about UsbStor.

I read the tutor written by dazzy.
I have some questions:
1.
dazzy\'s driver -> M$\'s usbstor.sys -> usbd.sys
                      or
dazzy\'s driver -> usbd.sys
what is right?
2.Is it work on 98?
if 2==true,then only need one driver - dazzy\'s driver?
(becuase I ever c some products that have 2 drivers.)

thx