Fast NAS drive

Seagate IronWolf Pro 4TB

Busier NAS boxes and bigger arrays that want speed and a data recovery plan.

Our pick: Fast NAS drive. The Seagate IronWolf Pro 4TB is a CMR NAS hard drive (7,200 RPM, 4TB listing we checked). It suits busier NAS boxes and bigger arrays that want speed and a data recovery plan. The catch: louder than WD Red Plus (51 negative mentions of noise). The bigger IronWolf and IronWolf Pro listings (8TB, 16TB to 32TB) failed our reliability check, so we only list this one.

about $290Amazon shows today's exact price.

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Type: NAS hard drive
Recording: CMR
Speed: 7,200 RPM
Sizes: 4TB listing we checked

Specs are from the Amazon listing or the maker. Prices are for the box without drives unless the listing says otherwise.

Why we pick it

7,200 RPM, up to 214MB/s, IronWolf Health Management
Includes Rescue data recovery
4.5 stars from 2,705 ratings on the 4TB

The catch

Louder than WD Red Plus (51 negative mentions of noise). The bigger IronWolf and IronWolf Pro listings (8TB, 16TB to 32TB) failed our reliability check, so we only list this one.

NAS drives in one line

NAS drives are built for 24/7 running and RAID: CMR recording, vibration sensors and longer warranties. Desktop SMR drives can stall a RAID rebuild.

How many bays do you need? · RAID is not backup

Questions about the Seagate IronWolf Pro 4TB

Is the Seagate IronWolf Pro 4TB good for a NAS?

Fast NAS drive. 7,200 RPM, up to 214MB/s, IronWolf Health Management. Includes Rescue data recovery. 4.5 stars from 2,705 ratings on the 4TB. The catch: Louder than WD Red Plus (51 negative mentions of noise). The bigger IronWolf and IronWolf Pro listings (8TB, 16TB to 32TB) failed our reliability check, so we only list this one.

Is the Seagate IronWolf Pro 4TB CMR or SMR?

CMR. Avoid SMR drives in a NAS: they can slow RAID rebuilds to a crawl.

How many drives should I buy?

Two for a 2-bay mirror (RAID 1). For four or more bays, RAID 5 or Synology SHR uses one drive’s worth of space for protection. Buy drives of the same size, and keep a separate backup: RAID is not a backup.

What Seagate says about it

IronWolf internal hard drives are the ideal solution for up to 24-bay, multi-user NAS server environments that demand powerhouse performance
Store more and work faster with a NAS hard drive that provides 4TB and speeds up to 214MB/s
Specifically built for less wear and tear, little to no noise/vibration, no lags or down time, increased file-sharing performance, lower power consumption, and extra data protection—even in the event of power loss
Easily monitor NAS drive health using the integrated IronWolf Health Management system, and enjoy long-term reliability with 1. 2M hours MTBF
Five-year limited product warranty protection plan and three year Rescue Data Recovery Services included
The available storage capacity may vary.

From the Amazon listing, in the maker's own words.