try mo muna mag diskpart thru cmd
type "diskpart" enter
type "list disk" enter
Select mo yung drive mo "take note para makita mo yung drive mo, tingnan mo yung "disk size"
type "select disk #" yung # yun yung Disk number mo. enter
type "clean" enter
type "create partition primary" enter
type "select partition 1" enter
type "active" enter then format mo narin sa cmd
type " format FS=NTFS label= (kung anong gusto mo ipangalan sa Flashdrive mo) quick" enter
assign letter= (Pili ka ng letter ng drive mo, hindi pde yung gamit na tulad ng C or D)" enter then
type "exit".