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man diskutil ช่วย:
zeroDisk [force] device
Erase a device, writing zeros to the media. The device can be a whole-disk or a partition. In either
case, in order to be useful again, zero'd whole-disks will need to be (re)partitioned, or zero'd parti-
tions will need to be (re)formatted with a file system, e.g. by using the partitionDisk, eraseDisk, or
eraseVolume verbs. If you desire a more sophisticated erase algorithm or if you need to erase only
free space not in use for files, use the secureErase verb. The force parameter causes best-effort,
non-error-terminating, forced unmounts and shared-mode writes to be attempted; however, this is still
no guarantee against drivers which claim the disk exclusively. In such cases, you may have to first
unmount all overlying logical volumes (e.g. CoreStorage or AppleRAID), or, if a disk is partially dam-
aged in just the wrong way, even un-install a kext or erase the disk elsewhere. Ownership of the
affected disk is required.
randomDisk [times] device
Erase a whole disk, writing random data to the media. Times is the optional (defaults to 1) number of
times to write random information. The device can be a whole-disk or a partition. In either case, in
order to be useful again, randomized whole-disks will need to be (re)partitioned, or randomized parti-
tions will need to be (re)formatted with a file system, e.g. by using the partitionDisk or eraseDisk
verbs. If you desire a more sophisticated erase algorithm or if you need to erase only free space not
in use for files, use the secureErase verb. Ownership of the affected disk is required.
secureErase [freespace] level device
Erase, using a secure method, either a whole-disk (including any and all partitions), or, only the free
space (not in use for files) on a currently-mounted volume. Erasing a whole-disk will leave it useless
until it is partitioned again. Erasing freespace on a volume will leave it exactly as it was from an
end-user perspective, with the exception that it will not be possible to recover deleted files or data
using utility software. If you need to erase all contents of a partition but not its hosting whole-
disk, use the zeroDisk or randomDisk verbs. Ownership of the affected disk is required.
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 secureErase 0 /dev/diskXดูเหมือนว่าคำสั่งที่ถูกต้องสำหรับกรณีของฉันคือ