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. It may take long time depending upon your Mac to start booting with macOS Mojave.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.You will see macOS Recovery app and choose “Install macOS” option from Utilities.Double click on your USB that contains the macOS installer or highlight it and press the return key.Remember, you need to have an internet connection for installing from USB as the installer needs to get updates for your Mac from Apple’s server. Select your Wi-Fi network name from the “Choose Network…” dropdown and enter the password to connect to internet.If you only see “Macintosh HD” like below then the USB drive is not connected to your Mac or not created properly with the installer file.

Note that the Startup Manager will only list volumes that include bootable volumes.The Startup Manager scans and lists the drives that are connected and bootable.When your Mac restarts, press and hold the Option key till “Startup Manager” opens.Insert the bootable USB installer drive and go to “Apple Menu > Restart”.Follow the below process to boot your Mac from bootable USB:

Boot into disk utility mac yosemite