B757-200 FLT CREW HAS EICAS WARNING ON TKOF ROLL AND REJECTS TKOF AT EINN.

Narrative

I WAS THE CAPT ON FLT. WX AT THE TIME OF THE ATTEMPTED TKOF WAS CAVOK. IT WAS THE FO'S TKOF; WE HAD JUST SET TKOF PWR; RELEASED THE BRAKES AND VERY SHORTLY THEREAFTER; THE 'R GENERATOR DRIVE' LIGHT EICAS MESSAGE ILLUMINATED. I ANNOUNCED THE 'ABORT;' ASSUMED CTL OF THE ACFT AT APPROX 30 KIAS AND COMPLETED THE ABORT MANEUVER. THE FO NOTIFIED THE CTL TWR OF OUR ABORT AND OUR INTENTIONS TO RETURN TO THE GATE AND THAT NO EMER ASSISTANCE WAS REQUIRED. UPON REACHING THE GATE; I WAS INFORMED BY THE MECH THAT A TIRE ON THE R TRUCK WAS 'FODDED' AND NEEDED REPLACEMENT AS WELL AS THE R IDG BEING 2 QUARTS LOW ON OIL. NO OTHER FAULT MESSAGES CONCERNING THE IDG WERE STORED. THE R IDG WAS PLACARDED INOP; I CONTACTED THE DISPATCHER AND OBTAINED A NEW RELEASE FOR 120 MIN ETOPS; WITH THE COMMENSURATE ADDITIONAL FUEL REQUIRED FOR CONTINUOUS APU USAGE ON THE FLT. AFTER THE MAINT ITEMS WERE COMPLETED AND A NEW RELEASE OBTAINED; WE DEPARTED; DISCONNECTED THE IDG AFTER ENG START PER MEL; AND CONTINUED WITHOUT INCIDENT.