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Western Digital WD vs Western Digital WD

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

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Our Recommendation
👑
Western Digital WD Purple 8TB WD84PURZ

Western Digital WD Purple 8TB WD84PURZ offers the best value at $53.49/TB. Available new with manufacturer warranty.

Best $/TB: Western Digital
Best Warranty: Western Digital
Best for RAID: Western Digital
Full Specification Comparison
Spec
Western Digital
WD Purple 8TB WD84PURZ
$53.49/TB
Western Digital
WD Purple 8TB WD81PURZ
$61.77/TB
Brand
Western Digital
Western Digital
Model
WD Purple 8TB WD84PURZ
WD Purple 8TB WD81PURZ
Series
WD Purple
WD Purple
Part Number
WD84PURZ
WD81PURZ
$/TB
👑$53.49
$61.77
Price
$427.95
$494.13
Condition
New
New
Capacity
8TB
8TB
Interface
SATA-6G
SATA-6G
Form Factor
3.5"
3.5"
Drive Type
HDD
HDD
Recording Tech
CMR
—
RPM
N/A (SSD)
5,400
Cache
128MB
256MB
Sector Size
—
—
Workload Rating
👑180TB/yr
👑180TB/yr
DWPD
N/A
N/A
Warranty
👑3 years
👑3 years
Workload Tier
—
—
In Stock
✓ In Stock
✓ In Stock
Buy
Buy on Amazon →
Buy on Amazon →
Workload Fit
Workload
Western Digital
Western Digital
NAS Storage
●●●
●●●
Backup Target
●●●
●●●
OLTP Database
●
●
Cold Archive
●●
●●
Virtualization
●
●
AI/ML Storage
●
●
Buying Recommendation
Choose Western Digital WD Purple 8TB WD84PURZ if:
  • ✓ You need maximum storage per dollar
  • ✓ You're building a RAID array and need guaranteed CMR compatibility
  • ✓ You need new-with-warranty for compliance or budgeting
Buy Western Digital →
Choose Western Digital WD Purple 8TB WD81PURZ if:
  • ✓ You need 3-year warranty coverage for production
  • ✓ You need new-with-warranty for compliance or budgeting
Buy Western Digital →

Frequently Asked Questions

Western Digital WD offers better value at $53.49/TB vs $61.77/TB - a 13% 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 3-year warranties and are built for enterprise operation. Check brand-specific AFR data and Backblaze drive stats for real-world failure rate comparisons.

Western Digital WD 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.