I have an intel macbook dual 2Ghz, bought about three years ago. I've had some problems with the superdrive and changed it a year and a half ago.
the drive is Matshita DVD-R UJ 857

now I'm into burning cd's again and try to burn a DVD with Toast Titanium from an .iso on my hard drive

But it won't work. When I launch the burn, the disc suddenly stops turning, and an error log pops:
medium error, sense code = 0x73, 0x03

then I try with the built in cd burner of the macbook as soon as I click burn, the cd stops turning in the drive, and error log says peripheral couldn't calibrate power of the laser required for medium

so since I'm not that logical of a geek, I try my first idea: let's see with other brands of DVD!
the problem is that it works, now.

but I'd like for all of my medium to be usable, and I've already seen my ridata DVD being burn, so here's the question.

What the hell is happening with my superdrive? :)