How does background recovery work?

is the data really "gone" when we delete files (from recycle bin too) or format complex disk?? how is data recovery possible?? if information is still present in the disc? how can we "overwrite" it near other data after formatting the drive? within this sense why can't a drive hold more data than it's actual size?

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Answers:

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Disks are divided in sector. when we write a file, we write bits surrounded by these sectors. Also a few entries within a index are created. When we delete the file, we merely delete the entries in the index, the sector stay the same until they are overwritten by another directory.

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The only True bearing to overwrite data or verbs it, is to "0" the harddrive, most harddrive manufacturers will own the program to write zero's to the harddrive, thus wiping it slick next to no possible data recovery. Source(s): A+ Technician

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when you delete background it is not removed .
the header file is changed to read aloud you can write here (thus enableing other data to be writen surrounded by that space)
so a recovery program returns this header back to influence your data is here donnot overwrite

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I found some pious info here.