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I'Ve looked through so many other forum posts, and whilst this seems to work for almost everybody else, it continues to fail for me. terminal then saysĬouldnt mount dmg /Volumes/ Install OS X Yosemite/Install OS X Yosemite.app/Contents/SharedSupport/InstallESD.dmg (error code 112)Mount of outer dmg failed. The last one I've just done took 56minutes to copy. It then goes through and erases the sub disk, but when it gets to copying files, it takes ages. Sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -application path /Applications/Install\ OS\ X\ Yosemite.app -nointernaction

I Downloaded the Yosemite 10.10.5 installer and formatted a 16gb usb drive as Untitled, with 1 partition, and a GUID table. Im running Mavericks 10.9.5 on a 17" MBP.