If you can’t format it in Fat16 buy right clicking on the G6 icon & picking format.
Try this freeware program “HP USB Disk Storage Format Tool” works great on
SD cards should work the same on the G6.
HP USB Disk Storage Format Tool
_http://www.pctipp.ch/downloads/dl/32594.asp
if you bothered to check the format command by typing format /? under the command prompt, it would of answered all your questions, but it seems like you are not dos competent so this is what you do: