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To do this, you’ll need to use the Diskpart command-line utility on Windows.

How to create Mac OS X bootable USB installation mediaīefore you can use TransMac, you may first need to partition your USB flash drive with a GPT partition, as a normal MBR partition may not work. Now that you have all the necessary ingredients, you’re ready to make a Mac OS X bootable USB using the DMG file of the operating system with the steps below. One high quality USB flash drive with 16GB of storage.Things to know before proceedingīefore you dive into this guide, you’ll need a few things: These instructions will also work for Windows users, who are running Mac OS X on a virtual machine and need to upgrade to the latest version. However, if you find yourself on a scenario where your device (iMac, MacBook Pro, Air, Mac Pro or Mini) is not responding and you happen to have a Windows device, then you can still be able to make a USB bootable installation media for your Mac OS X to reinstall the operating system using the Recovery Assistant.

This is why it’s recommended that you make a Mac OS X bootable USB when your Mac is in working conditions. If you’re still using a Mac OS X the time will come when your computer won’t boot, or a problem may arise where you can’t take control of the device, and booting from an OS X installation media will be required.