You get some data throughput increases by increasing areal density and number of platters -- the days of counting on 100-120MB/s from a spinner are now replaced

You get some data throughput increases by increasing areal density and number of platters -- the days of counting on 100-120MB/s from a spinner are now replaced by checking to see whether you get 220-280MB/s -- but you should not expect the rotating disk technology to push the SATA III standard just yet. It will be more than 13 hours.