Hide XP partition to install Vista?

I'd like to dual boot between XP & Vista but I'm not sure if I need to hide
partitions or not.

XP is on a Primary partition and I will create another Primary partition for
Vista (on the same disk). Do I need to make the Vista partition active and
hide the XP partition before the install? I don't want Vista seeing the XP
partition and vice versa.

Does the Vista boot manager hide other primary partitions whilst active?

Thanks

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