A while ago my MacBook Pro started having problems burning discs. There was the occasional failure now and then. But tonight I had four failed burns in a row. The log showed some odd messages.
Disk Utility: Burn sense: 3/73/03 Medium Error, Power calibration area error
Disk Utility: Burn error: 0x8002006D The disc can’t be burned; it might be incompatible with this disc drive. Please try a different brand of disc, or try burning at a slower speed.
Googling gave a lot of suggestions; take it to the Apple Store, replace the drive, buy discs rated for slower speeds, etc. Then I found a mention of just blowing some compressed air into the drive slot. I grabbed some compressed air, blasted it in there, and burned two discs in a row without errors.
It’s always nice to stumble across a cheap, easy fix.