Thanks for the help! Adding USB\Vid_08bd&Pid_1100&Rev_0000 did the trick for me.....saved my a**! XP txtsetup.sif contain some USB floppy Hardware ID's VID_*&PID_* . Some USB floppy drives are missing. In addtition there are some usbstor Compatible ID's already. USB\Class_08&SubClass_04&Prot_00 is missing. Hence the txtsetup.oem addon. What about: add Compatible ID to txtsetup.oem? #--The following lines give additional USB floppy support id = "USB\Class_08&SubClass_04&Prot_00", "usbstor" #Compatible ID