Wipe Disk--Why need to wipe disk?

Have you ever wondered how programs such as Norton Utilities can "undelete" a file that you deleted by mistake? Let me explain how that works, and in the process, explain why deleting a file doesn't really wipe all the data on the disk.

When you create any file on your hard disk, a marker is placed at both the beginning and the end of the file. Anything in between those two markers comprises the actual contents of the file. As long as those markers exist, your computer knows not to try to store any other data in the space occupied by that file.

When you delete a file, your computer wants to get you on your way as soon as possible. So instead of wiping the entire file, your computer simply removes those markers, leaving the actual file data relatively intact. However, with the markers gone, the hard disk knows it's okay to use that physical space for some other file.

The end result is that the file data isn't really wiped out until the hard drive puts something else in its place.

This is why "undelete" utilities have virtually a 100% success rate when you run them immediately after an unintentional deletion. Since you haven't had a chance to wipe the old data with new data, these programs can figure out where the markers were and then put them back. How do you make sure a file is totally and permanently deleted ?

One of the easiest ways - although not always 100% effective - is to simply defragment your hard disk. You can use the Defrag program that comes with Windows.

When you defragment your hard drive, you rearrange the physical locations of all the files on your hard disk for optimum disk performance. Since virtually all of your files get moved during this process, the chances are high that any leftover data from deleted files will be wiped. But, there's no guarantee here. If there's not much fragmentation on your hard disk, the defrag program may not move enough files around to make a difference.

The best way to make sure files are permanently wiped is to use a program specifically designed for wiping disk free space. 

Wipe Disk-How does Internet History Eraser wipe disk?

Internet History Eraser wipes disk by overwriting free space on disk with  blank characters, it wipes the on-disk content of "previous deleted file", this makes the data unrecoverable and defeats the recovery software. 

Click Here to Download  Internet History Eraser 

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