My combo driver often fails(almost 10 out of 15 times) when burning a cd-r disk, no matter what's burning, audio or data, and no matter what the speed is, 8x to 32x. why is this happen? the Toast 6.0.5 reports errors like this: Medium Error, or Running out of buffer without underrun protection. But I do checked the buffer underrun protection checkbox!! And, it is more likely to fail writing in with larger amount of data, for instance, writing larger than 400 mb. any help or advice is appreciated!!! thanks a lot in advance!!