I am using a program which creates a hidden folder normally unfindable by other programs, its designed to keep private files and folders safe, but when I delete something from this folder, it sometimes is overwritten by other files in my hidden folder. This completely defeats the purpose of having the files hidden. My suggestion is that there be some option implemented into both Recuva and CCleaner where you can choose which files are used to overwrite secure deleted files. This way any private files, such as work documents or family photos cannot overwrite other files.
It's just the nature of Windows, or any file management process. If a file is deleted then the space it occupied can be used by part or all of any other live file. I have found from experience that even some old live files appear in the space that newer deleted files used to occupy, so Windows must be file shuffling to keep itself occupied.
When deleted files are displayed with Recuva or a similar program then you may well see some live files displayed. There is nothing that CC or Recuva can do to stop this. Whatever CC or Recuva uses to overwrite securely deleted files (and I use one overwrite which uses char zeroes) then it can be overwritten with live data within seconds.
Someone with more experience than me might suggest a workround involving partitions or separate drives which can overcome this.
After messing around a bit I found that any files in a rar folder are not used to overwrite secure deleted files. Just to you all know.
I'm not sure what you mean, no file is 'used' to overwrite another, it's just that new files are placed in the sectors previously occupied by a deleted file.
Perhaps your rar folders are in some secure area which is somehow fenced off from other file allocation, I don't know how that works. But if this area sits on top of previously deleted files, maybe Recuva can still look at this area?
If your files are secure what was causing your original concern, and has that been fixed?