This is the second spindle of Memorex recordable media I've had to trash because they are not compatible with my Macbook Pro - I earlier tossed a pack of 25 Memorex DVDs, too. Shame on me for getting fooled twice, I guess. I'll never buy Memorex media again, that's for certain. I have no problems using Sony media with my machine, and I will stick to that brand even though it costs a bit more.