Side-by-side spec and price comparison. Live data from Amazon US.
WD WD Purple 3TB WD30PURZ offers the best value at $70.00/TB. Available new with manufacturer warranty.
WD WD offers better value at $70.00/TB vs $73.33/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.
WD WD carries a longer 3-year warranty vs unknown years for HGST HUS724030ALA640. Both are enterprise-grade drives built for 24/7 operation.
HGST HUS724030ALA640 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.