You just install as per usual, and select which HDD you want to use as the C: (System) disk when it asks where you want to install to... You should be able to see which disk is which as the bigger disk will obviously have a bigger number (surprise surprise!) next to it....
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I've seen the light... It was green, flashy and attached to a Network Interface Card...
Whenever someone says "You can't miss it" I invariably do...