The below guide is the general rule of thumb when it comes down to Xbox DVD-ROM(s) reading "blank" media, this isn't always true, there have been cases where different media will work in different drives, and different brands of media (i.e. generic, or expensive) will work, and some won't.
When burning for the Xbox, we best recommend Ritek DVD-R for all Xbox DVD-ROM drives.
Samsung Drive:
Reads all CD-R/RW
Reads all DVD-R/RW
Will not read DVD+R/RW
Thomson Drive:
Will not read CD-R
Will only read SOME (generally expensive media) CD-RW
Reads all DVD-R/RW
Reads all DVD+R/RW
Philips Drive:
Will not read CD-R
Will read SOME (generally expensive media) CD-RW
Reads all DVD-R/RW
Does not read DVD+R/RW
Hitachi LG:
Not on picture,looks like a Thomson with 2 small holes in the tray (surfaced nov 2004)
Will not read CD-R
Will only read SOME (generally expensive media) CD-RW
Reads all DVD-R/RW
Reads all DVD+R/RW
All Drives Manufactured November 2004 or later:
Reads DVD + media