So, first a small hint regarding the 120 GB partition on the 1 TB M.2: From meer technical side you wouldn't have to create a separate partition. DrivePool doesn't mind if you assign it a fresh and clean or old and used partition. It will "live" in just some hidden, ordinary folders in the root of the volume, without harming existing data in any way. Regarding the optimal SSD size, well... You have to understand that SSD Optimizer isn't a transparent cache like PrimoCache is (some us