A CL65 FLC DIVERTS TO BUF (DEST ARPT OF ROC) WHEN THEIR EICAS SYS WARNS OF CARGO SMOKE. AT BUF IT WAS DETERMINED THAT THEY HAD A FALSE WARNING; POSSIBLY CONNECTING THE EVENT WITH 2 LAPTOP COMPUTERS THAT WERE IN USE AT THE TIME.

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CRUISING AT FL270 'SMOKE' AURAL WARNING AND 'CARGO SMOKE' EICAS MESSAGE ANNUNCIATED. PERFORMED APPROPRIATE MEMORY ITEMS AND QRH PROCS. IMMEDIATELY DECLARED AN EMER AND BEGAN A DSCNT (PER QRH) DOWN TO 10000 FT. IT SHOULD BE NOTED THAT DURING THE DSCNT WE ALSO HAD A 'DISPLAY COOL' CAUTION MESSAGE -- PROBABLY TOTALLY UNRELATED; BUT BECAUSE OF THE TIMING; IT BEARS MENTIONING. QRH PROCS WERE FOLLOWED. A DECISION WAS MADE TO DIVERT TO BUF -- THE ORIGINAL DEST HAD BEEN ROC; AND SO ADVISED ATC. THE FLT ATTENDANT WAS INFORMED OF THE WARNING AND POSSIBLE FIRE; AND TOLD OF THE DIVERSION. SHE THEN BRIEFED THE PAX. WE HAD ON BOARD A COMPANY PLT JUMP SEATING AND A DEADHEADING FLT ATTENDANT. BOTH TURNED OUT TO BE VERY VALUABLE AND HELPFUL RESOURCES. UPON LNDG IN BUF; WE TAXIED CLR OF THE RWY AND HAD ARPT CFR PERSONNEL OPEN THE CARGO BIN TO DETERMINE IF THERE WAS A FIRE. THEY DETERMINED THAT THE PLANE WAS SAFE TO TAXI TO THE GATE FOR A NORMAL DEPLANING. AN EMER EVAC WAS NOT NECESSARY -- IN FACT; THIS APPEARS TO HAVE BEEN A FALSE ALARM. THE FLT ATTENDANT NOTED THAT 2 LAPTOP COMPUTERS WERE IN USE AT THE TIME. POSSIBLE CULPRITS? THE LNDG WAS APPROX 200 LBS OVERWT. APPROPRIATE WRITE-UP WAS MADE AND INSPECTION PERFORMED. CREW COORD WAS EXCELLENT. DUE TO THE HIGH STRESS ENVIRONMENT AND INCREASED LIKELIHOOD OF MISTAKES; I RECOMMEND THE QRH PROCS NOT BE MEMORY ITEMS. THE TIME CONSUMED BY USING QRH IS JUSTIFIED IN THE HIGHER CERTAINTY OF DOING THINGS CORRECTLY. SUPPLEMENTAL INFO FROM ACN 464518: AT THE TIME OF THE 'CARGO SMOKE' WARNING; 2 LAPTOP COMPUTERS WERE IN OP (PAX). THEIR POSSIBLE INTERFERENCE WITH THE CARGO SMOKE DETECTOR MIGHT JUSTIFY FURTHER TESTS.