DatacenterDisk

WD Ultrastar vs WD MegaScale

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

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Our Recommendation
👑
WD Ultrastar 7K4000 4TB SATA NAS

WD Ultrastar 7K4000 4TB SATA NAS offers the best value at $47.50/TB. Available new with manufacturer warranty.

Best $/TB: WD
Best Warranty: WD
Best for RAID: WD
Full Specification Comparison
Spec
WD
Ultrastar 7K4000 4TB SATA NAS
$47.50/TB
WD
MegaScale DC 4000.B 4TB SATA Enterprise
$50.00/TB
Brand
WD
WD
Model
Ultrastar 7K4000 4TB SATA NAS
MegaScale DC 4000.B 4TB SATA Enterprise
Series
Ultrastar
MegaScale
Part Number
HMS5C4040ALE640
HMS5C4040ALE640
$/TB
👑$47.50
$50.00
Price
$190.00
$199.99
Condition
New
Refurb
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
—
—
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
WD
WD
NAS Storage
●●●
●●●
Backup Target
●●●
●●●
OLTP Database
●
●
Cold Archive
●
●
Virtualization
●
●
AI/ML Storage
●
●
Buying Recommendation
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 →
Choose WD MegaScale DC 4000.B 4TB SATA Enterprise if:
  • ✓ You're building a RAID array and need guaranteed CMR compatibility
  • ✓ You're comfortable with datacenter refurb to maximize savings
Buy WD →

Frequently Asked Questions

WD Ultrastar offers better value at $47.50/TB vs $50.00/TB - a 5% 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.

WD Ultrastar 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.