see the 3 methods to create bootable windows 10 USB using free tools. Once your bootable USB installation media is ready, remove it and insert it into your Mac, power it on, hold down the Option key, and select the USB you just created to reinstall Mac OS X.The faster way to install Windows without using any DVD is USB Windows bootable. Depending on your computer and other variables, it could take one or two hours to complete the process. 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 the OK button to create a bootable USB of the operating system. In the warning dialog box, click the Yes button. On the left pane, you’ll see all the Windows PC drives listed right-click the USB drive you intend to use to reinstall Apple’s OS X and select the Restore with Disk Image option. (You’ll be prompted to Enter Key or Run because we’ll be using it once, click the Run option.) Right-click the TransMac software icon and Run as administrator. Make sure you take off any important documents.) (Remember that all the data in the USB will be erased. Insert the USB drive that you’ll use to fix your installation of OS X. (If you want to support the developer, you can purchase the full version.) Quick note: TransMac is a paid software, but it has a 15-day trial solution that gives us more than enough time to move the DMG files to the USB drive from Windows. Use these steps to set up a USB drive with a GPT partition: To do this, you’ll need to use the Diskpart command-line utility on Windows 10. Create Mac OS X bootable USB installation mediaīefore using TransMac, you 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.