If you are looking forward to dual boot your Mac with Mavericks (Mac OS X 10.9) and Yosemite (Mac OS X 10.10) then here is all that you need to do. Despite there could several reasons for opting dual boot on your Mac. It could be that your system turned buggy or show up grey screen; the system might turn inaccessible. Therewith, if you try to install the operating system over the current OS X then there are some risks involved. It might turn up to situations where you might fail to boot the device or reinstall the operating system.
Now, if you install Yosemite on a separate partition then you will be on the safer edge. Mavericks will be your primary operating system, however, Yosemite is installed on a separate disk. Here you can uninstall or delete the Yosemite as and when you want to. By following this dual boot technique on your Mac you could avoid risk and data loss disasters with it.
Dual Booting Mac
Requirements- Apple states you need 8GB storage space for Yosemite to run. Nevertheless, after installation and setup, it appears to consume space that is greater than 8GB. Recommended, have about 20 GB of space available on the storage to install Yosemite.
How to do it?
Stage 1: Creating a new partition
- Open up the Mac Disk Utility
- Click on the hard drive where the current OS is installed
- Now press the Partition tab
- Hit on ‘+’ sign (plus sign)
- You can then name the partition as Yosemite
- Select Mac OS Extended (Journaled) format
- Mention the size for the new partition
- Hit on Apply button
- To confirm, click on Partition button
- Wait for a while for the partition to mount
Stage 2: Open up the Yosemite Installer File
- Navigate to the Applications folder
- Double-click over the file named Install OS X 10.10
Note: if you are using a bootable drive then, hold the Option key for the Startup Manager to appear. Then choose the new OS X Base Volume
Stage 3: Get Yosemite installed on newly created partition
Follow the instructions carefully that is provided in the install OS X screen. Now choose the newly created disk partition, i.e., Yosemite. Once after the installation process, you are displayed with a welcome screen. Thereafter you can switch between Mavericks and Yosemite in restart operation