The Mac Studio might be upgradable, according to a Max Tech teardown

The first Mac Studios have been released into the wild, and as is customary, the first teardown has appear on the YouTube. Max Tech, has disassembled the Mac Studio to disclose the interior design, the M1 Ultra, and a possible hint at upgradeability.

This teardown demonstrates how to gain access to the Mac Studio. The Mac Studio looks to have no screws from the exterior, but if you carefully remove the rubber ring from the machine's base, you'll find four screws that allow you to remove the entire base. When he removed the Mac Studio's base and examines the internals, he finds that the Mac Studio could have upgradeable SSD storage. The Mac Studio, just like the Mac Pro, has two SSD connectors on the inside that are easily accessible.

According to Max Tech, Apple's website for the Mac Studio states that the storage is "not user accessible" and that consumers should "consider setting to a greater capacity" if they think they might require more storage in the future. Because of the “user accessible” language. He speculates that Apple could offer authorized SSD storage upgrades at some point down the line. Apple similarly sells an SSD Upgrade Kit for the Mac Pro.

The video also shows how you can move the SSD module from one slot to other. This again suggests that the slots could be modular and upgradeable down the line. There is zero chance you’ll be able to upgrade the unified memory of the Mac Studio because it is soldered to the chip itself.