There are typically four parts to a flash drive:
Male type-A USB connector – provides an interface to the host computer.
USB mass storage controller – implements the USB host controller. The controller contains a small microcontroller with a small amount of on-chip ROM and RAM.
NAND flash memory chip – stores data. NAND flash is typically also used in digital cameras.
Crystal oscillator – produces the device's main 12 MHz clock signal and controls the device's data output through a phase-locked loop.
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