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?

  • Are you sure that your version of Diskmaker X supports MacOS Sierra? Did you get any error messages when creating a bootable drive?
    – Micer
    Nov 21, 2016 at 15:54
  • The latest version of Diskmaker X claim that they support Sierra. I didn't get any error messages.
    – IvyBB
    Nov 22, 2016 at 1:21
  • What if you try different USB drive?
    – Micer
    Nov 22, 2016 at 7:49

2 Answers 2


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!


I would recommend you to try to use another method of creating the bootable USB drive, like another tool Install Disk Creator.

The best option though is not to use any 3rd party tool (you're not sure if it supports the latest version of MacOS) and use terminal instead. Official documentation is here and you can find a more detailed guide for example on this website.

  • I tried before. Still cant.
    – IvyBB
    Nov 21, 2016 at 16:29

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