
Seagate IronWolf Pro 4TB
Busier NAS boxes and bigger arrays that want speed and a data recovery plan.

Most home NAS boxes: quiet, cool and CMR.
Our pick: Quiet NAS drive. The WD Red Plus is a CMR NAS hard drive (5,400 RPM (small sizes), 7,200 (large), 2TB to 12TB). It suits most home NAS boxes: quiet, cool and CMR. The catch: some buyers hit compatibility warnings (36 negative mentions), usually Synology flagging non-Synology drives. Check your NAS’s list.
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Specs are from the Amazon listing or the maker. Prices are for the box without drives unless the listing says otherwise.
Some buyers hit compatibility warnings (36 negative mentions), usually Synology flagging non-Synology drives. Check your NAS’s list.
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.
Quiet NAS drive. CMR recording, built for 24/7 NAS use in up to 8 bays. 4.2 stars from 3,760 ratings. The catch: Some buyers hit compatibility warnings (36 negative mentions), usually Synology flagging non-Synology drives. Check your NAS’s list.
CMR. Avoid SMR drives in a NAS: they can slow RAID rebuilds to a crawl.
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.
From the Amazon listing, in the maker's own words.

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

Filling a NAS with big drives for less per terabyte.

One person backing up a phone and a laptop on a small budget.