How To Dual Boot Mac OS X Mountain Lion 10.8 and OS X Mavericks 10.9

In the video below, we'll be showing how to dual boot OS X Mountain Lion 10.8 and Mavericks 10.9 Developer Preview version. Also Included, is the raw script of the video if you wish to follow along. 

TRANSCRIPT:

 In this Episode we'll be demonstrating How to Dual Boot OS X Mountain Lion 10.8 and Mavericks 10.9.


How To Dual Boot OS X Mountain Lion and OS X Mavericks.

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Let's Get Started "What You'll need" An Intel Based Mac System with OS X Mountain Lion 10.8 installed. And a copy of OS X Mavericks 10.9 Developer Preview. As always... Make sure that you have made a backup of your hard drive, especially when working with Partitioning your hard drive using the Mac Disk Utility program. So with all that out of the way, the first thing we'll need to do is Partition a space on your Hard Drive. In my case, as I have several Partitions, I'll be Partitioning a space on the hard drive Labeled Macintosh HD, which contains OS X Mountain Lion. Basically use any hard drive(s) that you have sufficient space on. I'll be creating a partition of 30 Giga Bytes for Mavericks. So to do this, we'll need to launch the Disk Utility Program, click LaunchPad and in the Other Folder click the Disk Utility Icon. Once launched, click the Main Hard Drive for the Mac. Now click the Partition Tab, now enter a value or drag the re-size control that you want the Macintosh HD to have, since I want 30 GB for OS X Mavericks,  I find it easier to just subtract that amount from the Macintosh HD. Once done, click Apply, then the Partition Button if you are sure then Your Admin Details to confirm. This took about 15 section. Next we need to initialize or prepare the 30 Giga Bytes partition for OS X Mavericks, to do this click on the Plus button here and choose an appropriate name instead of the default, we'll name it appropriately as Mavericks HD. Now click the Apply button and like before click partition and then enter your Admin Details.  We can now close the Disk Utility window. That takes care of the Partitioning Section. Next, we need to Install OS X Mavericks. If you've downloaded it, it should b in the Applications Folder. Double click the Install OS X 10.9 icon to launch the install process then click continue to begin the installation. After agreeing to the terms, click the Show All Disks... Button, then navigate to the just created Mavericks HD  icon.  Click once to select it then the Install Button to begin, confirm by entering your Admin Details. This completes the first stage for installing OS X Mavericks, the Mac will now reboot to complete the second stage on the the install. It took me approximately 24 minutes to complete the second stage, the final stage is entering you login details for OS X Mavericks, the entire process took about 30 minutes...I'll just time lapse the second and final stages to save time. Once completed, the Mac will always boot in OS X Mavericks by default. We'll show you how to do this if you wish in just  moment. Now, to reboot in OS X Mountain Lion, shut down the Mac, then Turn it back on with the Option key constantly pressed till you here the familiar Boing sound. Now click on the Macintosh HD Icon to boot OS X Mountain Lion. As mentioned earlier, if you wanted to change the boot sequence of OS X.  Simply Launch System Preference then click the Startup Disk icon, as you can see the default OS X Mavericks HD is highlighted. To make OS X Mountain Lion as the default startup disk simply press the lock to make changes then enter your Admin Details then the Unlock Button. Now all Disks are Highlighted, click on the Macintosh HD Icon to select this as the Default startup Disk and then click on the Lock to confirm. And that's all folks....All done. Thanks for Watching Please give a Thumbs Up if you liked this video and...Don't forget to subscribe to be notified of the latest upcoming episodes. Thanks and Peace.