How to Create a Bootable USB for Yosemite (Mac OS X 10.10)

In order to create a bootable USB with OS X Yosemite (10.10), you need to use an 8 GB+ USB storage device.

Step 1

Download "Install OS X Yosemite.app" from App Store.

Step 2

Open Disk Utils and create one HFS+ Partition on the USB called "Install." On the Partition options select GUID.

Step 3

Open "Terminal" and paste the following command:

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sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Install --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

Enter "admin password" and wait a few minutes, until you see:

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Erasing Disk: 0%... 10%... 20%... 30%...100%...
Copying installer files to disk...
Copy complete.
Making disk bootable...
Copying boot files...
Copy complete.
Done.

This is a fast option, and it does not provide too much feedback. If you want to use a graphical interface, you can use DiskMakerX. (4.0 Beta 3 or newer).

Follow Steps 1 and 2, after that just run the program, select 10.10, "Install OS X Yosemite.app" and wait for the program to finish.

Depending on your USB device, the process could take 5 to 15 minutes. A USB 3.0 drive is recommended.

Once you're there, you have only a few more things to do in order to start the installation of your new Yosemite OS X version. Simply plug in your bootable USB drive, reboot the system and press the Option key during the booting process. Select the USB drive as a boot source and the installation process should start. Follow the on-screen instructions and you should be good to go.

How to Create a Bootable USB for Yosemite (Mac OS X 10.10)

Create a bootable USB with Yosemite for emergency

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