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When I delete a document/file from my hard drive is it really deleted and unretrievable?

April 26, 2017delete deleted DOCUMENT file

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When I delete a document/file from my hard drive is it really deleted and unretrievable?

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The DOS and Windows commands to delete files do not delete the data from your hard drive. They merely delete their own record of the fact that the area of the disk they occupy is unavailable to other uses. Consequently, the undelete commands merely have to change the character back to restore the data, as is demonstrated retrieving deleted files from the Windows recycle bin. Contrary to popular belief, reformatting the hard drive does not affect the disk data. The command merely formats a new file record for that logical drive. It does not remove the data until the system overwrites it with new data.