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Who can tell me the difference between m2 memory card and SD card?

M2 is Sony's own standard and has been discontinued. Sony now supports sd cards and microsd cards across the board. Another notable difference is capacity. The sd card has now reached 1TB, and the largest m2 card is 16GB, not to mention reading and writing. The latest uhs2 standard SD card has a reading and writing speed of 260MB per second, with a maximum of more than ten MB.