Yosemite bootable install disc only half recognized

Hello

I am in the process of upgrading to 10.8.5 Yosemite and created a bootable Yosemite installation on a 100 G SSD drive connected via USB.

The drive will appear under the "Startup disk" in "system settings" (sorry if these names are not quite correct because I use a Japanese version), and I can choose the drive so I guess that the disk must be blessed, but when I reboot, the Mac restarts on its built-in hard drive.

I tried to restart while pressing the option key, but this time the installation of Yosemite drive not even will appear.

Does anyone have an idea of what might happen and how do I fix?

Thank you!

You will have to redo the external hard drive, because the operating system on it is not recognised as bootable. How did you create the disk external bootable?

Tags: Mac OS & System Software

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