<Tr> <Th> </Th> <Td> Flash memory chip </Td> </Tr> <Tr> <Th> 5 </Th> <Td> Crystal oscillator </Td> </Tr> <Tr> <Th> 6 </Th> <Td> LED (Optional) </Td> </Tr> <Tr> <Th> 7 </Th> <Td> Write - protect switch (Optional) </Td> </Tr>

When did usb flash drives replace floppy disks