I'm about to do a HD upgrade and was wondering 1 thing. I think I read in the FAQ that the speed of the HD is not really an issue. Is this true? So paying more for a 5400 is a waste of money? 4200 will be plenty? Just want my empeg to perform the best it can

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40GB Mk2 [blue]blue[/blue] 90000660 Driveless Mk2a [blue]blue[/blue] 120001040