Flash Memory
Flash memory is memory which retains its contents even after power is removed.
Flash memory is a form of EAPROM (Electrically Alterable Programmable Read-Only Memory).
Each bit of data in a flash memory device is stored in a transistor called a floating gate. The floating gate can only be accessed though another transistor, the control gate.
The process the control gate uses to access the floating gate is a field emission phenomenon known as Fowler-Nordheim tunneling. Tunneling allows voltage to flow from the control gate to the floating gate through the dielectric layer of oxide which separates them.
Popular flash memory devices include:
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