Side-by-side spec and price comparison. Live data from Amazon US.
MDD 6TB SAS 12G 7200RPM wins on both price ($13.33/TB) and warranty (5 years).
MDD 6TB offers better value at $13.33/TB vs $41.50/TB - a 68% 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.
MDD 6TB carries a longer 5-year warranty vs unknown years for HGST HUS726060AL5210. Both are enterprise-grade drives built for 24/7 operation.
HGST HUS726060AL5210 is the better fit for NAS storage. It uses CMR recording which is safe for all RAID levels. SAS interface requires a SAS HBA or SAS-capable NAS.