Mac mini m2 cannot be added with a solid state drive. Since the solid-state drive of the mac mini m2 is directly welded to the motherboard, it is not possible to increase storage space for the mac mini m2 by replacing the solid-state drive. If you want to add a solid-state drive to mac mini m2 to expand storage space, you can use an external M.2 solid-state drive. The Thunderbolt 4 interface of mac mini m2 has a maximum speed of 40Gb/s. When connected to an external M.2 solid-state drive, the read and write speed is not slow, which can meet the storage needs.

　1. The solid-state drive of mac mini m2 is welded and integrated with the motherboard. The solid-state drive cannot be replaced or installed. If you want to add a solid state drive to mac mini m2, you can use an external hard drive box.

2. The Thunderbolt 4 interface of mac mini m2 supports a maximum speed of 40Gb/s, and the speed of external solid-state drives is also good, enough to meet storage and usage needs. Prepare an M.2 NVMe hard drive enclosure and M.2 solid-state drive, install the solid-state drive into the hard drive enclosure, and connect it to the Thunderbolt 4 interface of mac mini m2 through a data cable to use.

3. The speed of the mac mini m2 external solid-state drive depends on the speed supported by the hard drive box and the quality of the M.2 solid-state drive itself. The advantage of an external M.2 hard drive is that it is cost-effective. After all, upgrading the mac mini m2 from 256GB to 512GB costs an additional 1,500 yuan. The disadvantage is that you need to drag a hard drive box with you anytime and anywhere.