To erase a disk from the command line on the Mac, we’ll use the familiar “diskutil” command with the eraseDisk verb and other appropriate flags to specify options for how we want to erase the disk, and to identify which disk is to be erased. It can be found with Spotlight, Launchpad, or in the /Applications/Utilities/ folder. To get started, you’ll need to launch the Terminal application on the Mac which gives access to the command line. How to Erase a Disk from the Command Line of Mac OS Remember the command line is unforgiving, if you are not comfortable at the command line it would be much more appropriate to erase and format a disk using Disk Utility in the standard interface of Mac OS X. Do not misunderstand that, otherwise you will inevitably permanently lose data when it is erased and destroyed. The entire target disk is erased, all data on the target disk is destroyed using this approach, with no volumes or partitions or any data remaining. Notice that this is aiming to erase the entire disk from the command line here, this is not just erasing a volume or partition on the target disk. You can choose any common file system format the disk to after it has been erased, including ExFAT, FAT32, HFS+, or JHFS+. This guide will walk through how to erase and format an entire target disk using exclusively the command line on any Mac using macOS or Mac OS X.
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