If you’ve looked into how much storage space to keep unused on an SSD, you likely came across recommendations ranging from 0 to 50 percent and may be frustrated about how to sort out the right number.

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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.