how to secureErase your disk with diskutil¶
on macOSman diskutil
NOTE: This kind of secure erase is no longer considered safe. Modern devices have wear-leveling, block-sparing, and possi- bly-persistent cache hardware, which cannot be completely erased by these commands. The modern solution for quickly and securely erasing your data is encryption. Strongly-encrypted data can be instantly “erased” by destroying (or losing) the key (password), because this renders your data irretrievable in practical terms. Consider using APFS encryption (File- Vault).
Level should be one of the following:
o 0 - Single-pass zero-fill erase.
o 1 - Single-pass random-fill erase.
o 2 - US DoD 7-pass secure erase.
o 3 - Gutmann algorithm 35-pass secure erase.
o 4 - US DoE algorithm 3-pass secure erase.diskutil list diskutil secureErase 2 /dev/disk2
create a bootable usb drive with unibeast, boot computer from usb drive like macOS’s command+R.