Well, it looks like I stand corrected. But of course, you do have a label. For example.
GRMCHPXFRER_EN_DVD This is the DVD's name of the 64-bit W7 upgrade disk (Is that what you have?)
GRMCHPFRER_EN_DVD . This is the name of the win7_homepremium_english_x86_retail
But if the Op wants some further information on his DVD, he will find a little in the Sources\ cversion.ini