Feb 27, 2018 - Startup your Mac and immediately hold down the option + ⌘ + R key combination. Use the Disk Utility application to erase the HDD. When prompted, select the 'Mac OS Extended (Journaled)' format. Click on Disk Utility then Continue first of all to get your Mac's hard drive wiped. Select your startup drive on the left (typically Macintosh HD), switch to the Erase tab and choose Mac OS. ![]() Using an external drive to install Mac OS X Mountain Lion can save some time if you have to install the operating system on multiple computers. Bitdefender antivirus for mac vpn. You'll need to purchase a license for each computer you are using, but you can use the same installation software on each computer. This prevents the need to download Mac OS X Mountain Lion from the Apple servers each time you want to install the software. You can also use an external drive to do a fresh installation of Mountain Lion on a hard drive that doesn't have the Mac OS X Recovery partition installed. If your computer still has an operating system installed, then you can download the Mac OS X Mountain Lion software from the Apple Store to your computer. Once the software has completed downloading, force-quit the installer and then locate the Install Mac OS X Mountain Lion application package in the Applications folder. Right-click on the application and select 'Show Package Contents.' Look for a file called InstallESD.dmg by opening the Contents folder and then looking in the Shared Support folder. Copy the file to your Desktop for later use. Connect your external drive to your computer. Open Disk Utility by opening your Applications folder and clicking on the Disk Utility app within the Utilities folder. Select the external drive and then click the 'Erase' tab and select 'Mac OS Extended (Journaled)' for the format. Once you've set all the options, click the 'Erase' button. After you have erased the external drive, drag the InstallESD.dmg file to the Disk Utility sidebar. Click on the disk image to highlight it and then select the 'Restore' tab. Drag the external disk's icon to the Destination field, then click the 'Restore' button. After booting to your external disk, you can follow the prompts to verify your Mac OS X installation and begin setting up your operating system. You'll be asked to enter the Apple ID credentials that you used to purchase Mac OS X Mountain Lion. Once verified, select the hard disk on the computer to which you want to install Mac OS X and then follow the prompts to continue with a standard installation. When you purchased Mac OS X Mountain Lion, you were provided with a license to install the software on any Mac computer you own. Only purchase a new license if you are installing Mac OS X on a friend's computer or a computer you do not own.
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