Success for the first time! On MacBook Pro: 40gb initial XP HDD to 20gb final in 3 hours and 23 minutes. Activity montitor did indicate 100% CPU usage much of the time, but that would be expected, I suppose.
Same success with 5120. Took 30 minutes to compress 8.5 Gb image. 5120 is much smoother in operation.
Same success with 5120. Took 30 minutes to compress 8.5 Gb image. 5120 is much smoother in operation!!!