There are two SSD sockets within the Framework Laptop 16. The primary socket is compatible with M.2 2280-sized NVMe SSDs while the secondary socket is compatible with M.2 2230-sized NVMe SSDs. 

We have drives from 250GB up to 4TB available in the Framework Marketplace. There are also drives ranging from 128GB to 8TB available elsewhere. While drives from other brands should work, we've focused our compatibility testing on Western Digital's SN740 and SN810 SSDs.