Open up Disk Utility on your Mac, and in the left section, select the hard drive that your main OS partition is installed on. To play it safe, I would recommend making your second partition at least 20 GB large (I chose 50 GB).Īlso, you may want to make a bootable install USB drive of Yosemite just in case you need to try again, or want to install it on another one of your computers without downloading the install file again from the Mac App Store. It's also stated that Yosemite only needs 8 GB of available storage, but in my case, after installing Yosemite on my second partition, it reads just over 13 GB used.

Don't Miss: How to Dual Boot Yosemite 10.10 & El Capitan 10.11Īpple has stated that the requirements to run Yosemite are pretty much the same as with Mavericks, so if you're currently running Mavericks, you should be set to install Yosemite, too.

Plus, you're free to uninstall Yosemite at any time without ruining your Mavericks partition, and you can even give that Yosemite partition's space back to Mavericks if need be. Installing the Yosemite beta on a separate partition means your 10.9 Mavericks partition will be safe and sound, and that you won't have to use Yosemite as your primary operating system. There have been many reported bugs and even blank gray screens that prevent access to the system, so if you install over your current OS, you're risking having to boot into recovery or reinstall from the ground up. For those of you who've already gotten Beta Preview or Developer Preview access to Mac OS X 10.10 Yosemite, I highly recommend installing it on a separate partition on your hard drive.

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