HOW IT'S POSSIBLE TO RECOVER DATA FROM HARD DISK

        when we copy large size file in to hard disk, need lot of time for completion, 

the same think, when  we delete same large file its need only seconds,

because the think is that actual file is not delete in the hard disk. 

file are just invisible. we will copy other files in same hard disk sector. 

first file will totally delete. the same process is continuing. so we can recovery data simply

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