Side-by-side spec and price comparison. Live data from Amazon US.
Western Digital WD Purple 4TB WD40PURX offers the best value at $54.50/TB. Available new with manufacturer warranty.
Western Digital WD offers better value at $54.50/TB vs $55.50/TB - a 2% 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.
Western Digital WD is the better fit for NAS storage. SATA interface is compatible with all NAS platforms including Synology, QNAP and TrueNAS.