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Re-installing my OS to an external SSD

A few months ago I changed my operating HD from my Imac to an external SSD. During a recent update of OS my IMAC has reverted back to a very slow onboard HD. How can I re-install the OS from my internal slow HD back to my external SSD

Posted on Mar 25, 2022 2:20 AM

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Posted on Mar 25, 2022 4:05 AM

You need to specify the startup disk: System Preferences > Startup Disk. Likely the external disk was untouched.


If you wish to upgrade the external disk, be operating from it and start the upgrade process.

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Re-installing my OS to an external SSD

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