If you have deleted a file and empty the trash, do you think the data is safe enougt that can not be seen by other people? No! The data is still on your disk, they only say: Hi, system, you can write anyting on this place of the disk without warrying about data corruption. So others can steal the deleted data by recovery software.
Anyway, we can delete the data completely on Mac, without any help of 3rd party software. Let’s make the data stealer found it a wast of time to recover deleted files on Mac.
Open Finder–>Applications–>Utilities–>Disk Utility.
Disk Utility
Choose the disk that you want to delete
Choose the disk that you want to delete completly
Choose “Erase” on the right panel, click “Security Options…”
Delete all the data on the disk
OK, the real-tech-thing comes 
. The 1st option is the same way we delete files, fast but not safe. And the 2nd option is much better for data security, Mac will write all the disk with “0″–you know there are only “0″ and “1″ in computer’s world. And all your files will be covered.
Choose a way to erase data on the disk
Not safe enough? We have option 3! To write “0″ and erase the disk 7 times. US Department of Defense standard for securely erasing magnetic media, sounds good, yes? By the way, if your disk is large, it will take you a lot of time to complete this task—-the motor of the hard disk will make a mad run for hours.
Don’t choose option 4 unless you want to test your endurance and willpower. Yes, it might be safer, but who cares? 7 times pass erase is safe enough. Maybe you will have to wait for a whole day waiting for the read-write indicator turns off.
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