You can make a difference in the Apple Support Community!
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
I am booted off one drive in El Capitan, I download:
https://support.apple.com/en-us/HT208202
And I still can only install Sierra on the drive I'm booted off of, not a secondary external drive I formatted HFS+ Journaled.
The internal drive is about to fail, so I need to create a secondary boot drive. Is there any reason this is happening?
The computer is an early 2015 MacBook Air.
So from the page you linked to you downloaded the InstallOS.dmg.
Opening the InstallOS.dmg you would have got InstallOS.pkg.
Double-clicking on the InstallOS.pkg will open an Installation window.
This does not install Sierra but merely creates the Install macOS Sierra.app in your
Applications folder, the means you have to point the installer to the disk you are
booted up to.
When you start the installation from the Install macOS Sierra.app you
can then select the external drive to install Sierra on to.
So from the page you linked to you downloaded the InstallOS.dmg.
Opening the InstallOS.dmg you would have got InstallOS.pkg.
Double-clicking on the InstallOS.pkg will open an Installation window.
This does not install Sierra but merely creates the Install macOS Sierra.app in your
Applications folder, the means you have to point the installer to the disk you are
booted up to.
When you start the installation from the Install macOS Sierra.app you
can then select the external drive to install Sierra on to.
Hmmm, never heard of this, can you clone it?
Carbon Copy Cloner...
http://www.bombich.com/software/ccc.html
There's also...
Sierra download won't install on an external drive, only installs on boot drive
