DatacenterDisk

Seagate IronWolf vs WD Ultrastar

Side-by-side spec and price comparison. Live data from Amazon US.

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Our Recommendation
👑
Seagate IronWolf Pro 12TB NAS ST12000NE0008

Seagate IronWolf Pro 12TB NAS ST12000NE0008 balances price ($44.58/TB), warranty (5 years), and 300TB/yr workload rating for the best overall value.

Best $/TB: WD
Best Warranty: Seagate
Best for RAID: Seagate
Full Specification Comparison
Spec
Seagate
IronWolf Pro 12TB NAS ST12000NE0008
$44.58/TB
WD
Ultrastar 12TB SATA HUH721212ALE604
$27.50/TB
Brand
Seagate
WD
Model
IronWolf Pro 12TB NAS ST12000NE0008
Ultrastar 12TB SATA HUH721212ALE604
Series
IronWolf Pro
Ultrastar HC520
Part Number
ST12000NE0008
HUH721212ALE604
$/TB
$44.58
👑$27.50
Price
$534.99
$329.99
Condition
New
Refurb
Capacity
12TB
12TB
Interface
SATA-6G
SATA-6G
Form Factor
3.5"
3.5"
Drive Type
HDD
HDD
Recording Tech
CMR
CMR
RPM
7,200
7,200
Cache
—
256MB
Sector Size
—
512e
Workload Rating
300TB/yr
—
DWPD
N/A
N/A
Warranty
5 years
—
Workload Tier
nas
nearline
In Stock
✓ In Stock
✓ In Stock
Buy
Buy on Amazon →
Buy on Amazon →
Workload Fit
Workload
Seagate
WD
NAS Storage
●●●
●●●
Backup Target
●●●
●●●
OLTP Database
●
●
Cold Archive
●●
●●
Virtualization
●
●
AI/ML Storage
●
●
Buying Recommendation
Choose Seagate IronWolf Pro 12TB NAS ST12000NE0008 if:
  • ✓ You need 5-year warranty coverage for production
  • ✓ You're building a RAID array and need guaranteed CMR compatibility
  • ✓ You need new-with-warranty for compliance or budgeting
Buy Seagate →
Choose WD Ultrastar 12TB SATA HUH721212ALE604 if:
  • ✓ You need maximum storage per dollar
  • ✓ You're comfortable with datacenter refurb to maximize savings
Buy WD →

Frequently Asked Questions

WD Ultrastar offers better value at $27.50/TB vs $44.58/TB - a 38% price difference. Factor in warranty length and workload rating when the price gap is small.

Mixing drives of different models in RAID is not recommended even if capacities match. Different firmware, error handling and seek patterns can cause rebuild issues. Use identical drives within the same RAID group for reliable operation.

Seagate IronWolf carries a longer 5-year warranty vs unknown years for WD Ultrastar. Longer warranty typically correlates with manufacturer confidence in reliability.

Seagate IronWolf is the better fit for NAS storage. It uses CMR recording which is safe for all RAID levels. SATA interface is compatible with all NAS platforms including Synology, QNAP and TrueNAS.