I'd strongly recommend you read VPC doc especially regarding installation of RH/Linux on a Mac HD. I know there's a tool for partitioning/initialising HD for Mac. But it's most likely too late to do that since all Mac are partitioned as one big HDs.
For PC, it doesn't matter which partition to use. Size should be 2.5GB+. It's vague. Everybody's install is slightly different.
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