Types of Flash Memory
- NAND flash memory: NAND flash memory has high memory cell density so it has high capacity to store the data. Memory cards, USB drives, and SSD (Solid State Drive) use this type of flash memory which uses low power to store data, it has low power consumption. NAND flash memory cell is made up of two gates.
- Control gate
- Floating gate
- NOR flash memory: NOR Flash Memory is made up of FGMOS or FGMOSFETs (Floating Gate Metal Oxide Field Effect Transistors). FGMOS is an electronic component in NOR flash memory that can contain 0 or 1. So we can say that the memory cell in the NOR flash memory is FGMOS. Cells of NOR flash memory are attached in a parallel manner so reading speed of this type of flash memory is faster compared to other.
- 3D flash memory: It is a newer type of flash memory. It has a memory cell density greater than NAND flash memory also. It is used in high capacity SSDs.
What is Flash Memory?
Flash memory is secondary memory and so it is not volatile which means it persists the data even if there is not an electrical supply provided. This flash memory works on the principle of EEPROM. EEPROM stands for Electrical Erasable Programmable Read-Only Memory. ROM operation can only one time write and many times read and we can’t erase it. But Flash Memory can be erased multiple times and update the data or program integrated into it. So it gives flexibility to the updation of the program but ROM has no such type of feature.