How to Create an External El Cap Startup Drive?


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Hi All;

I need to create a USB drive with El Cap on it that I can start up other Macs with (I DO NOT want to create an installer drive; that I can do). I have a number of older macs that occasionally I need to start up from an external USB (preferred) stick so I can get unbacked up files off of before I do reinstalls of OS, etc. I have searched but not found instructions. Eventually, I would like to do this for other OS's so I can do test drives before installing them.

Please, any help is greatly appreciated!

Carl
 
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1. Format your external device.
2. open the El Capitan installer.
3. Continue through the install process and accept the licence agreement.
4. Click on 'Show all disks'
5. Choose your external drive.
6. Click install.

When the install is complete, you can use the boot with option key pressed, to choose your required boot device.
 

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