By default when we delete a file or folder from our Windows computer, it gets stored in Recycle Bin. Files and folders from the Recycle Bin can be recovered restored to its original place. If you empty the Recycle Bin or deletes a file/folder by pressing Shift + Del button then also it can be recovered by data recovery software, means you are still not safe.
Moreover, the deleted data can be recovered from the formatted disks also. If you have sensitive data on your computer and want to completely erase it, you need to take the help of a third party tool, the Folder Shredder.
Folder Shredder is a freeware app for Windows that lets you permanently delete all the sensitive digital information from your computer such as documents, music, videos, photos, software, etc.
It comes in a portable format, means there is no need to install in your PC, just launch and start shredding the folders. The interface of this tool is quite simple, you just need to select the folder and then click the Start Shredding button.
FolderShredder overwrites over and over on alternate patterns, rewrite files in binary mode, shrink files, rewrite again and encrypt, rename, and then Delete; that makes impossible to recover the deleted data.
The application claims to have military grade shredding, with almost 20 times rewrite so that it is not recoverable.
There are two executable files are available for download, one is with the black interface and another one with white. You can get it from here.