The short answer
Most home lab buyers should start with WD Red Plus, Seagate IronWolf, Toshiba N300, or Synology Plus drives when those match the NAS compatibility list and current pricing. Do not mix random desktop drives just because they are cheap.
Capacity matters less than rebuild sanity. Two 12 TB drives with a tested backup are usually a better first storage decision than four bargain drives with no restore plan.
Recommended tiers
| Tier | Look for | Good fit | Watch out for |
|---|---|---|---|
| Budget | CMR NAS drive, 4-8 TB | Small media library, backup target, learning NAS | Lower capacity can fill faster than expected |
| Best value | CMR NAS drive, 10-16 TB | Media plus VM backups with room to grow | Check noise and warranty before buying several |
| Upgrade | NAS Pro or enterprise-class drives | Larger arrays, heavier writes, always-on storage | Often louder and overkill for a quiet closet lab |
What matters most
- CMR recording: Prefer CMR for NAS arrays and sustained writes.
- Compatibility: Check your NAS vendor compatibility list before buying.
- Noise: High-capacity and 7200 RPM drives can be very noticeable in a living space.
- Same capacity: Matching drive sizes keeps RAID and replacement decisions simpler.
- Backups: RAID helps availability. It does not replace a backup.
What I would buy first
For a two-bay NAS, I would buy two matched CMR NAS drives in the 8-16 TB range, mirror them, and use a separate USB disk or second machine for the backup. For a four-bay NAS, I would still start smaller unless the data already exists and needs a home.
Source checks
Western Digital identifies WD Red Plus as CMR; Seagate lists IronWolf NAS drives with CMR and AgileArray firmware; Toshiba lists N300 as 7200 RPM CMR NAS storage; Synology lists Plus Series HDDs as CMR with a 180 TB/year workload rating.
References: WD Red SMR/CMR information, Seagate IronWolf NAS drives, Toshiba N300, and Synology Plus Series HDD.