For those who failed to create bootable USB with TransMac, take a look at UUByte DMG Editor. I managed to create two bootable USB from macOS Mojave and Catalina DMG file and successfully installed them on respect Mac. First, make sure the dmg file you downloaded is valid. This free USB media creation tool for Windows 10 and Mac can create USB Bootable media from ISO files devices with different settings like partition schemes, Cluster size, and file system. Jesus Vigo goes over the steps to create a bootable USB to install OS X 10.7-10.8 and OS X 10.5-10.6, as well as how to put multiple versions on the same USB.

With a bootable Ubuntu USB stick, you can:

Create A Bootable Usb On Mac For Windows

• Install or upgrade Ubuntu, even on a Mac
• Test out the Ubuntu desktop experience without touching your PC configuration
• Boot into Ubuntu on a borrowed machine or from an internet cafe
• Use tools installed by default on the USB stick to repair or fix a broken configuration

Create A Bootable Usb On Mac

Creating a bootable USB stick is very simple, especially if you’re going to use the USB stick with a generic Windows or Linux PC. We’re going to cover the process in the next few steps.

Apple hardware considerations

Create A Bootable Usb On Mac Lion

There are a few additional considerations when booting the USB stick on Apple hardware. This is because Apple’s ‘Startup Manager’, summoned by holding the Option/alt (⌥) key when booting, won’t detect the USB stick without a specific partition table and layout. We’ll cover this in a later step.