If you want to know how to create a bootable USB to install macOS Big Sur, Catalina, Mojave, and High Sierra, then this post is for you. You can use this bootable USB macOS installer to perform a clean install of macOS, install macOS from USB on a separate volume of your Mac drive, or in case your Mac encounters OS issues. Boot the device that you want from the USB stick.If you plan to install macOS on multiple Mac systems and don’t want to download the installer multiple times, then you can create a bootable installer. Run diskutil eject /dev/diskN and remove your flash media when the command completes.Start the 'Disk Utility.app' and unmount (don't eject) the drive. Note: If you see the error dd: /dev/diskN: Resource busy, make sure the disk is not in use. Use the same command but replace bs=1m with bs=1M. Note: If you see the error dd: Invalid number '1m', you are using GNU dd. Note: Using /dev/rdisk instead of /dev/disk may be faster.
Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace /path/to/downloaded.img with the path where the image file is located for example.Run diskutil unmountDisk /dev/diskN (replace N with the disk number from the last command - in the previous example, N would be 2).Run diskutil list again and determine the device node assigned to your flash media (e.g.Run diskutil list to get the current list of devices.dmg ending on the output file automatically. Hdiutil convert -format UDRW -o /path/to/target.img /path/to/source.iso Open the Terminal (in /Applications/Utilities/ or query Terminal in Spotlight).Tip: Drag and Drop a file from Finder to Terminal to 'paste' the full path without typing and risking typos. img file that you will be required to create from the. This quick step by step will show you how to make a bootable USB stick from a downloaded ISO image file using an Apple Mac OS X.
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