Partition Mojave HD to run Sierra

Started 5 months ago | Discussions thread
silentstorm Senior Member • Posts: 1,486
Easiest method

If your laptop is really the old 17", just removed the drive and buy a new SSD SATA drive.

Put in the new SSD drive and plug in the Sierra installer USB.  Install should be a breeze from here.

Get an external enclosure for the Mojave drive.  Use it as an external boot drive if u need to use Mojave OS.

This is by far the simplest and easiest method for getting back Sierra OS & no need to reinstall everything again in Mojave.

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