Competely false. I've been multiboxing on 7200rpm 16mb cache hard drives for years. The biggest improvents in performance I had was when I upgraded from a q6600 to an i7.
Hard drives will absolutely not increase your frame rates or the number of clients you have. All they do is reduce the amount of time characters load in large areas, and your loading screens. Who cares about loading screens in WoW anyways? On my crappy 7200 rpm drives I don't believe any loading screen in WoW lasted longer than 5 seconds.
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