I have two USB flash drives. One works, one does not. Interestingly enough, the one that doesn't work is Microsoft branded. USB\VID_058F&PID_9380\4&170B8D68&0&1 JMTek USBDrive USB Device The one that does work is a LeadingDriver UD-11 USB\VID_067B&PID_2317\4&170B8D68&0&2