Flash memory is a type of nonvolatile memory that erases data in units called blocks. A block stored on a flash memory chip must be erased before data can be written, or programmed, to the microchip.
Flash memory retains data for an extended period of time whether a flash-equipped device is powered on or off.
Flash works using an entirely different kind of transistor that stays switched on (or switched off) even when the power is turned off.
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