zlacker

UHS SD can be fast in consecutive read and writes but I've rarely seen good performance in random I/O or lots of small actions.

>>vel0ci+(OP)
It doesn't have to be that way. Its entirely feasible to make a microsd card with a better controller and some ram buffer for fast wear leveling. The best we see today is some mild tuning for IO in A1 and A2 cards.

You have to remember that a current microsd cards is just a general purpose micro-controller and some (probably SPI) flash in a plastic case.

>>blkhaw+Ee
It doesn't have to, but it is, and an effort like this is going to be off-the-shelf if it ever exists at all.