The M4 Mac mini came with a surprise a slotted and upgradeable SSD. Here's how to install one, get it running, and what to expect for speed.An upgrade SSD on top of the M4 Mac miniMac mini upgradeability has varied over the years. The 2012 and before models were the gold standard, with both upgradeable RAM and storage. The 2014 model had upgradeable storage, but not RAM. The 2018 had RAM slots, but lacked upgradeable storage.When the M1 mini shipped, nothing was upgradeable. And while Apple doesn't strictly approve of SSD upgrades on the M4 Mac mini, it's at least possible. Continue Reading on AppleInsider | Discuss on our Forums