- Apr 23, 2021 There are a few reasons why you might want to reinstall macOS (or even Mac OS X). Perhaps your Mac is working erratically and you think that a clean install of the operating system might fix the. Blank hard drive - Find a USB external hard drive that holds at least 100 gigabytes (this is where you'll install your macOS stuff, so the bigger, the.
- Jun 07, 2021 Now to install the beta or alternative version of the Mac operating system on your external drive. Open a finder window, go to Applications and find the Catalina or Big Sur installer (or whichever.
I would like to install El Capitan on a Sandisk 128 GB Extreme Pro flash drive to use an alternate startup disk for my Mac Pro or MacBook Pro. I have found instructions online to make an El Capitan Installer out of the flash drive but the only thing you can do with it after that is to use it to install OS X on other drives. You can't startup and run from it like you would your primary startup drive.
I have the 6.2 GB 'Install OS X El Capitan.app' and 'InstallMacOSX.dmg' on a couple of the three HDDs I have in my Mac Pro, but I have not been able to figure out how to install a copy of El Capitan (which is the OS I am using) onto the Sandisk.
With that out of the way, follow the steps below on how you can clean install OS X El Capitan on your Mac. Create a bootable OS X El Capitan USB flash drive. Follow our tutorial posted here on.
Any help would be appreciated.
Install Os X El Capitan On External Drive
Posted on Feb 14, 2020 12:51 PM