Oops. Unfortunately, problems come in bunches. I used the Sony drive and Toast on my iMac to create a DVD DL data disc of photos, but the Super Drive on my iMac won't recognize the disc. It spins the disc for about 30 seconds, then spits it out. I have tried the "Mac and PC" setting as well as the UDF setting without success. The only way I can read the disc is using the Sony external drive. I have DL discs that I burned on a PC that my Super Drive can read, so I am at a loss to explain this.