if you have transcend pen drive infected by 9u.exe which is a write protect virus then the following works like a charm:
1) download JetFlash online recovery from:
2) run the program
3) specify the capacity of your drive eg.512 MB, 1 GB .....etc
4) choose "repair and erase all data" OR " repair and keep existing data"
5) progress bar starts.......completes
6) notification appears ---" format complete"
7) unplug and plug your drive and .....presto
by the way I am just a doctor by profession