A320 CAPT DESCRIBED ATC DIRECTED ABORT AT ORD REPORTEDLY DUE TO CONTINUOUS AMASS ALARM.

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WE HAD STARTED OUR TKOF ROLL FROM ORD RWY 32L AT INTXN T10. AFTER WE ENTERED THE HIGH SPD REGIME; TWR CALLED AND SAID IN A VERY QUIET; CALM VOICE; WITHOUT ANY URGENCY; THAT OUR TKOF CLRNC WAS CANCELED. THE FO IMMEDIATELY STATED TO TWR THAT WE WERE ALREADY ROLLING. VISIBILITY WAS RESTR; AND HE WANTED TO CLARIFY THAT TWR DID NOT THINK THAT WE WERE IN POS AND HAD NOT YET MOVED. TWR RESTATED HIS PRIOR XMISSION; AGAIN VERY CALMLY; AND WE ABORTED THE TKOF AT 120 KIAS/110 KT GND SPD. AFTER WE COMPLETED THE REJECTED TKOF AND CLRED THE RWY; TWR INFORMED US THAT THEY WERE GETTING A CONTINUOUS 'AMASS COLLISION SYS' ALARM; WHICH TURNED OUT TO BE DUE TO A SNOW PILE AT THE END OF THE RWY. THEIR CORRECT RESPONSE TO THIS ALARM WAS TO CLOSE THAT RWY UNTIL THE PROB ALARM COULD BE ADDRESSED. WE COMPLETED OUR CHKLIST PROCS IN ACCORDANCE WITH THE AIRBUS FLT MANUAL; AND WE RETURNED TO THE GATE FOR A MAINT INSPECTION OF THE BRAKES AND WHEELS; REFUELING; AND RE-DEICING. WE INFORMED THE PAX AND SPOKE WITH OUR COMPANY TO DISCUSS THE EVENT AND TO CONFIRM OUR RELEASE STATUS. A FALSE ALARM THAT SOUNDS CONTINUOUSLY IN THE TWR TO ERRONEOUSLY ALERT THEM TO AN INTRUDER ON THE RWY CAN LEAD TO COMPLACENCY OR TO DANGEROUS UNNEEDED REJECTED TKOFS. IN AN AREA PRONE TO WINTER WX AND THE SNOW PILES RESULTING FROM CLRING OPS; WHY DOES THE EQUIP DETECT AND INTERPRET A SNOW PILE TO BE A VEHICLE OR ACFT?