It is true that when you delete data on the hard drive, the physical proof of its removal is removed; but, the data itself continues to be stored in its original location until it is overwritten.
It is possible to replace data that has been removed from the hard drive of a computer if you so want. This will take some time, but in the meanwhile, it is possible to restore the data.
Overwrite the data on your hard disk with a software that alternates between writing 1s and 0s until it can no longer be retrieved. This should be done many times.
To make sure a file is truly gone, a number of tools are available. Eraser is a free and easy-to-use solution that will overwrite your private information with random patterns until the data is no longer recoverable. It works with nearly every version of Windows and offers a number of methods of overwriting your data, including methods approved by the Department of Defense.
Source: PCWorld
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