Effectively, partitioning gives you two computers in one. Partitioning is basically a way to divide your hard drive into separate containers that don’t really interact with each other and can coexist without any interference. So you could have a beta version of a new macOS running alongside your stable one, or even a completely different operating system like Windows. The most common reason for trying to partition Mac hardrive has always been the ability to install two operating systems on the same computer at once.
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