Wipe Free Space by Ccleaner

CCleaner for Windows
1

Today morning, I used a 3 pass option for 'Wipe Free Space' through C Cleaner software against an extra SATA disk (F:\). Once it was completed, I checked it with my EnCase forensics software, I created a snapshot of the ambient slack prior to the wipe and another following the wipe. The difference revealed that only 1/3 of the actual deleted data was un-reconstructable i.e. tough the all the deleted file names were visible but only 1/3rd could not be restored while the remaining 2/3rd of 'wiped' deleted files were fully recoverable and viewable within the EnCase gallery. I wonder if its worth paying for a software which doesn't complete the job entrusted it to do?

Any views on your experiences on this and if any other software is available that could finish the job well?

2

In future runs forget three passes, one will do. Shooting a horse three times doesn't make it three times deader.

Did you use WFS from Options/Settings or Drive Wiper?

Slack space does not contain deleted file data, it contains what was there in the unused space if the file didn't completely fill the last allocated cluster. A deleted file cannot be reconstructed from slack space, by definition.

CC WSF does not care about slack space anyway, or even files, as it operates at cluster level. There are some circumstances where WFS will leave some clusters untouched, and some small deleted files will remain unwiped, but I don't know if this applies in your case.