UPDATED 2/11: 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.

Boot Camp Assistant guides you through installing Windows on your Mac. Open this app from the Utilities folder inside the Applications folder. Then follow the onscreen instructions to repartition your startup disk and download related software drivers for Windows.
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. Specializing in Mac and Windows.

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:

Installing Windows 10 on a Mac without Bootcamp. Creating a Bootable USB Windows 10 Installer Formatting Your USB Stick. Attach your USB stick and start Disk Utility, select your USB drive in the left panel under External. Configuring Windows Mapping Your Mac Keyboard. Microsoft offers a simple tool to create a bootable USB on Windows, but there is no such tool for Mac users. Fortunately the process is pretty easy, if you know how. Plus, this is a great opportunity to get Microsoft’s last version of Windows for free.

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.

How to create 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.

Setting up GPT partition

To set up a USB drive with a GPT partition, use these steps:

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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.

Creating USB install media

To create a bootable media to install Mac OS X, use these steps:

Download and install a copy of TransMac, 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.
Right-click the TransMac software icon and Run as administrator. You’ll be prompted to Enter Key or Run, because we’ll be using it once, click Run.
On the left pane, you’ll see all the Windows PC drives listed, right-click the USB drive you’re intending to use to reinstall Apple’s OS X and click Restore with Disk Image.
In the warning dialog box, click Yes.
Use the Restore Disk Image to Drive dialog box to browse for the DMG file with the installation files for Mac OS X Yosemite in this case, and click OK to create a bootable USB of the operating system.
Now, you’ll have to wait a long time. No kidding. It could take one or two hours to complete the process depending on your computer and other variables.

Once your bootable USB installation media is ready, remove it and insert it into your Mac, power it on, holding down the Option key, and select the USB you just created to reinstall Mac OS X.

If you’re having issues trying to create a bootable media, you can get a USB flash drive that comes with Mac OSX ready to install.

macOS flash drive | See at Amazon

OS X 10.12 Sierra flash drive | See at Amazon

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macOS Sierra flash drive | See at eBay

Update February 11, 2019: This guide has been revised to make sure it includes the latest changes.

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