Enter a volume ‘ Name’, choose a ‘ Format,’ and click ‘ Security Options…’. Choose the hard drive volume that contains files that you want to remove. Click on Launchpad and open ‘ Disk Utility’ under Utilities. Thus, if you want to permanently delete or secure erase individual or only a few selected files from Mac drives, skip to the last steps to permanently delete files on Mac with secure file erasure software. These two methods can help you wipe a Mac hard drive volume (other than the system volume) or physical external hard drive with DoD 5220.22-M standard. IMPORTANT NOTE: With the first two methods-Disk Utility and Terminal Command-you can’t permanently delete individual files from Mac hard drive. Steps to Permanently Delete Mac Files with Disk Utility. In Mac, you can do this via Disk Utility, Terminal Command, and by using a secure file erasure tool such as BitRaser for File Mac. Thus, to permanently delete and secure erase data from a Mac hard drive, you need to overwrite it deliberately with the help of a secure data erasure standard such as DoD 5220.22-M, NATO, etc. 
However, the actual file and data remain on the Mac hard drive unless overwritten. In other words, when you erase a file in Mac, only the pointer location to the file is deleted from file system journal. However, this file erasure in Mac is similar to file deletion in Windows. In Mac systems, unlike Windows, you don’t delete but erase files.
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