
In the modern world we all use our Computers and phones to save our details and other data like usernames and Passwords, Photos, Videos etc.When you delete files or folders, the data is not initially removed from the hard disk. Instead, the space on the disk which your got by deleting would be "deallocated." ,Thus the space can be used for new data. Until the space is overwritten, it is possible to recover the deleted data by using a low-level disk editor or data-recovery software.
To protect your secret/ private files from getting wrong handed, there is a free command line utility provided by Microsoft called SDelete (Secure Delete). Using this software you can overwrite all free allocated spaces in your hard disk/ Memory card/ Pen drive etc.
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