What is UHS-I/UHS-II？

UHS-I/UHS-II (Ultra High Speed-I/Ultra High Speed-II). UHS-I and UHS-II are SD card interface standards that define data transfer speeds. UHS-I supports speeds up to 104 MB/s, while UHS-II can reach 312 MB/s using additional pins.

Simply Put:

Think of UHS-I and UHS-II as highways for data. UHS-I is like a four-lane road, fast enough for most everyday needs. UHS-II, on the other hand, is an eight-lane expressway with dedicated fast lanes and smarter traffic control, allowing data to move much faster and more efficiently. Compared to its predecessor, UHS-II can transfer significantly more data in less time.