April 17, 201412 yr I did for Windows. 30GB in Windows 7 and I had less than a GB left. I ran this: truncate -s+20G Windows7.img Booted back up and right click on Computer and select Manage. Then Disk Management. Right click your "(C:)" and select Extend and let it use the rest of the space you added. Mine was there right away, no need to even reboot.
April 17, 201412 yr My year old Win8 installation only freed up 324MB of space running that Windows Cleanup tool for Windows Update & Windows Upgrade log files. A fresh Win8.1 fully patched installation freed up 804MB. My two year old Win7 installation freed up 920MB in Service pack backup files and 3.05GB in Windows Update files.
April 17, 201412 yr I don't remember exactly, but I think I freed up more. I figured all this out as I was moving from Win7 to Win8 and virtualizing my old Win7. Don't remember exactly but Icleaned out close to 10G before virtualizing. I think I found alternate instructions to clean out the SP1 files that freed up more space.
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