Level should be one of the following: o 0 - Single-pass zero fill erase. Ownership of the affected disk is required. Erasing freespace on a volume will leave your files intact, indeed, from an end-user perspective, it will appear unchanged, with the exception that it will have attempted to make it impossible to recover deleted files.If you need to erase all contents of a partition but not its hosting whole-disk, use the zeroDisk or randomDisk verbs. Secure erasing makes it harder to recover data using "file recovery" software.Erasing a whole-disk will leave it useless until it is partitioned again. Within the man pages, you’ll find the explanation for how to securely erase a disk’s free space using diskutil: secureErase level deviceErase, using a "secure" (but see the NOTE below) method, either a whole-disk (including all of its partitions if partitioned), or, only the free space (not in use for files) on a currently-mounted volume. To find out about diskutil in detail, type man diskutil at the Terminal prompt. ![]() Proceed with caution, and make sure your backups are current before you try any of the following.) (Please note that, as with many Terminal commands, there’s a chance of Really Bad Things happening if you make a mistake with the following instructions. ![]() What if you want to do this from Terminal instead? In Terminal, a program named diskutil provides most of the features of macOS’s Disk Utility.
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