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Brufh said:
Here is the Name "Disk Cleanup"
As in Microsoft Disk Cleanup?
No, no this tool does not massively rape your image files.

or to quote wikipedia, since I'm tired and half forgot the compression used -.-
Aside from removing unnecessary files, users also have the option of compressing files that have not been accessed over a set period of time. This option provides a systematic compression scheme. Infrequently accessed files are compressed to free up disk space while leaving the frequently used files uncompressed for faster read/write access times. If after file compression, a user wishes to access a compressed file, the access times may be increased and vary from system to system.
I suppose you could say kind of like zipping or rarring something. I suppose it could corrupt data but it does not unrecoverably rewrite it unless it did so in a corrupted way to begin with but that's not its purpose and not its general behaviour. You'd also not end up with working images anyway. That can only have been done by something that actually resaves your images.