If you’re a Mac OS X user 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. This is why it’s recommended that you make a Mac OS X bootable USB when your Mac is in working conditions. 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 PC, then you can still be able to easily make a USB bootable installation media for your Mac OS X to reinstall the operating system using the Recovery Assistant. Bear in mind that this will also work for Windows users, who are running Mac OS X on a virtual machine and need to upgrade to the latest version. For example, to OS X Yosemite.

Things to know before proceeding Before you dive into this guide, you’ll need a few things: • A broken Mac computer with Mac OS X. • A trial copy of the TransMac software. • One high quality USB flash drive with 16GB of storage. • A copy of Apple’s macOS (DMG file). 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.

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Open Disk Utility on your Mac (located in the Utilities folder) and find the “Burn” option. Step 6: Select Burn and choose the InstallESD.dmg file that you saved to your desktop. Here's how to partition your Mac. What is a disk partition? Partitioning your Mac is basically splitting your hard drive into separate, usable systems. It makes it possible to run two separate operating systems on one device, like Windows and macOS or two versions of macOS (like High Sierra and Mojave).

How to make a Mac OS X bootable USB installation media Before 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. To do this, you’ll need to use the Diskpart command-line utility on Windows. • Open Command Prompt with administrative permissions.

• Type the diskpart command and press Enter. • Type the list disk command to view a listing of drives connected to your computer and press Enter. • Type the select disk command followed the number assigned for the USB flash drive (e.g., select disk 4), and press Enter.

• Type the clean command and press Enter. • Type the convert GPT command and press Enter. • Type the create partition primary command and press Enter to complete the task. After converting the USB flash drive from MBR to GPT format, you can use the steps below to create a bootable USB installation media to install Mac OS X.

Nonetheless, if you are looking to create a macOS Mojave USB installer, follow the steps below. Things to Know. Before you jump to the steps below, here are a few things you should know: Make sure the Mac that you want to install macOS Mojave on is compatible with the OS. Use a fast USB drive with at least 16GB of free storage space. Here are the steps to create a macOS Sierra bootable USB media with GPT partition support on Windows 10 to rescue your Mac computer. Check the non-startup drive that you can install Sierra on (usually, the installer will display the default target for the installation of macOS Sierra as the startup drive (Macintosh HD). So, you should to click the Show All Disks button, and the installer will display a list of all attached volumes).

•, which is the software that will make everything happen. TransMac is a paid software, but it has a 15-day trial solution, that give us more than enough time to move the DMG files to the USB drive from Windows. (If you want to support the developer, you can purchase the full version.) • Insert the USB drive that you’ll use to fix your installation of OS X. Remember that all the data in the USB will be erased. Make sure you take off any important documents.