windows, C programer, How to raw read DVD? Need help!

[zhaopz]

i am C programer, when copy Cdrom, we can use the IOCTL_CDROM_RAW_READ to read the CD-ROM, but copy DVD-ROM, what is the fastest method? How to raw read DVD-ROM? we need help, please help me.

[zhaopz]

I am C programer, in our program i have used the IOCTL_CDROM_RAW_READ to raw read the CD, now i want to raw read DVD, but i donot know what to do in our

program. How to raw read DVD? Tks, i need help.