Bootable system
Running MacBook Pro Touch, Mojave 10.14.6
How can a create a bootable system on an external hard drive…
MacBook Pro 15", macOS 10.13
Running MacBook Pro Touch, Mojave 10.14.6
How can a create a bootable system on an external hard drive…
MacBook Pro 15", macOS 10.13
Depending on exactly what you’re up to: How to create a bootable installer for macOS - Apple Support
Depending on exactly what you’re up to: How to create a bootable installer for macOS - Apple Support
Run the OS installer and choose the external drive, or use the Disk Utility or a product such as Carbon Copy Cloner to duplicate an existing system to it.
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Bootable system