Whenever you want to switch from Mavericks to Yosemite, just restart while holding down the Option (Alt) key and select which one you want to boot. #BOOT INTO DISK UTILITY MAC YOSEMITE INSTALL#Since this is a beta build of Yosemite, I would skip it and install all of the third-party apps you want to play around with directly from Yosemite. I would recommend not using Migration Assistant to transfer files over from your Mavericks installation, as this will just duplicate everything. Once it's done installing, you'll get to the Welcome screen, and you should be able to figure it out from there. Alternatively, you can just hold down the C button while starting up to boot directly into the USB drive.Ĭhoose your new partition on the "Install OS X" screen. Wait until the Startup Manager pops up, then select your new OS X Base System volume. If you are using the bootable drive, restart your computer while holding the Option (Alt) key. If you're not using a bootable install USB drive of Yosemite, just head to your Applications folder and double-click on the Install OS X 10.10 file. #BOOT INTO DISK UTILITY MAC YOSEMITE MAC OS X#Step 2: Open the Mac OS X 10.10 Installer File If you have a really large hard drive, you can also partition it using the guide above, if you don't want to devote the whole thing to Yosemite. It won't be as fast as your internal disk, but for a beta, it should be perfectly acceptable. You can disable FileVault and delete those other partitions and try again, but you're probably better off installing your Yosemite OS on a USB hard drive (preferably USB 3.0 or Thunderbolt compatible). If you already have a second partition, either created by Disk Utility or Boot Camp, or if you're encrypting your disk with FileVault, you may not be able to create a new partition. 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. #BOOT INTO DISK UTILITY MAC YOSEMITE HOW TO#
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