Because most Macs now come with Solid State Drives (SSDs) instead of regular hard disks, Apple feels there is no need for the feature. Modern versions of macOS, and later versions of OS X, like El Capitan, don’t include the Secure Erase Free Space feature in Disk Utility. The feature allowed you to overwrite the free space on a drive to prevent deleted files from being recovered.
The Secure Erase Free Space feature in Disk Utility on your Mac added a layer of privacy and security to file deletion. What Happened to Secure Erase Free Space in macOS?
Securely Wipe the Free Space on Your Mac Using CCleaner.Securely Wipe the Free Space on Your Mac Using the Command Line.What Happened to Secure Erase Free Space in macOS?.
