DatacenterDisk

Seagate SkyHawk vs WD Ultrastar

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

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Our Recommendation
👑
Seagate SkyHawk 4TB ST4000VX007

Seagate SkyHawk 4TB ST4000VX007 balances price ($52.50/TB), warranty (3 years), and 180TB/yr workload rating for the best overall value.

Best $/TB: WD
Best Warranty: Seagate
Best for RAID: Seagate
Full Specification Comparison
Spec
Seagate
SkyHawk 4TB ST4000VX007
$52.50/TB
WD
Ultrastar 7K4000 4TB SATA NAS
$47.50/TB
Brand
Seagate
WD
Model
SkyHawk 4TB ST4000VX007
Ultrastar 7K4000 4TB SATA NAS
Series
SkyHawk
Ultrastar
Part Number
ST4000VX007
HMS5C4040ALE640
$/TB
$52.50
👑$47.50
Price
$209.99
$190.00
Condition
New
New
Capacity
4TB
4TB
Interface
SATA-6G
SATA-6G
Form Factor
3.5"
3.5"
Drive Type
HDD
HDD
Recording Tech
CMR
CMR
RPM
N/A (SSD)
7,200
Cache
64MB
—
Sector Size
—
512n
Workload Rating
180TB/yr
—
DWPD
N/A
N/A
Warranty
3 years
—
Workload Tier
—
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 SkyHawk 4TB ST4000VX007 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 WD Ultrastar 7K4000 4TB SATA NAS if:
  • ✓ You need maximum storage per dollar
  • ✓ You need new-with-warranty for compliance or budgeting
Buy WD →

Frequently Asked Questions

WD Ultrastar offers better value at $47.50/TB vs $52.50/TB - a 10% 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 SkyHawk carries a longer 3-year warranty vs unknown years for WD Ultrastar. Longer warranty typically correlates with manufacturer confidence in reliability.

Seagate SkyHawk 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.