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Take Control of Your Digital Storage by Jeff Carlson

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Format and Partition Disks

I’m a terrible handyman, and yet even I know that if you start a project on shaky ground or incorrect measurements, you’ll wind up with cascading problems later.

So when we look at managing the data on a hard disk or SSD, we need to start at the base layer and work upward from there. The filesystem that undergirds macOS is an invisible, but essential, component of the operating system that controls how and where data is written on the sectors on a spinning platter or in the cells of a solid-state memory chip. For years, the filesystem wasn’t anything most people had to think about, but with the arrival of macOS High Sierra in 2017, the default Mac filesystem changed from Mac OS Extended to APFS (Apple File System) ...

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