Power calibration error

I borrowed a friend's cds with recording of the Olympic Games from Astro to be copied. My DVD burner returned an error known as 'power calibration error'. I tried several of the same type of media and had the same error message. After that, I used a branded DVD disk and the error message did not appear again. Finally the burner did the job of copying disks for me.
I am still at sea as to why this happened.