eMMC

eMMC is the older, cheaper onboard storage found in budget handhelds. It is fine for sequential transfers and perfectly adequate for lighter retro systems, but its weaker random I/O can bottleneck a device running demanding emulation, showing up as longer loads and texture-streaming hitches. It is not disqualifying on a budget retro machine, and a fast microSD card carries much of the library either way — but on a device meant to hit a high ceiling, eMMC is the corner that was cut.