Haven't had much luck searching for this; the terms are too commonly used in things other than what I'm looking for.
Has anyone tried to emulate an SD-card, as in, some hardware you plug into an sd-card socket that acts like a physical sd-card, but is backed by some other storage (hard drive, ram, another computer, etc)?
Back in the day, EEPROM emulators that were RAM-backed were popular, this would be a modern equivalent.
And no, it's not critical, mostly just a curiosity as I try to squeeze the most performance out of an embedded board.