at first open the case of the pen drive..plug it into usb port on your computer..use a metal or something conductive and touch the pin 6 to 8 at your flash ic chip(may different related to your pendrive model).you can counting the pin by referring the notch of flash chip.the a little electric spark will come up when you do that.unplug your pendrive,plug it back to your usb port and a format it again.This step usually will clear the data in flash ic chip..
Xiten_0001, September 2007