Disk Cleaner--Why need to clean 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 delete all the data in that file.

When you create any file on your hard drive, 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 deleting the entire file, your computer simply removes those markers, leaving the actual file data relatively intact. However, with the markers gone, the hard drive 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 overwrite 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 drive. 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 drive for optimum drive 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 overwritten. But, there's no guarantee here. If there's not much fragmentation on your hard drive, the defrag program may not move enough files around to make a difference.

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

Disk CLeaner-How does Tracks Eraser Pro clean disk?

Tracks Eraser Pro cleans the hard disk by overwriting free space with blank characters, it overwrites the on-disk content of "previous deleted file", this makes the data unrecoverable and defeats the recovery software. 

Click Here to Download  Tracks Eraser Pro