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Wipe Free Space


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#1 OFFLINE Conor O'Donoghue

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Posted 09 August 2013 - 11:10 AM

On the "Changing CCleaner settings" page the following is stated near the end of the page:

"Note: CCleaner can only securely delete files which have not yet been deleted from the Recycle Bin"


That makes the "Wipe Free Space" option in Cleaner and the "Wipe Drive" option in Tools very misleading. Disk "free space" is commonly understood to be those blocks which have no entries in the File Allocation Table (FAT). In fact strictly speaking "free space" does not include the space taken by files in the Recycle bin as they do have blocks allocated to them albeit not in the usual way.

Most users who want to wipe free space are not concerned about the files in the Recycle Bin which they know can easily be recovered - they are concerned about files and file fragments that are still on the disk but which the system considers deleted. There are plenty of tools available to recover (in some cases partially) these files. So there is little point in "wiping free space" using the Guzman method (35 passes) if these files are still recoverable.

I strongly recommend one of the following options in order of preference:

1. Implement full wipe free space functionality
2. Rename these options e.g. "Wipe Free Space" --> "Wipe Recycle Bin"
3. Ensure that users are warned of the limitation of these options via a pop notice at the time of execution which clearly and explicity states that only files in the Recycle Bin will be securely deleted.

I am also quite surprised by how long it takes to "wipe" the Recycle Bin even when it is almost empty - it took over 20 mins to wipe a 1 kB file !!!

If I have misunderstood the funcitonality of the "Wipe Free Space" and "Wipe Drive" options please correct me.

#2 OFFLINE kroozer

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Posted 09 August 2013 - 11:40 AM

. . . it took over 20 mins to wipe a 1 kB file


Wiping a 1 kB file with 1-pass takes maybe 1 sec for me, so I suggest you reset the Recycle Bin to ensure integrity.

This procedure works for Win7 and Vista.

#3 OFFLINE Augeas

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Posted 10 August 2013 - 04:25 AM

On the "Changing CCleaner settings" page the following is stated near the end of the page:

"Note: CCleaner can only securely delete files which have not yet been deleted from the Recycle Bin"

That makes the "Wipe Free Space" option in Cleaner and the "Wipe Drive" option in Tools very misleading.


Not really. Secure File Deletion and Wipe Free Space are separate and different functions.

Wipe Free space will overwrite any unallocated clusters on a partition. (There may be some that are inaccessible, but don't ask me for the rules). The recycle bin is not unallocated clusters. If a cluster is overwritten once (forget multiple overwrites) then the overwritten data can never be recovered. If data is overwritten and then can be 'seen' afterwards, either you're looking at another source or it wasn't overwritten in the first place. There's no such thing as multiple overwrites being 'better' or harder to recover.

Wipe Recycle Bin is already catered for. Check Empty Recycle Bin in Cleaner and use secure file deletion. It isn't part of, and doesn't belong in, Free Space Wipe.

#4 OFFLINE rtschaen

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Posted 25 September 2013 - 09:40 AM

I am clearing a used computer before giving it to a friend. Is the Wipe Free Space in the free d/l version of ccleaner?

#5 OFFLINE kroozer

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Posted 25 September 2013 - 09:52 AM

yes

#6 OFFLINE rtschaen

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Posted 26 September 2013 - 05:27 PM

Thanks

#7 OFFLINE Andavari

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Posted 26 September 2013 - 06:32 PM

1. Implement full wipe free space functionality


Already exists as the Wipe Free Space option.

2. Rename these options e.g. "Wipe Free Space" --> "Wipe Recycle Bin"


Not necessary! In Options->Settings enabling a Secure Deletion mode will secure delete the contents of the Recycle Bin. Note: From what I've observed enabling Secure Deletion also works with other files regardless of them being in the Recycle Bin or not.

Wipe Free Space and Secure Deletion options are two different things.

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