D. Sort of a mixture. While I have one main 60 gig runtime, I use P Booost, so I have many custom folders created over the years to help separate things into more manageable sizes. Also in the process of creating specific separate runtimes, so there will be ways to access content if the main system ceases to function. It would be lovely to go to the multiple runtime scheme, but that would entail unsnarling the main runtime to save the content no longer available.