@nikita69, yup but even Zerofill is not the most secured one. Chances are that 99% can be recovered if not physically destroyed. Even demagnetizing doesnt help at all. The 0's and 1's can be realigned.
However the process with Zerofill basically write patterns of all 0's to the harddrive media. It starts by writing on the empty space of the hdd and then over the data . It makes very hard to recover. But I have heard cases where data has been recovered, obviously not by simple means.
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