![]() ![]() ![]() If you are unsure of the drive name, the diskutil list shows all installed drives and partitions. Users can also select a disc tag if desired. (level 0-4) is a number that indicates the number of passes to be written to free space, “free space” means that you are only wiping free space and not the drive itself – a critical difference – and (Drive Name) is self-explanatory. Start by starting the terminal (found in / Applications / Utilities /) and using the following general syntax, replacing the level and drive name if necessary:ĭiskutil secureErase free space (level 0-4) / volumes / (drive name) You’ve been warned, so first back up your Mac data and then proceed at your own risk. The command line requires precise syntax and is unforgivable, incorrect commands can lead to accidental deletion of data that you do not want to delete permanently, as this is a safe deletion function. How to Protect Free Space from Mac OS X El Capitan Drives via Command Prompt Without Disk Utilityīack up your Mac before attempting to use these commands. It is quite clear that this protection only removes the free space on the drive, which is intended to prevent files from being restored, it does not perform the secure deletion of the entire hard drive as described here. This is only for advanced Mac users who want to back up their Mac using the command line with precise syntax and in the background of permanent data deletion. And yes, this also works to eliminate free space in older versions of Mac OS X, but because they can do the same task with Disk Utility, it may be a little less relevant to previous releases. To achieve the same secure removal in modern versions of Mac OS X, you’ll need to return to the command line. However, not everyone has an SSD, so some users may still want to perform a safe free space erase from their Mac hard drive. Amazingly, these features were removed from the new version of Mac OS X Disk Utility because they don’t work with SSDs, which are becoming more common, and almost all Mac laptops come with them by default. ![]()
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