3 ms·

eMMC is not at all better then SD card though. You really need a real SSD for industrial applications.

• jrockway 7y ago
  It really depends, I think. If you are accessing the eMMC at the lowest hardware level, then you can write OS/filesystem-level code to maintain consistency when power is lost. Meanwhile, an SSD, like the SD card, is doing a bunch of internal operations that the OS can't control, so it's up to the hardware to maintain data integrity. I imagine that SSDs include a capacitor large enough to finish housekeeping, or use integrity-preserving operations internally (journal, etc.), but micro SD cards don't.
  • vvanders 7y ago
    There's a lot more to preserving eMMC than just handling power losses. A lot of what proper SSDs is to do the right wear leveling to make sure that damaged flash blocks don't cause corruption. eMMC is a pretty broad term that can cover something that's just a soldered SD card to something with a full-blown wear leveling controller. That's why you still see a lot of eMMC failures in embedded systems when someone forgets to not log to the persistent storage or similar wear heavy operations.