the 1.2x GigaRec doesn't give a higher capacity than a 99min CDR (lower, actually).
i would be interested to see if you LiteOn DVD-ROM can read GigaRec discs written at 1.3x and 1.4x. Ian in his review of the Premium says that compatibility of such discs with other drives is very low or nonexistent...
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien