When you delete a file and think it’s gone for good, it may not be the case. “Delete” is actually just another word for “hidden”, when it comes to your PC. Even after emptying your Recycle Bin/Thrash, things lie around in your hard disk. When you delete a file, Windows simply removes the reference to the deleted file from the file system, but disk clusters still retain the data. Therefore, it just marks the data as deleted so the space can be used again, but the data itself remains on the hard drive and recoverable until it is overwritten by something else. On a hard drive with lots of free space, this could take months or even years. So, your confidential information can still be accessed by others even after file deletion.
Therefore, the question arises, how to completely get rid of any data. The simple solution is to use a File Shredder. It is a specially designed software program to “secure delete” any kind of file from your disk. It can be referred as a paper shredder which shreds them in numerous tiny bits to eliminate any chances of it being readable. File shredding is also similar but in this case it means overwriting the data many times in codes.
Even after deletion, your PC may still hold much of your personal information like passwords, banking information, credit card numbers, address books, social security number, personal emails, etc without your knowledge. You may also have information which can be confidential or you don’t want it to be accessed by anyone else. Most of this deleted information can still be recovered by using special recovery programs, so it is still available to hackers, identity thieves, enemies and other spies.
A file shredder removes every change of your valuable data being discovered after your discard them. In order to remove, or shred files permanently from your system you have to use a program that is capable of rewriting the files with random series of binary data multiple times like 00, 0011 or 1010. This process is often called shredding. Thus, the actual content of the file gets overwritten and the possibilities of retrieving them are eradicated completely.
Kernel file shredder is a free file shredder for initial 30 days from download. Use it to securely erase anything and eliminate any chances of it being recovered. It uses various intensive shredding algorithms like US Army AR380-19 (3 passes), Peter Gutmann (35 Passes), DoD 5220 + Peter Gutmann, and German VSITR (7 Passes). It supports Windows 7, Windows Vista, Windows XP, Windows 2003, Windows 2000, Windows 2003 Server, Windows 2000 Server, Windows 2000 Advanced Server, and Windows 2008 Server. Read more here http://www.nucleustechnologies.com/kernel-file-shredder.html