Secure delete Instructions

For Windows

sDelete is an utility software used to permanently delete files on Windows system.

When a file is deleted, Windows removes the index for the file, preventing the operating system from accessing the file’s contents. However, an attacker with direct access to the disk can still recover the file’s contents until it has been overwritten by another file, which might never happen. Similarly, files that have been EFS-encrypted leave behind the unencrypted contents of the file on the disk.

The sDelete tool overwrites the contents of free space on hard disks to prevent deleted or encrypted files from being recovered.

You can download SDelete from:

http://technet.microsoft.com/en-in/sysinternals/bb897443.aspx

Steps to install and use SDelete:

  • Download the zip file and extract sdelete.exe file on your computer.

  • SDelete is a command line utility that takes a number of options. In any given use:

    usage: sdelete.exe [-p passes] [-s] [-q] <file or directory> ...

         sdelete.exe [-p passes] [-z|-c] [drive letter] ...  
     -a         Remove Read-Only attribute  
     -c         Clean free space  
     -p passes  Specifies number of overwrite passes (default is 1)  
     -q         Don't print errors (Quiet)  
     -s or -r   Recurse subdirectories  
     -z         Zero free space (good for virtual disk optimization)
    

To specify the file/folder to delete, you can:

  • Type the full path to the file/folder.

  • Go to the folder that contains the file/folder you want to delete, then type file/folder name.

Example: C:\Software\SDelete>sdelete.exe -p 1 C:\YESEFT\MainReceipt.txt
SDelete is set for 1 pass.
C:\MainReceipt.txt...deleted.
1 files found