The USB flash drive is a serial memory device.  Its serial interface
follows the USB serial specification, which is non trivial to
implement (it's not like an rs-232, spi, i2c, or other 'trivial'
serial bus).

Typcially the memory chips used inside the flash drives are parallel
memory devices.  typically they are nand flash, 8 bit wide.

I hope this helps.

-Adam

On 5/31/06, changhp <changhp@hotmail.com> wrote:
>
> Is the USB FLash Memory Drive a Serial memory device or a Parallel Memory
> device?
>
> Thank you very much
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