How are your sata burners multitasking? - chipset up to it?
Can you test and report back?
Having a AM3 770 chipset I must conclude burning concurrently with 2 sata writer apparently is too much as the imgburn buffer bars are constantly jumping up/down/pausing for buffer fill… even the CPU is only 12% utilised.
are your writers running dry? what is your situation, what is your chipset?
would be nice to have some feedback