In the volume of 24mm×32mm×2. 1mm, the SD card combines SanDisk flash memory card control with MLC (multilevel cell) technology and Toshiba's 0. 16u and 0. 13u NAND technology.
It is connected to a special driver through a 9-pin interface, and no extra power is needed to keep the information stored on it. Moreover, it is an integrated solid medium without any moving parts, so there is no need to worry about the damage of mechanical movement.
Extended data:
Structure:
In addition to retaining 7 pins of MMC card, the SD card interface also adds 2 pins on both sides as data lines.
In the SD card 3.0 specification, the theoretical maximum capacity of SD card can reach 2TB, and the theoretical maximum reading and writing speed can reach 104MB/s (in the latest 4. 10 specification, the theoretical maximum reading and writing speed has been increased to 3 12MB/s).
SD card is mainly composed of four parts: external pin, internal register, interface controller and internal storage medium.
Baidu encyclopedia -SD card