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Computer Weekly keeps its finger on the pulse in the world of data storage, with regular news, features and practical articles. This guide offers a comprehensive survey of the all-flash array market. We look at all-flash products from the big six storage vendors and the startups and specialists. Plus, we give the lowdown on all-flash vs hybrid flash arrays and all-flash vs server-side PCIe SSD. Finally, we look at the shortcomings of measuring the value of flash by metrics designed for spinning disk and suggest practical alternatives.