the "power calibration area" is a spot on the disc that the burners do some initial read-write tests to, to figure out how much cooking the disc needs. So that error message means, "bad" media, or maybe upgrade your firmware, or maybe it's an iDVD bug.
Try reducing the write speed to 1X.Some writers are fussy what they will write to. Also maybe a firmware upgrade is in order. My NEC1300A would not write to Princo discs until after an upgrade of the firmware.