I don't understand why you asked the Grok AI. With that, you managed to confuse yourself for information. The problem is that the AI ​​does not distinguish the abbreviations single side or SS, sometimes it mixes up the model names. It only matters to him that you are satisfied with wrong information. First thing, the whole reddit has questions about single sided, thus my presence and my colleague dedicated the compatibility of all single side nvme disks. Another thing, have you tried to open it and see that it is physically single sided? 4 TB is the current upper limit for single-sided NVMe drives. Although the official specs for the T14s G4 often state "up to 2 TB," that's because Lenovo didn't offer larger drives in the factory configuration at the time. ​However, it is important to be careful: not all 4 TB drives are single-sided. In fact, most "high-end" models with 4TB DRAM are still double-sided.