![]() Keep holding until the described behavior occurs. To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. I already was able to rip it into a DMG file. Is there a way i can take my snow leopard user DVD, and make a bootable USB out of it on Windows. Tip: If there are several USB storage devices connected to your Mac, Startup Manager will only list the ones containing bootable volumes. Step 4: Double-click or press the Return key to boot your Mac from the selected volume. Step 3: Highlight the volume you want to use by using your mouse or trackpad, or left and right arrow keys on the keyboard. ![]() The process is fairly painless and, if you have a bit of time and patience you. CD/DVD drives are disappearing from computers, leaving USB storage as the only option when re-installing an operating system. If you want to do a clean install of macOS Sierra, or you have multiple Macs to install it on, then a bootable flash drive for is your best bet for easy installation. I now need to create a bootable USB drive from the DMG file but I need to be. I backed up the Lion dmg file when I purchased it via the Mac App Store. A Mac machine needs to be reformatted with Lion.
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