Can anyone experience difference in file and folder size on a large mixed folder?

Ok thanks for the hint. Now I remember where I have seen those settings and I can get what caused you to think about those settings in the way of a troubleshooting expert. But as I told it is something breaking the operation of calculation and as there isn't any hint of the same causes confusion at that point of copying a folder. As the size difference whenever I saw wasn't small ( for example in the above instance 6 gb vs 10 gb ), it can't be due to allocation unit size. As I have told and as I always keep such folders for work somewhere and as my system is a little bit slow i will see that again later and I think it will be better to discuss at that time more about displaying a wrong paused calculation st front end. ( Surely about its effect on an ordinary user ). The best answer remains your first even though my attachments show the big difference in size because it caused me to check the size of the newly created folder on my system which actually resides in another drive on the same disk, which I found showing exact sizes on the same experiment when system was booted fresh without starting any of the other big tasks ). Thanks again and I will surely note somewhere about your quick response rate with full of insights.