I'm not seeing nearly enough discussion about this: In addition to the standard M.2 2280, it also supports 2242, 2260 and 22110 and I'm curious as to why. It could be useful if you want to run a server grade SSD but those aren't exactly cheap. Sony simply could have left things at the "standard" 2280 (22 mm in width, 80 mm in length) and called it a day as that's what the majority of consumer NVMe drives will be. Maybe Sony has plans for partnered SSDs? I dunno but I'm very interested.