Side-by-side spec and price comparison. Live data from Amazon US.
WD Easystore 4TB USB External balances price ($89.72/TB), warranty (2 years), and enterprise reliability for the best overall value.
WD WD_BLACK offers better value at $61.75/TB vs $89.72/TB - a 31% 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 Easystore carries a longer 2-year warranty vs unknown years for WD WD_BLACK. Longer warranty typically correlates with manufacturer confidence in reliability.
WD Easystore is the better fit for NAS storage. It uses CMR recording which is safe for all RAID levels.