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 6TB SATA NAS

Seagate IronWolf 6TB SATA NAS offers the best value at $28.33/TB. Available new with manufacturer warranty.

Best $/TB: Seagate
Best Warranty: Seagate
Best for RAID: Seagate
Full Specification Comparison
Spec
Seagate
IronWolf 6TB SATA NAS
$28.33/TB
WD
Ultrastar 6TB SATA
$30.00/TB
Brand
Seagate
WD
Model
IronWolf 6TB SATA NAS
Ultrastar 6TB SATA
Series
IronWolf
Ultrastar HC310
Part Number
ST6000VN001
—
$/TB
👑$28.33
$30.00
Price
$169.99
$179.99
Condition
New
Refurb
Capacity
6TB
6TB
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
128MB
256MB
Sector Size
512e
—
Workload Rating
180TB/yr
—
DWPD
N/A
N/A
Warranty
3 years
—
Workload Tier
nearline
nearline
In Stock
Check
✓ In Stock
Buy
Buy on Amazon →
Buy on Amazon →
Workload Fit
Workload
Seagate
WD
NAS Storage
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Backup Target
●●●
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OLTP Database
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Cold Archive
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Virtualization
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AI/ML Storage
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Buying Recommendation
Choose Seagate IronWolf 6TB SATA NAS if:
  • ✓ You need maximum storage per dollar
  • ✓ 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 WD Ultrastar 6TB SATA if:
  • ✓ You're comfortable with datacenter refurb to maximize savings
Buy WD →

Frequently Asked Questions

Seagate IronWolf offers better value at $28.33/TB vs $30.00/TB - a 6% 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 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.