also in 8 TB, 12 TB

Who the IronWolf 4 TB is for

It's a good match for a 2- or 4-bay box that sits somewhere you can hear it. Drives at 5,400 rpm run quieter and cooler than the 7,200 rpm lot, and they're still quick enough for gigabit. CMR, thankfully. SMR and parity rebuilds don't get on.

Watch out for

If there's any chance you'll move to a bigger box later, a pro line saves buying drives twice. The trade-off is three years' warranty and a 180 TB a year workload rating, which is fine for a media library that mostly sits there and tight if you shift terabytes around every week (scrubs and rebuilds count towards it too).

No Backblaze failure rate for this one, as they don't run it in big enough numbers. A 4-bay box full of these gives 12 TB after one drive's worth of parity.

Specifications

Each value links to the Seagate page or datasheet it came from, and "Not published" means the maker doesn't list it there.

Seagate IronWolf 4TB specifications
Capacity 4 TB source for Capacity (seagate.com, opens in new tab)
Spindle speed 5,400 rpm source for Spindle speed (seagate.com, opens in new tab)
Recording technology CMR source for Recording technology (seagate.com, opens in new tab)
Cache 256 MB source for Cache (seagate.com, opens in new tab)
Interface SATA 6Gb/s source for Interface (seagate.com, opens in new tab)
Form factor 3.5in source for Form factor (seagate.com, opens in new tab)
Workload rating 180 TB/yr source for Workload rating (seagate.com, opens in new tab)
MTBF / MTTF 1,000,000 hours source for MTBF / MTTF (seagate.com, opens in new tab)
Rated for NAS bays (max) 8 bays source for Rated for NAS bays (max) (seagate.com, opens in new tab)
Warranty 3 years source for Warranty (seagate.com, opens in new tab)

Sources: seagate.com

Failure rate

There's no Backblaze figure for this one. We only publish a rate with at least 60 drives and 50 drive-years behind it, because below that the error bars are too wide to tell you anything. The reliability page has every model that clears the bar.