After upgrade of Win8.1 to Win10, there was a 15.5 GB Windows.old file. Disk Cleanup was run to remove the Windows.old file that should increase disk free space by 15.5GB, but disk free space was increased by only 12.5GB. This same results was resulted on a second PC on which the same upgrade was done. Why this difference, and where did the 3GB discrepancy go?
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