This guide is about the How to Install OS X Yosemite Beta on a New Partition & Safely Dual Boot. I will try my best so that you understand this guide very well. I hope you all like this guide How to Install OS X Yosemite Beta on a New Partition & Safely Dual Boot.
OS X Yosemite is an amazing upgrade to a Mac that is actually more experienced than seen, but due to its current early beta state, it’s usually not a good idea to upgrade your primary OS X volume to 10.10 beta yet. Instead, the safest way is to install OS X Yosemite on a separate hard disk partition, keeping it separate from the primary stable and productive existing OS X experience.
This allows you to check OS X Yosemite and dual boot between OS X 10.10 Beta and OS X 10.9 (or 10.8) without each operating system interacting, and you can safely switch between the two through the reboot process. This also allows you to easily uninstall Yosemite at any point if you wish.
This guide is for those who have access to the OS X Yosemite beta, usually through a developer account.
Prerequisites before starting
- Download OS X Yosemite – To do this, you currently need a Mac developer account, anyone can apply for a dev account and pay if they wish, allowing you to download the OS X Yosemite Dev Preview installer via the Mac app Store
- Check the system requirements to make sure your Mac can run OS X Yosemite, usually if your Mac uses Mavericks, it will run Yosemite.
- At least 25 GB of disk space available to create a separate partition and install Yosemite
- Back up your Mac – edit your hard disk partition table and install beta software. Always back up everything before you do either, the simplest way to do this for most Mac users is to simply use Time Machine and start the backup manually.
After downloading and backing up your Mac, do not proceed with the Yosemite installation yet, you must first create a partition if you want to keep both operating systems separate and double-boot.
Create an OS X Yosemite partition
The first thing you do is partition your Mac hard drive to create a new partition to install on OS X 10.10 Yosemite. This ensures that your primary Mac OS X installation remains separate and stored during Yosemite testing:
- Open the Disk Utility application located under / Applications / Utilities / and select the hard disk from the left menu
- Select the “Partition” tab and then click [+] plus button to create a new partition
- Mark the new partition as obvious, such as “OS X Yosemite,” and then specify a reasonable amount of space on the partition, at least 15GB is needed, but more space is better shared if you plan to use Yosemite frequently (25GB +)
- Select “Apply” to edit the partition table to create a new partition
Exit Disk Utility when you are finished. Now start the installation on the fresh partition.
Install OS X Yosemite on the new partition
Once the full system backup is complete, Yosemite is loaded, and the partition is done, you can now securely install OS X 10.10 on a separate partition, allowing you to maintain your current OS X installation without slowing down the beta software.
- Return to the OS X Yosemite installer and launch it (look for “Install OS X 10.10 Developer Preview” in / Applications /
- Select “OS X Yosemite” (or whatever you named the partition) as the installation location
- Allow the installation to complete, the Mac will automatically start in OS X Yosemite when it is complete
Enjoy OS X Yosemite! Keep in mind that it’s in beta right now, so some things are pretty buggy and not all features are fully implemented yet. However, things evolve with each new release and update, and you can install the updates through the Mac app Store as they become available.
Dual Boot: Switch between OS X 10.10 and OS X 10.9
Now that the installation is complete, you can double-boot between OS X Yosemite and OS X Mavericks (or any OS X you use). The easiest way to do this is by holding down the OPTION button during startup and selecting the partition volume according to the version of OS X to boot. Assuming you tagged the OS X Yosemite section as descriptive enough, it’s easy to choose.
Update: If your Mavericks partition is missing and replaced with OS X Installer, fix it this way!
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FAQ: How to Install OS X Yosemite Beta on a New Partition & Safely Dual Boot
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