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Seagate IronWolf vs Western Digital WD

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

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Our Recommendation
👑
Seagate IronWolf 4TB NAS ST4000VN006

Seagate IronWolf 4TB NAS ST4000VN006 balances price ($54.75/TB), warranty (3 years), and 180TB/yr workload rating for the best overall value.

Best $/TB: Western Digital
Best Warranty: Seagate
Best for RAID: Seagate
Full Specification Comparison
Spec
Seagate
IronWolf 4TB NAS ST4000VN006
$54.75/TB
Western Digital
WD Purple 4TB WD40PURX
$54.50/TB
Brand
Seagate
Western Digital
Model
IronWolf 4TB NAS ST4000VN006
WD Purple 4TB WD40PURX
Series
IronWolf
WD Purple
Part Number
ST4000VN006
WD40PURX
$/TB
$54.75
👑$54.50
Price
$219.00
$217.99
Condition
New
New
Capacity
4TB
4TB
Interface
SATA-6G
SATA-6G
Form Factor
3.5"
3.5"
Drive Type
HDD
HDD
Recording Tech
CMR
—
RPM
N/A (SSD)
N/A (SSD)
Cache
—
—
Sector Size
—
—
Workload Rating
180TB/yr
—
DWPD
N/A
N/A
Warranty
3 years
—
Workload Tier
nas
—
In Stock
✓ In Stock
✓ In Stock
Buy
Buy on Amazon →
Buy on Amazon →
Workload Fit
Workload
Seagate
Western Digital
NAS Storage
●●●
●●●
Backup Target
●●●
●●●
OLTP Database
●
●
Cold Archive
●
●
Virtualization
●
●
AI/ML Storage
●
●
Buying Recommendation
Choose Seagate IronWolf 4TB NAS ST4000VN006 if:
  • ✓ You need 3-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 Western Digital WD Purple 4TB WD40PURX if:
  • ✓ You need maximum storage per dollar
  • ✓ You need new-with-warranty for compliance or budgeting
Buy Western Digital →

Frequently Asked Questions

Western Digital WD offers better value at $54.50/TB vs $54.75/TB - a 0% 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 3-year warranty vs unknown years for Western Digital WD. 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.