If it's the "drive buffer" that does it, you have nothing to worry about. It's perfectly normal for all recent high-speed drives.
The drive re-calibrates the laser during the burn at regular intervals (about every 500MB, and at each actual burning speed change)
@muzykmarcin, when DMA is not activated I think the first symptom is you can't burn faster than 4X, sometimes not even faster than 2.4X.
Nevertheless, the advice is good to take, checking your DMA settings won't hurt :iagree: