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#Mac os mountain lion usb boot how to
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Once the USB drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab.

Keep a backup of the files within if you still need them, then come back to this section. Note: This will remove everything in the USB drive.

#Mac os mountain lion usb boot mac os

Under Erase tab, select Mac OS Extended (Journaled) format and click the Erase button.

Select the USB drive on the left menu, Erase tab.

Plug your USB drive into your Mac and launch the Disk Utility application.

Double-click InstallESD.dmg to open (or mount) it on your Desktop.

Navigate to Contents > SharedSupport, then look for the filename "InstallESD.dmg".

Look for the file called "Install OS X Mountain Lion", Right-click and select Show Package Contents.

#Mac os mountain lion usb boot download

Create bootable OS X Mountain LionĪfter your download is done, let’s proceed to making a bootable USB drive with your OS X Mountain Lion in it. Note: This may take up between 10 and 60 minutes, depending on the speed of your Internet connection. If you’ve previously purchased a copy of Mountain Lion, don’t worry, you will not be recharged. Re-enter your App Store credentials if required.Look for OS X Mountain Lion, hold down the Option key and click Download.Launch the App Store and go to the Purchases tab.Here’s how you can download and obtain a soft copy of Mountain Lion. The installer you downloaded from the App Store automatically deletes itself after you’ve successfully upgraded (or install) your Mac. Re-download Mountain Lion Installerįirst, grab hold of a copy of the Mountain Lion installer file. However, these do tend to stick at certain points while the system's busy and the whole process should be done in just over an hour.While I was doing maintenance for my OS X, using the Maintenance app, the app told me that. Small addition - when installing from DVD the progress bars will lead to you to believe it's actually going to take forever, if not slightly longer.

#Mac os mountain lion usb boot install

I have had a successful boot and install from DVD on a MacBook (school's out for Easter so no access to a Mac Pro at the moment) so at least we know it's possible to create a working DVD installer. This should in theory be much quicker but I've not tried it out yet. Still, it's better to get there slowly than not at all -)Īlternatively, if you have a spare hard disk you could clone the Yosemite USB installer partition onto that using Disk Utility's Restore function. Be warned, booting from the Yosemite DVD will take a small eternity, the installation itself will take quite a bit longer. If you can boot from the original Apple installation discs you should be able to boot from your newly created DVD, and hopefully it will appear as a boot option. You will need a dual-layer DVD for the burning operation. This should be listed in Disk Utility on the lower left pane - highlight it and select Burn. Select DVD/CD master as the image format then hit the Save button when you're ready.Īfter a few moments you will have a disk image with the extension.

Highlight the partition Install OS X Yosemite on the upper left pane then go to File > New > Disk Image from "Install OS X Yosemite".

If not, read on.įirst, mount your USB installer and then go to Disk Utility.

#Mac os mountain lion usb boot how to

If you know how to do this then ignore the rest, grab a dual-layer DVD and get cracking. If your Mac Pro has issues with booting from USB but will boot from a DVD, create a DVD from the USB installer.