The M4 Mac mini came with a surprise — a slotted and upgradeable SSD. Here's how to install one, get it running, what to expect for speed, and what's happened in the last eight months since upgrading.

Installing an SSD is one of the most straightforward upgrades you can do to your PC — the only one with fewer steps is installing new memory. That makes it a great way to try out upgrading your PC by ...