DatacenterDisk

Seagate ST4000NM0033 vs WD Ultrastar

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

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Our Recommendation
👑
Seagate ST4000NM0033 4TB SATA Enterprise

Seagate ST4000NM0033 4TB SATA Enterprise offers the best value at $28.50/TB. Available new with manufacturer warranty.

Best $/TB: Seagate
Best Warranty: WD
Best for RAID: Seagate
Full Specification Comparison
Spec
Seagate
ST4000NM0033 4TB SATA Enterprise
$28.50/TB
WD
Ultrastar 7K4000 4TB SATA NAS
$36.25/TB
Brand
Seagate
WD
Model
ST4000NM0033 4TB SATA Enterprise
Ultrastar 7K4000 4TB SATA NAS
Series
Constellation
Ultrastar
Part Number
ST4000NM0033
HMS5C4040ALE640
$/TB
👑$28.50
$36.25
Price
$114.00
$145.00
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
7,200
7,200
Cache
—
—
Sector Size
512n
512n
Workload Rating
550TB/yr
—
DWPD
N/A
N/A
Warranty
—
—
Workload Tier
nearline
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 ST4000NM0033 4TB SATA Enterprise if:
  • ✓ You need maximum storage per dollar
  • ✓ You're building a RAID array and need guaranteed CMR compatibility
  • ✓ Your server runs 24/7 under heavy sustained load
  • ✓ You need new-with-warranty for compliance or budgeting
Buy Seagate →
Choose WD Ultrastar 7K4000 4TB SATA NAS if:
  • ✓ You need new-with-warranty for compliance or budgeting
Buy WD →

Frequently Asked Questions

Seagate ST4000NM0033 offers better value at $28.50/TB vs $36.25/TB - a 21% 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.

Both drives carry similar warranty terms and are built for enterprise operation. Check brand-specific AFR data and Backblaze drive stats for real-world failure rate comparisons.

Seagate ST4000NM0033 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.