After defragmenting the hard disk of a old PC (Windows 7 Pro) with Defraggler about 120Gb of free disk space had been lossed. Restoring the systenm to a previous date didn't work.
How can get back the free disk space?
I have solved the problem by cleaning the disk with cleanmgr.exe.
Defraggler shouldn't have created any temporary files that the built in Windows Disk Cleanup (cleanmgr.exe) would then remove.
It is possible to get temporary files left behind if your computer crashed or was turned off during the defag.
But if that happens then you usually have to remove them manually yourself, Disk Cleanup doesn't know what they are to remove them..
Oh well, as long as Disk Cleanup removed whatever was taking the 120GB then you are good.
- Right. When "System Restore" is active then running Defragler (think: moving files around) will trigger Windows to make an additional System Restore Point. Hence the loss of free diskpsace.
You shouldn't see any difference as Windows has a maximum space already allocated for Restore Points, and if that's full then when creating a new one removes the oldest.
The 120GB reported by the poster seems way too much to be a Restore Point, Windows normally allocates about 10GB for all RPs.