The method of completely deleting hard disk file data under OS x system, recovery software can not be restored

Annie Zeng The door makes people very nervous about data security, even if delete + empty Recycle Bin, files and data can still be restored. Because the data is still on the hard drive, it's just tagged: "Hey, OS, this place has data, but you can write new files to overwrite it." Data recovery software Drilling The Confucius---ignore the tag and read the deleted file directly. Here is a Mac OS X operating system, the total removal of Apple hard disk file data method, recovery software can not be restored.

Go to the finder--application-utility-disk utility and select the disk partition you want to erase completely

Then, on the right, select "Erase"---"Security options"

At this point you will see a list of Delete methods, the first item is the normal delete + empty Recycle Bin. The next few goes without saying, the screenshot is very clear.

But note that 7 erase is a long process (hard drive, and 7 times back and forth), and security is high enough---the United States Department of Defense data security standards, so if not completely delete the special confidential files and data, do not choose "35 erase"---that will be a great challenge to endurance and will.

Of course, protecting files and data security does not have to be completely removed, but it can also be encrypted. Apple Computer Mac OS X operating system comes with file encryption (AES-128 and aes-256,128 bits or 256-bit file encryption ...