SATA SSDs, if only there were floppy-like docks in PCs’ front panels for them. I see adding one usb-c female adapter as a part of the protective case, and adding a male one on the opposite end of the dock could’ve been the way, since modern USB ports have sufficient power and data capabilities. Adapter’s firmware could’ve signaled it’s nothing more than a big USB thumb drive, it can also be (made?) compatible with portable devices e.g. digital cameras, phones, etc to make it more useful.