The traditional method of creating a bootable OS X USB installer no longer works, so you’ll need to follow a new approach when dealing with OS X Yosemite. While there are multiple methods that will work, here’s the easiest way to create a bootable OS X 10.10 Yosemite USB Installer for the Yosemite Public Beta.

1. Step 2: Make the Drive a Yosemite Boot Installer. In a single command you'll create the bootable install drive. To do this, launch Terminal and enter the following command. Note, this assumes that you haven't moved the installer out of your Applications folder. If you have, simply replace '/Applications' with the location of the.
2. Oct 18, 2014 8GB or ‘Greater’ USB ‘Install OS X Yosemite.zip’ file downloaded from Mac Store (Download from here) Now, let’s move to the actual tutorial to create bootable OS X Yosemite USB, Connect your USB drive with Mac.

Click on this link.

Go to Section 4 and click on Download OS X Yosemite.

This downloads InstallMacOSX.dmg to your Downloads folder.

The next section can only be done on a mac that is capable of running Yosemite,

a mac that came preinstalled with an OS later than Yosemite will refuse to do the next bit.

When downloaded open to InstallMacOSX.pkg, double-click on

that and an installation window will open, this does not install Yosemite

but converts the InstallMacOSX.pkg to the Install OS X Yosemite.app which

you will find in your Applications folder.

(If the installation window asks which disk you want to install to, you must pick

the disk that you are booted to at the time. Not any internal or external disk that

you want to eventually install Yosemite on, that is for later.)

To start the installation of Yosemite double click on the Install OS X Yosemite.app.

The copy of the install app self deletes after installing Yosemite, so make sure you keep a copy of the InstallMacOSX.dmg if you need it in future, or you could just make a copy of the Install OS X Yosemite.app

prior to installing and moving it to an external drive for safe keeping. It is also possible to create a bootable USB installer disk using the Install OS X Yosemite.app in the Applications folder and the createinstallmedia command in the Terminal app.

Read the instructions here,

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Sep 11, 2020 1:36 AM