Thanks for the reply.
I think I've already had a clear mind of booktype. Changing a DVD+R DL bookmark to a DVD-ROM type, it could make my console recognize the disk I burn is a commercial pressed dvd-rom instead of a DVD+R DL disk.(I read the GUIDES before I ask)
Fellows in some xbox forums say that a booktype changed disk is easier for xbox360 to recognize, that's why I want to change it.
So now it seems that my device is unsupported changing the booktype, I'll try another device.
And I hadn't burn it yet.
Thank you again, for your help and your amazing softwear!