DatacenterDisk

WD Ultrastar vs WD Ultrastar

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

+ Add driveShare comparison
Our Recommendation
👑
WD Ultrastar DC 20TB Renewed

WD Ultrastar DC 20TB Renewed wins on both price ($16.40/TB) and warranty (5 years).

Best $/TB: WD
Best Warranty: WD
Best for RAID: WD
Full Specification Comparison
Spec
WD
Ultrastar DC HC570 20TB SATA
$23.50/TB
WD
Ultrastar DC 20TB Renewed
$16.40/TB
Brand
WD
WD
Model
Ultrastar DC HC570 20TB SATA
Ultrastar DC 20TB Renewed
Series
Ultrastar DC
Ultrastar DC
Part Number
WUH722020BLE6L4
WUH722020BLE6L4
$/TB
$23.50
👑$16.40
Price
$469.99
$327.99
Condition
New
Refurb
Capacity
20TB
20TB
Interface
SATA-6G
SATA-6G
Form Factor
3.5"
3.5"
Drive Type
HDD
HDD
Recording Tech
ePMR
ePMR
RPM
7,200
7,200
Cache
512MB
512MB
Sector Size
512e
512e
Workload Rating
👑550TB/yr
👑550TB/yr
DWPD
N/A
N/A
Warranty
👑5 years
👑5 years
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 DC HC570 20TB SATA if:
  • ✓ Your server runs 24/7 under heavy sustained load
  • ✓ You need new-with-warranty for compliance or budgeting
  • ✓ You need high-density storage for bulk/archive workloads
Buy WD →
Choose WD Ultrastar DC 20TB Renewed if:
  • ✓ You need maximum storage per dollar
  • ✓ You need 5-year warranty coverage for production
  • ✓ You're building a RAID array and need guaranteed CMR compatibility
  • ✓ Your server runs 24/7 under heavy sustained load
Buy WD →

Frequently Asked Questions

WD Ultrastar offers better value at $16.40/TB vs $23.50/TB - a 30% 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. It uses CMR recording which is safe for all RAID levels. SATA interface is compatible with all NAS platforms including Synology, QNAP and TrueNAS.