![]() We will need a copy of the installer dmg. This recipe will explain how to make a USB Thumb Drive bootable with the OS X Lion Developer Preview installer on it and in turn allow you to install Lion on a Mac without an optical drive (ie Macbook Air line). ![]() If it has a different name, replace MyVolume in these commands with the name of your volume. ![]() These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. How to create a bootable installer for macOS. ![]() In the right-side panel of Transmac, right click on your USB Drive Format Disk Format with Disk Image (see attached screenshot) Point to your.dmg file and click Open. Download Transmac and install in Windows. Transmac for Windows (2-week trial) can format USB drives for mac and restore.dmg files to USB drives. 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. 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.
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