Mac mini M6 and M5 Pro: SSD is soldered again and can no longer be expanded

Apple never sold this upgrade as an official feature, but the modular design of the Mac mini M4 opened a business avenue for manufacturers like Expand Mac mini, which marketed replacement modules to expand capacity after purchase. Let's see what changes with the M6 ​​and the M5 Pro: the company itself assures that its current kits are not compatible with the new boards, and at the moment there is no equivalent alternative on the market. It is a third-party physical inspection, not an official announcement from Apple about the end of updates, so in theory a component-level repair in a specialized workshop is not ruled out. For those who buy the computer under normal conditions, however, the difference is practical: there is no internal upgrade path that you can plan with guarantees, and the M4 generation modules are useless in the 2026 models.

Starting capabilities and why they matter more than ever

Mac mini M6 boots into 256GB of internal storage, while the M5 Pro starts directly at 512GBaccording to the specifications that Apple publishes for both models. The difference is not just space: sequential speed tests carried out by third parties place the M6's 256 GB unit around the 3000MB/sin front of the 6400-6600MB/s which reaches the 512 GB version under its own testing conditions.

That gap in performance does not mean that all your applications will run twice as fast with more capacity, but it should be taken into account if the Mac mini is going to be your main computer for several years. With the internal update ruled out, for an M6 intended as a regular work computer, 512 GB is the most reasonable starting point. The 256 GB model is still valid for light use, in the cloud or as a secondary device, as long as you assume from day one that you will need external storage to complement it.

External storage expands space, but does not replace the internal SSD

An external SSD connected by Thunderbolt can solve much of the space problem, although it is not equivalent to a physical upgrade to the integrated NAND. The M6 ​​has three ports Thunderbolt 4 on the back, and the M5 Pro makes the jump to three ports Thunderbolt 5according to Apple specifications. There you can move Photos libraries, video project folders, or files that you don't always need to have on the internal drive: Apple documents both moving the Photos library to an external drive and the possibility of installing macOS on an external drive as a boot drive.

This last option adds complexity and should not be treated as a substitute for the speed of the internal SSD. And there is an important nuance: an external drive expands your workspace, but it is not a backup on its own. If you save files that only exist on that external drive, you still need a copy somewhere else, especially if they are projects you can't afford to lose.

If you already have the 256GB Mac mini M6, here's what you can do

There is no need to change equipment just because the storage is welded. The first thing is to check how much space your daily work actually takes up: if you can move large libraries and projects to a quality external SSD, keep enough free space on the internal drive for macOS updates and active use, and make sure you have a separate backup.

If you're still within the return window and already know that 256GB will fall short for your core workflow, compare the cost of changing the configuration now versus setting up the external solution you would otherwise need. In any case, do not buy an internal module designed for the M4 or M4 Pro: it does not fit the M6 ​​or M5 Pro, and an external SSD enclosure, no matter how fast, is not a substitute for the board's integrated storage.