![]() Press the Enter key and your external drive will be erased completely.Next, type: diskutil eraseDisk JHFS+ (diskname diskidentifier).This can take fairly long, depending on the speed of your. Click Restore, and Disk Utility will start the copying process. You can also choose an ISO image, but that doesn’t have much use here. Now you’ll see a list of disks there, target yours through the disk identifier. Select your external drive in the sidebar, click Restore in the menu, and then select your main drive as the Restore From option. ![]() Open it and enter this line: diskutil list.You can also try the Terminal app, though it’s a command-line tool that requires you to be a bit geeky. If for any reason Disk Utility fails to wipe your drive. Wipe External Hard Drive on Mac via Terminal (Command Line) It’s because SSDs don’t have to go through this process due to the way it manages files. Note: If your drive is an SSD, you won’t be able to click “Security Options” as this option will be grayed out. Here you can specify how securely you want to wipe the drive, move to Most Secure if you are paranoid because this option overwrites more times to the disk space, though the process tends to be slower.Next, click the Security Options button at the bottom.Choose a file system to which you want to format your external drive. ![]()
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