Not sure what your question is - are you saying your USB Floppy Drive is not working on your PC? That's usually a BIOS issue.
I want to say that USB Pendrive or harddrive in which i had kept SDB file. I have to use CD for the safetech authentication.
In many machines we are facing the issue.
use a USB floppy then, every BIOS seems to support that just fine. Or use a WinPE/BartPE version of WinTech?