Apple - Problems creating Yosemite USB bootable drive

Change

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled 2 --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

to

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume "/Volumes/Untitled 2" --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

or

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled\ 2 --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

and it should work.

You have to escape spaces in paths in the command line either with a \ or quotation marks.

Use this path instead:

/Volumes/Untitled\ 2/

The backslash tells the terminal that the space is included in the path, otherwise it thinks your volume is called /Volumes/Untitled and that there is a random 2 argument in the command.