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Originally Posted by frankmehta  i dont think pen drives have any firmware. |
How do you think it behaves as a pen-drive (intelligent communication over a serial link)? Pen-drive firmware is mask-programmed and not visible to the external world by any means. It is not dumb media like a CD or floppy disk where a random location can be individually located and read directly by the reader. It is an active device with communicates with the PC over the USB with a serial protocol. When the PC requests for bytes from a file, the pen-drive responds with the bytes. Ditto for writing, except it writes those bytes into its flash appropriately. The flash in the pen-drive is not accessed by the PC directly like RAM/ROM on the motherboard.