Correct me if I am wrong, but XP does not support loading F6 drivers from a device other than a floppy.
2003 and Vista are only capable of that.
Yup, saw that in Maximum PC too. Those are only two of the three known models that will work, no mention of the third but apparently it won't be "found" anyways.On the subject of USB floppy devices. I've read there are very few of these actually work during XP installation.
IBM USB Portable (part number ASM P/N 27L4226 or FRU P/N 05K9283) is known to work.