1, SD card: It is a new generation storage device based on semiconductor flash memory.

2.MMC card: Siemens and Sandisk launched on 1997.

Second, the characteristics are different.

1, SD card: small size, fast data transmission, hot swap, etc. Widely used in portable devices, such as digital cameras, tablet computers and multimedia players.

2.MMC card: advanced packaging technology, 7 pins, small size, light weight, very suitable for mobile storage.

Third, the advantages are different.

1, SD card: It can ensure the security of digital file transmission and is easy to reformat, so it is widely used.

2.MMC card: supports 1bit mode, 20MHz clock and adopts bus structure.

Baidu encyclopedia -SD card

Baidu encyclopedia -MMC memory stick