is there such a thing as an ephemeral SD card that is backed by RAM rather than flash memory? that is to say, non-persistent storage, useful only as a "ramdisk" of sorts for temporary files and/or swap. i guess this applies to anything that can be wired up to the same pins, so something SDIO but not necessarily the form factor of a (micro)SD would be fair game. i ask because this would be super useful for swap on a lot of RAM-limited systems where you don't wanna worry about flash write cycles.
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