I've burned 2 cds so far and both turned out as coasters, at the max speed of 24x on my macbook pro. I called apple and they told me that this is normal and that I should simply burn slower, but I don't see how this makes any sense as I used to burn at 40x on my old pc. Do any of you guys have problems burning at 24x? Also, my CD-Rs are by Sony so I'd figure they'd be good quality. Please help!!