With the release of Mac OS 10.10 Yosemite earlier this week, I wanted to share a fast and easy way to create a bootable volume from which you can install Yosemite (that can be a harddrive or a usb key).
- Download Yosemite from the Mac App Store.
- Plug in your external disk/volume and make sure it’s either empty or can be formatted in the next step.
- Open terminal.app and enter the following command:
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/*your volume here*/ --applicationpath /Applications/Install\ OS\ X\ Yosemite.app
This will convert your volume install a bootable installer based on the application path you provided, which is the Yosemite “app” in this case
- Enter your administrator password,
- You’ll be prompted to confirm that the volume can be erase, press ‘y’,
- And done.
Now connect the drive to machine you want to upgrade/reinstall, boot it up while holding the ‘c’ key and select the “Install 10.10. Yosemite” volume.