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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