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The syntax is going to look like this: Diskutil eraseDisk JHFS+ Empty /dev/disk5s2

Let’s say the disk I want to erase has “/dev/disk5s2” as its identifier and I’m going to use Mac OS Extended Journaled (JHFS+) as the system format type and name it “Empty”. This is the syntax we need: Diskutil eraseDisk FILESYSTEM DISKNAME DISKIDENTIFIER Then pick a name and a system format type.

Once you have found the proper drive to erase, just copy its identifier so you can use it for the next command. This is going to list all the mounted drives on your Mac. Start off by running the following command in the command line: Diskutil list Here I'll show you how you can erase and format a disk using the command line. To do that, the only thing you need is a bit of precise syntax to make sure that you are erasing the proper disk. But some Mac users might need to erase them from the command line on Mac OS. Most users use Disk Utility to erase a disk or hard drive.