USB installer

Build bootable OS X Yosemite USB install media.

Ref: https://support.apple.com/en-us/HT201372

Format USB media

In Disk Utility, Erase the stick:

• Volume: Yosemite
• Format: Journaled

Install

Caution: createinstallmedia erases /Volumes/<Volume> and needs sudo.

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

--volume is the target volume. --applicationpath is the Install OS X Yosemite app. --nointeraction runs with no interaction.

The run looks like:

Ready to start.
To continue we need to erase the disk at /Volumes/Yosemite/.
If you wish to continue type (Y) then press return: y
Erasing Disk: 0%... 10%... 20%... 30%...100%...
Copying installer files to disk...
Copy complete.
Making disk bootable...
Copying boot files...
Copy complete.
Done.