MacOS – Cannot boot from usb

bootfusion-drivemacbook promacosusb

Recently I replaced the optical drive to SSD to make a fusion drive in my Macbook Pro 13 inch 2012. The hardware installation was successful and it is recognized in Disk Utility. I made a Sierra bootable drive on my 8GB USB drive with DiskMaker X.

The problem is I can't see the USB drive in the boot manager (press option when power up). I'm sure that the USB port in my mac is working. I can see my Time Machine drive in the boot manager and my USB drive after the boot from the original HDD with sierra.
I can't make a fusion drive when I can't boot from USB. What can I do?

Best Answer

Try creating the USB Installer via Terminal.app

  1. Download Sierra from the Mac App Store and leave it in your Applications Folder
  2. Reformat your USB stick to HFS+ Journaled and name it Untitled

  3. From Terminal copy and paste this 

    sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app

That's it!

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