If you're having trouble erasing a disk with the Disk Utility app, want to have a backup method, or just want to learn more about the Terminal, here's a beginner's walkthrough on locating, unmounting, erasing, and "securely" erasing a drive with the Mac's terminal

00:00 - Intro
00:42 - Locate the Drive Path
02:18 - Unmounting the Drive
03:32 - Erasing the Drive
05:27 - "Securely" erasing the Drive

Commands used (replace "X" with the number of your disk) :
- Locate disks: diskutil list
- Unmount a disk: diskutil unmountDisk /dev/diskX
- Force Unmount: diskutil unmountDisk /force /dev/diskX
- Erase (replace FORMAT with format you want and DRIVE_NAME with the new name for your drive):
diskutil eraseDisk FORMAT DRIVE_NAME /dev/diskX
- "Secure" erase (replace LEVEL with the secure erase level you want to use:
diskutil secureErase LEVEL /dev/disk#


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