DatacenterDisk

WD Ultrastar vs WD Ultrastar

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

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Our Recommendation
👑
WD Ultrastar DC SN655 15.36TB U.3

WD Ultrastar DC SN655 15.36TB U.3 wins on both price ($123.63/TB) and warranty (5 years).

Best $/TB: WD
Best Warranty: WD
Best for RAID: WD
Full Specification Comparison
Spec
WD
Ultrastar DC SN655 15.36TB U.3
$123.63/TB
WD
Ultrastar DC SN655 15.36TB U.3
$123.63/TB
Brand
WD
WD
Model
Ultrastar DC SN655 15.36TB U.3
Ultrastar DC SN655 15.36TB U.3
Series
Ultrastar DC SN655
Ultrastar DC SN655
Part Number
WUS5EA1A1ESP7E1
WUS5EA1A1ESP7E3
$/TB
👑$123.63
👑$123.63
Price
$1899.00
$1899.00
Condition
New
New
Capacity
15.36TB
15.36TB
Interface
NVMe-PCIe4
NVMe-PCIe4
Form Factor
U.3
U.3
Drive Type
SSD
SSD
Recording Tech
TLC
TLC
RPM
N/A (SSD)
N/A (SSD)
Cache
—
—
Sector Size
—
—
Workload Rating
—
—
DWPD
1 DWPD
1 DWPD
Warranty
👑5 years
👑5 years
Workload Tier
oltp
oltp
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 DC SN655 15.36TB U.3 if:
  • ✓ You need new-with-warranty for compliance or budgeting
Buy WD →
Choose WD Ultrastar DC SN655 15.36TB U.3 if:
  • ✓ You need maximum storage per dollar
  • ✓ You need 5-year warranty coverage for production
  • ✓ You need new-with-warranty for compliance or budgeting
Buy WD →

Frequently Asked Questions

WD Ultrastar offers better value at $123.63/TB vs $123.63/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.

Both drives carry 5-year warranties 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.