How to Dual Boot OS 10.9 Mavericks and OS 10.8 Guide

This guide is about Dual Boot OS X 10.9 Mavericks and OS X 10. I will do my best so that you understand this guide very well. I hope you all like this guide to Dual Boot OS X 10.9 Mavericks and OS X 10.8.

Configuring two boot platforms for OS X Mavericks and OS X 10.8 (or even 10.7 and 10.6 if you have an older version of Mac OS X) is easy and allows you to test and develop a new installation of Mavericks. Because the original OS X installation is still intact, giving Mavericks a test drive is the safest way to go, perfect for running developer previews, or if you’re not sure you’re ready to run OS X 10.9 yet. all the time.

You don’t need another hard drive to do this, but you use the unused space on your current drive to create a new partition that uses an alternate operating system. If you want, this process can be done from the Mavericks boot drive, and using such a USB installer will avoid any possible errors in Disk Utility (more on the common errors that may appear at the bottom of the article this), but it is not necessary.

Be sure to back up your Mac before editing the partition table. The easiest way to do that is to start Time Machine right away instead of waiting for a scheduled backup. Have it ready before you start.

Partition and install OS X Mavericks on a dual-boot Mac

  • Start Disk Utility from /Applications/Utilities/
  • Select your hard drive from the menu on the left, then select the “Partition” tab
  • Click [+] plus a button to add a new partition, reduce the size to at least 12GB, and name it something logical, like “Mavericks”, and then click “Apply”
  • Create a dual boot partition for OS X Mavericks

  • Close Disk Utility when you’re done, and then run “Install OS X 10.9” from the /Applications/ folder
  • In the installation menu, select the Mavericks partition you created as the destination drive, and then click Install (you may need to click “Show all disks” to display the partition)

Install OS X Mavericks on the new partition for dual booting

OS X Mavericks will be installed, and when it’s done, it will launch directly to version 10.9.

To switch between boot versions of OS X, restart your Mac and hold down the Option key, then select any partition you want to boot from. You will notice that the original boot menu does not show the OS X version, so it is important to name the Partitions quite explanatory, such as “Mavericks.” You can also change the startup disk by going to the startup disk in System Preferences and choosing the OS X partition you want to use. The Options panel option shows the OS X versions of each partition.

The whole process should work smoothly, but if Disk Utility throws an error, it’s likely to be a “Failed to Remove Disk” or “Failed to Lot” message, both of which require a restart. and slightly different methods to solve. It can be mitigated by using a USB installation disk instead of trying to partition from an active boot drive.

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FAQ: Dual Boot OS X 10.9 Mavericks and OS X 10.8

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