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joeblau / OSX Secure Disk Wipe.md
Last active February 15, 2026 10:37
Securely erase an external disk using dd on OSX

Securely erase an external disk using dd on OSX

  1. Plug in your SD card, HDD, or other block device and then use the following command to see which /dev/diskN node it's located on:
diskutil list
  1. Unmount the disk where “N� is the number of the disk taken from the above command: