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Bootable USB drive with El Capitan will not boot.

I have a 2017 21.5" iMac that I want to create another partition and install El Capitan on to use some older software that I do still use, but rather infrequently.


I followed the directions in "How to create a bootable installer for macOS" and it created the bootable USB drive fine, with no errors, but when I restart the iMac and hold the option key down after I hear the startup chime in can navigate over to the El Capitan USB drive and when I click on it I get a circle with a line thru it.


I have created the USB drive 3 times using different downloads of the "Install OS X El Capitan" app and I get the same thing each time I try.


What could be the issue?


Thanks in advance;


Steve

iMac 21.5″, macOS 11.2

Posted on Jun 12, 2021 4:46 PM

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3 replies

Jun 12, 2021 5:24 PM in response to t.moe

Yes, El Capitan was released in 2015, but when I first got this IMac I had I set up the way I’m taking about.

the current OS on one partition and El Capitan on another.

I think I had a time machine back up that I restored to that partition.

I know I had it set up this way because I was still s

using FCP 7 to finish up some projects.

I then removed the partition because I didn’t think I needed it any more, but I now have to revisit a couple of this FCP projects.

Bootable USB drive with El Capitan will not boot.

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