You mean just local disk C only or local disk C,D if so tell me how many gigs each?
What? Your topic is how to divide up a 320 gig drive. It doesn't make reference to a C or D drive. Anyhow, I don't partition any drive 500gigs or under. I just make one partition the entire size of the drive, in your case a single 320gig partition. If I got a 1Tb drive, I'd just make two 500gig partitions. Like I said, this is all personal preference. Some people like a smaller OS partition and a larger storage partition. Some like smaller partitions because it makes it faster to backup and restore since there is less data on smaller partitions. I don't like the hassles of trying to expand partitions later on, so I just make them larger from the get go.