2.5% is suspiciously the difference between 1000 and 1024. Windows counts in binary MB and GB. How did you convert your Excel total in MB into GB?
Peter
That's it, I think. I added up all those megabytes that Windows said each folder contained, and figured that 28,175 megabytes must be 28.2 gigabytes.
I knew better than that... I just had it in my head that since Windows was providing me with all the number that they would add up, which they do, of course. What caught me out was not thinking through the implications of Windows displaying the grand total in gigabytes but the subtotals in megabytes.
Doh!
tanstaafl.