If you install a compatible macOS on a new volume of your built-in startup disk, your Mac can start up from either volume. It’s an easy way to use a newer macOS while keeping a previously installed macOS for software that might require it.
Helpful Mac Os Repair information starts here
If you install a compatible macOS on a new volume of your built-in startup disk, your Mac can start up from either volume. It’s an easy way to use a newer macOS while keeping a previously installed macOS for software that might require it.
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