Best Hard Drives for NAS (2026): IronWolf vs WD Red vs Exos vs N300

For a 2–4 bay NAS, buy the Seagate IronWolf 12TB (~$450, 4.5★/131): it is CMR, rated for 24/7 NAS duty, quiet enough for a living room, and the cheapest new desktop-class NAS drive per TB right now. If noise genuinely doesn’t matter and you are okay with a renewed enterprise drive, the Seagate Exos X24 24TB wins on raw $/TB, though it sounds like a datacenter because it comes from one.

Quick comparison

Drive	Amazon price (Oct 23)	$/TB	RPM	Workload	Warranty	Rating	Buy it if
Seagate Exos X24 24TB (renewed)	$798.99	$33.29	7200	550TB/yr	Seller (5 yr new)	4.3★ (29)	You want max TB per bay and the NAS sits somewhere you can’t hear it.
Seagate IronWolf 12TB	$449.99	$37.50	7200	180TB/yr	3 yr + Rescue	4.5★ (131)	You want the default 12TB NAS drive. Most people should buy this.
WD Red Plus 12TB	$509.99	$42.50	7200	180TB/yr	3 yr	3.9★ (404)	You prefer WD firmware/support over Seagate.
Seagate IronWolf Pro 20TB	$879.99	$44.00	7200	300TB/yr	5 yr + Rescue	3.9★ (337)	You want new 20TB bays with a 5-year warranty and rescue plan.
WD Red Pro 20TB	$902.33	$45.10	7200	300TB/yr	5 yr	3.9★ (23)	You want WD’s 20TB flagship for heavy write workloads.
Toshiba N300 12TB	$689.88	$57.50	7200	180TB/yr	3 yr	4.4★ (64)	Only when it’s priced near the IronWolf. Right now it isn’t.

CMR vs SMR: the one spec that actually matters

Two 3.5-inch drives can look identical on the label and behave completely differently in a NAS. The difference is how tracks are written:

• CMR (conventional magnetic recording): tracks are laid side by side. Writing data only touches the track being written. Random writes (which RAID parity updates and ZFS copy-on-write generate constantly) run at full speed.
• SMR (shingled magnetic recording): tracks overlap like roof shingles to squeeze more capacity onto the same platters. Rewriting one track means rewriting its neighbors, so the drive has to pause and restructure data. Sustained write speeds collapse to single-digit MB/s.

That collapse is exactly what happens during a RAID rebuild or ZFS resilver. People on TrueNAS and Synology forums have documented SMR drives taking weeks to resilver, dropping out of the array mid-rebuild, or getting kicked by the controller for unresponsiveness, at which point a second drive failure becomes a dead pool. SMR drives also pay this penalty forever, not just during rebuilds: every heavy write session on a busy Plex or backup box stalls.

WD got caught quietly shipping SMR in the Red line in 2020 and had to rename the product line in response. That’s why Red Plus and Red Pro are guaranteed CMR while plain Red is not. Seagate kept IronWolf and Exos CMR throughout. Toshiba’s N300 is CMR as well.

Rule of thumb: if a listing doesn’t explicitly say CMR, assume SMR and skip it for NAS use.

The picks

1. Seagate IronWolf 12TB: the default buy

$449.99 · 4.5★ from 131 ratings (13,000+ across the full IronWolf listing family)

The IronWolf 12TB (ST12000VN0008) hits the sweet spot this year: 7200rpm, CMR, rotational vibration sensors for multi-bay boxes, a 180TB/year workload rating, and a 3-year warranty with Seagate’s 3-year Rescue data recovery plan on top. At ~$37.50/TB it undercuts every other new desktop NAS drive in the lineup while staying quiet enough to live under a TV.

One listing quirk: this ASIN sometimes shows a Dutch title (“Interne Harde Schijf”) on amazon.com, though it’s the same ST12000VN0008 sold through the US store. Check that it ships from Amazon before buying, like you would on any bare drive.

2. Seagate Exos X24 24TB: best $/TB, bring earplugs

$798.99 (renewed listing) · 4.3★ from 29 ratings

The Exos X24 is an enterprise helium drive: 24TB per bay, 550TB/year workload rating, 2.5M-hour MTBF, and the lowest $/TB of anything on this page at $33.29. Note that this specific $798.99 Amazon listing (B0DNNKNKS4, sold by goHardDrive and fulfilled by Amazon) is a renewed/recertified unit, so your warranty comes from the seller rather than Seagate’s 5-year retail coverage. In a rack in the garage, it is the obvious capacity king.

The catch is acoustic. Exos drives are built for rows of servers, not living rooms: idle hum plus loud seek chatter that users describe as “marbles in a tin can.” In a 4-bay box two meters from your couch, four of these are genuinely unpleasant. It’s also a 7200rpm enterprise drive, so expect ~8–10W per drive at idle; a 4-disk Exos array can add 30W+ to your power bill 24/7.

3. WD Red Plus 12TB: the WD alternative

$509.99 · 3.9★ from 404 ratings

The WD Red Plus 12TB (WD120EFGX) is WD’s answer to the IronWolf: 7200rpm, CMR, 180TB/year, 3-year warranty. Specs are nearly identical. Pick it if you’ve had better luck with WD, or when a sale puts it below the IronWolf. At its current ~$60 premium per drive there’s no technical reason to pay more for it.

Worth noting: the 3.9★ rating is dragged down by dead-on-arrival and shipping complaints that hit every mechanical drive on Amazon, not by a model-specific flaw. Buy from a listing shipped by Amazon so returns are painless if a drive arrives DOA.

4. Seagate IronWolf Pro 20TB: big bays, 5-year warranty

$879.99 · 3.9★ from 337 ratings

When 12TB bays aren’t enough and you want a brand-new drive with full factory coverage, the IronWolf Pro 20TB gives you 20TB with the Pro-tier extras: 300TB/year workload rating, 5-year warranty (vs 3 on non-Pro), and the same 3-year Rescue plan. At $44/TB you’re paying a premium for capacity density and warranty, which pays off when your NAS only has four bays and your library keeps growing.

This is the drive I’d put in a UGREEN DXP4800 Plus or similar 4-bay where every bay slot is precious: 4×20TB gets you 80TB raw (60TB usable in RAID 5) versus 48TB raw on 12TB disks.

Check IronWolf Pro 20TB price

5. WD Red Pro 20TB: WD’s heavy-duty flagship

$902.33 · 3.9★ from 23 ratings

The WD Red Pro 20TB matches the IronWolf Pro spec for spec: 7200rpm, CMR, 300TB/year, 5-year warranty. It costs ~$22 more at current pricing and lacks Seagate’s bundled Rescue plan, so on paper it’s the weaker buy. If you’re already running WD Reds and want to keep one vendor in the pool (or find it on sale), it’s a solid 20TB disk.

Check WD Red Pro 20TB price

6. Toshiba N300 12TB: fine drive, wrong price

$689.88 · 4.4★ from 64 ratings

The Toshiba N300 is a legitimately good NAS drive (CMR, 7200rpm, 180TB/year, 3-year warranty) that simply costs 53% more per TB than the IronWolf right now. Historically it swings between “cheapest option” and “why bother” depending on stock. If you find it under ~$450, it’s worth considering; at $689 it isn’t.

Check Toshiba N300 price

How many drives do you actually need?

RAID levels trade capacity for redundancy, and the math changes what you should buy:

Drives	RAID level	Usable (12TB disks)	Survives
2	Mirror / RAID 1	12TB	1 disk
3	RAID 5 / RAIDZ1	24TB	1 disk
4	RAID 5 / RAIDZ1	36TB	1 disk
4	RAID 6 / RAIDZ2	24TB	2 disks
4	RAID 10	24TB	1–2 disks

Two honest opinions here:

• RAID 5 with large drives is a real risk. A 20TB rebuild takes a day or more and hammers the surviving disks the whole time. With 16TB+ drives, use RAID 6/RAIDZ2 (or mirrors); the second parity disk is cheap insurance compared to a double failure mid-resilver.
• RAID is not backup. It protects against disk death, not ransomware, fat fingers, or the house burning down. Keep a copy off the array; even a USB DAS doing nightly syncs counts.

For Plex libraries specifically, a big single-volume pool of media you can re-rip is a different risk profile than family photos. I run RAIDZ2 on irreplaceable data and a plain large pool for media. The NAS for Plex guide covers the enclosure side.

Buying tips that save real money

• Buy from different batches. Drives from the same manufacturing batch share failure patterns. If you’re buying 3–4 disks, split the order across two listings, brands, or a couple of weeks of purchases. It’s cheap diversity.
• Run a burn-in test before trusting the pool. badblocks -wsv or a full SMART extended test over the first week catches most infant mortality. Better a DOA return than a rebuild.
• Be honest about recertified drives. Factory-recertified Exos and IronWolf drives sell for 20–30% less (including the $798.99 Exos X24 listing above, or direct from ServerPartDeals and goHardDrive), usually with shorter seller warranties (1–3 years) and no Seagate Rescue plan. They’re a reasonable gamble for redundant media pools, and a bad idea for your only copy of family photos. Always check the warranty length and seller on the listing itself.
• Shucking is mostly dead. For years the cheapest NAS drives were WD Elements/My Book externals containing white-label CMR helium drives. Prices on externals have risen and internal stock has improved, so this barely pays in 2026, and you lose the warranty the moment the case comes off. Only worth it if you find a clearance deal.
• Match drive count to bays, not just capacity. Four 12TB drives in RAIDZ2 give 24TB usable. Two 24TB Exos mirrored give the same, but leave two empty bays for later expansion (or pair with a DAS down the road). Plan for the NAS you’ll have in three years.

Noise and power: the spec sheet doesn’t tell you

Drive	Approx. idle acoustics	Idle power	Living-room friendly?
IronWolf 12TB	~28 dBA	~5W	Yes, barely audible
WD Red Plus 12TB	~25–28 dBA	~5W	Yes
IronWolf Pro 20TB	~32 dBA	~5.5W	Borderline
WD Red Pro 20TB	~32 dBA	~6W	Borderline
Exos X24 24TB	~34 dBA idle + loud seeks	~8–10W	No
Toshiba N300 12TB	~30 dBA	~5W	Borderline

If the NAS lives next to your desk or TV, that table is your buying decision: IronWolf or Red Plus. If it lives in a closet, garage, or rack (especially if you’re building a homelab box that also runs Docker and Proxmox), the Exos capacity math is hard to argue with.

What I’d buy

• 2–4 bay NAS in the house: IronWolf 12TB, as many as you need, in RAID 5/6-equivalent.
• Rack or garage, max capacity: Exos X24 24TB, mirrored or RAIDZ2.
• New 20TB bays with 5-year warranty: IronWolf Pro 20TB.
• WD loyalist / IronWolf on backorder: WD Red Plus 12TB.
• Never: any drive that doesn’t say CMR on the datasheet, and plain WD Red (non-Plus) at any price for RAID use.

FAQ

Is IronWolf or WD Red better for a NAS?

They’re equivalent at the same tier: IronWolf competes with Red Plus, IronWolf Pro with Red Pro. Both are 7200rpm, CMR, and rated for 180TB/year (standard) or 300TB/year (Pro). In late 2026 the IronWolf simply costs less per TB, which is why it’s the default pick. Buy whichever is cheaper per TB on the day you order.

Can I use Exos datacenter drives in a home NAS?

Yes. They’re standard SATA drives and work fine in UGREEN, QNAP, TerraMaster, and TrueNAS builds. One exception to check: Synology’s 2025/2026 x25+ series (like the DS925+) enforces a verified drive compatibility list that flags or blocks unverified third-party drives (see our UGREEN vs Synology guide). Beyond compatibility lists, the trade-offs with Exos are acoustic (loud seeks) and power (roughly double the idle watts of a desktop NAS drive). Put them in a rack or a room you don’t sit in and they’re the best $/TB in this lineup.

Why is SMR bad for RAID and ZFS?

SMR drives rewrite whole shingled track groups for a small change, so sustained writes collapse. During a RAID rebuild or ZFS resilver (a multi-hour sustained write), SMR disks can stall for so long the controller marks them dead, and a second disk failing mid-rebuild kills the pool. CMR has no such penalty. Never put SMR in a redundant array.

Should all drives in my NAS be the same model?

Same capacity, ideally. Mixed capacities work (especially in Synology SHR or MergerFS) but standard RAID uses the smallest disk in the pool. Same model isn’t required, and buying from different batches or even brands slightly reduces correlated-failure risk. Don’t mix CMR and SMR drives in a pool, and don’t mix dramatically different speeds.

Are recertified or renewed NAS drives worth it?

Sometimes. Factory-recertified and Amazon Renewed enterprise drives (like the $798.99 Exos X24 listing above) save 20–30% but carry shorter seller warranties, typically 1–3 years instead of Seagate’s 5-year retail coverage, and no Rescue data-recovery plan. They’re defensible for redundant media libraries you can re-create; skip them for the pool holding things you can’t.

How much usable space do I get from 4× 12TB in RAID?

RAID 5 / RAIDZ1: ~36TB usable (one disk of parity). RAID 6 / RAIDZ2: ~24TB usable (two disks of parity). RAID 10: ~24TB usable. With 12TB+ drives I recommend RAID 6/RAIDZ2 for irreplaceable data because rebuild times are long enough that a second failure during resilver is a real possibility, not a hypothetical.