Yes, you can expand the 2 TB memory with an additional M.2 SSD that was already used in an old PS5. Such SSDs are directly compatible and can be installed without preparation - installed games are retained and are immediately available. Pay attention to the specifications such as M.2 NVMe PCIe Gen4x4, sizes from 250 GB to 8 TB and a maximum width of 25 mm with cooling. After installation, you must format the SSD in the settings and can move games to it.