This is for advanced Mac users only who are comfortable with backing up their Mac, using the command line with exact syntax, and the concepts behind permanently removing data. And yes, this works to erase free space on older versions of Mac OS X too, but since they can do the same task with Disk Utility it’s perhaps a bit less relevant to the prior releases. To achieve the same secure erase in modern versions of Mac OS X you’ll need to turn to the command line.
But not everyone has an SSD drive, and thus some users may still wish to perform a secure erase of free space on their Mac hard disk. For those wondering, these features were removed from the modern version of Disk Utility in Mac OS X because they do not work on SSD volumes, which are becoming more commonplace and nearly all Mac laptops ship with them by default now.
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