Thanks. well the brands of discs i have been using are Sony, Maxell, Memorex, and i have used Verbatim. the maximum speed of Sony is 2.4x i have burned at 2.4x. the maximum speed of Maxell is 8x i have burned at 4x and 8x. the maximum speed of Memorex are 8x and 16x i have burned in 4x, 8x, 2.4x, and 16x. and still i get the same results. the burner never finishes its job.