I have simplified the figures below all are very approximate.
It seemed to copy free sectors about 50% quicker.
900GB (300GB full) took 9 hrs (approx 100GB per hour overall).
I should have resized the partition to 325GB, then moved the 325GB partition, then resized back to 900GB. That would have been many hours quicker as it would not have been moving 100's GB of nothing.
Edited by think26872 (Thu 07-Nov-13 16:57:22)