hi,
you can format it using a third party software such as.
HP format utility
you can get this free software from the following site...
http://www.softpedia.com/progDownload/HP-USB-Disk-Storage-Format-Tool-Download-123786.htmlif it didn't work you need to install another software named unlocke, install it and plug in your thumb drive..
right click on it and select unlocker in it select all processes that are currently using the thumb drive and click on unlock all...
then use the hp usb disk fomat tool to format it...
if this one finds helpful please give a vote....
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