On the storage, we use Western Digital SN730 and SN740 drives, which are also what we put in the pre-built Framework Laptops. These are roughly equivalent to the SN750 and SN770 retail drives, respectively.
On the memory and storage, ChromeOS technically has an allow-list for memory and storage, though in practice we have seen modules not on the list work fine. We'll be adding that list onto the Knowledge Base. We will be making parts that are on the list available in the Framework Marketplace for guaranteed compatibility (the memory we already have, and we'll be introducing SN730/SN740 storage up to 1TB).
