The downside is that overwriting files is significantly slower than just marking them as deleted, which is why operating systems don’t overwrite all deleted files in the first place. The files may still be recoverable if a copy of them existed elsewhere on the system and that copy wasn’t overwritten, so there’s no guarantee that the data will be completley unrecoverable if you overwrite it – nevertheless, if you’re worried about file-recovery utilities, this is a helpful feature. The overwrite option overwrites the files with useless data, preventing recovery. Programs normally delete files by marking them as deleted, leaving them on the disk for file-recovery utilities to potentially recover. This is equivalent to “shredding” files, as some programs refer to it. Instead of deleting files normally, you can go into BleachBit’s preferences window (Edit –> Preferences) and enable the Overwrite files to hide contents option. Verify that Bleachbit isn’t deleting any important files you want to keep. You should run a preview by clicking the Preview button before running an actual Clean operation.
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