NEC 1300a Help

I Have a Nec 1300a and it will not burn any disk at 4x only 2x, i have recently baught some 8x disks and they will not burn at any speed (options are 1x 2x and 4x) i think i need a flash but which one and where 2 get it?

Which Media are you using? Maybe the 1300A isn´t able to burn this media faster than 2x.