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It has flash memory chip(just like EEPROM). It has memory cells which are made up of floating(coated with electrical insulators) gate transistors. These cells have value of either 1 or 0 depending on voltage (like 5v=1 and 0v=0). In this way all cells are assigned values and binary code is made. This is how it stores data.
microSD is a kind of removable flash memory card used for storing information. SD is an abbreviation of Secure Digital. An SD card is a solid-state device. This means it has no moving parts in order to function. Inside the SD card is circuitry that includes flash memory. Flash memory is a type of EEPROM chip as mentioned in #2. It has a grid of columns and rows with a cell that has two transistors at each intersection. The two transistors are separated from each other by a thin oxide layer. One of the transistors is known as a floating gate, and the other one is the control gate. The floating gate's only link to the row, or wordline, is through the control gate.
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