It has no problem if I used a usb1.1 flash drive. However, when I tried a usb2.0 flash drive, there is no drive letter appearing in Windows Explorer. I am running XP Pro with SP1. My colleague has a PC with the same hardware configuration and I had no problem plugging the usb2.0 flash drive in his machine. Device manager did show the usb2.0 flash drive when I plugged it in the usb port. Any idea?