I restarted an almost completely finished defrag (97%) to get some diagnostics, and left it overnight, but was amazed to find that it didn't finish for over 12 hours!
The debug file is about 15 MB uncompressed, 1,1 MB zipped, and after the first 8/9 pages each line terminates with "Destination block is not free." I don't know if that has any significance...
Is there an address to which I can send the debug zip file, please, so that it can be looked at? Thanks!