Western Digital Hard Disks - Which to buy? WD Blue, Black, Purple, Red, Gold and Ultrastar.

In depth specs and price comparison for Western Digital drives, including WD Blue vs WD Black, WD Purple, WD Red, WD Gold and the Ultrastar. What is the difference, and should you just buy the one that is targeted at your use case?

I compare price per Terabyte across all capacities in the ranges and see what you get for you money in both the US and the UK.

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