See my post in the forum. From the wording of it, I think they're referring to laser calibration data, which is data stored in a drive, is not included in the firmware, and is not changed by firmware flashes. If the 2500A is improperly calibrated for DL, then there would be problems (could be that the CDRInfo testers just got lucky with a drive whose calibration wasn't that far off from optimal). Also, the point about needing bitsetting is a very good and important point. Without bitsetting, these discs will have a hard time reading in various devices, and this 2510 firmware that we have doesn't have bitsetting.