Mitsui Silver 74min 24x

I picked up a batch (50) of Mitsui Silvers rated for 24x writing. They are 74min CD-Rs, however, when I throw them into my Lite-On 40125W they are stated as being 80min by Nero and SmartBurn. Did Mitsui mess up in labeling them, or is there something up with my Lite-On drive? I’m going to try the CD-Rs in a friend’s burner or try different 74min media. Anyone else have any ideas? I know it doesn’t seem that it’s a big problem, but if the drive thinks they’re 80min, when they’re not, the write strategy may cause some problems. Thanks.