When you look at the specs for this DVD burner (for example):
WRITE Speed
DVD+R 8X
DVD+RW 8X
DVD-R 8X
DVD-RW 6X
CD-R 24X
CD-RW 16X
DVD+R DL 6X
DVD-R DL 6X
DVD-RAM 5X
READ Speed
DVD-ROM 8X
CD-ROM 24X
straight from newegg.com
what makes a laser a 6x, 12x etc... when you extract it...