Open CMD hold and press Win button+R.
Type the Drive of ur flashdrive,
sample F: or G: and press Enter.
Next Type " dir " without Quote.
then type Attrib -a -s -h * /s /d
and press Enter.
pag tapos na ito sunod type CHKDSK /F and Enter then Press y or Y. tapos hintayin mo lng ma.complete ang...