A B757 FMS DATABASE WAS RPTED AS 'CORRUPT.' TECHNICIAN DEFERRED THE FMS DATABASE AS INOP.

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ACFT X CAME TO GATE WITH PIREP STATING THE NAV DATABASE DATED AUG/XA/06 AND AUG/XY/06 WAS CORRUPT. I CALLED MAINT CTLR FOR GUIDANCE. MAINT CTLR SVCS SUGGESTED PLACARDING THE NAV DATABASES PER MEL. I INTERPED THE PLACARD TO COVER AN INOP FOR CORRUPTION DATABASE TO BE THE SAME AS AN INOP FOR OUT-OF-DATE; AS BOTH CONDITIONS WOULD REQUIRE MANUAL INPUTS OF DATA INTO THE FMS. I PRESUMED THAT THIS WAS WHAT MR X WAS ALSO THINKING SINCE THE FLT CREWS REGARD AN 'OUT-OF-DATE' DATABASE CONDITION TO BE AN INOP DATABASE; JUST AS A 'CORRUPT' DATABASE IS CONSIDERED TO BE AN INOP DATABASE. MR X CALLED ME ON WEDNESDAY MORNING. HE NOW BELIEVES THAT HE MAY HAVE ADVISED ME INCORRECTLY ON THE DEFERRAL. I STILL THINK THAT THE BASIC REASONING FOR DEFERRAL WAS SOUND; BUT WISH TO RPT IT. I HAVE VERIFIED THAT THE DATABASES HAVE ALREADY BEEN UPDATED ON ACFT X. IN THE FUTURE; I WILL PRESS FOR MORE DISCUSSION OF ITEMS THAT ARE NOT COMPLETELY CLR BTWN TECHNICAL SVC AND ME. THE NON-STOP WORK ASSIGNMENTS FROM THE START OF SHIFT; WITH MULTIPLE DISTRS OF RADIO AND PHONE CONVERSATIONS IN THE OFFICE WHILE WORKING ON THE DEFERRAL NEAR DEP TIME; INTERFERED WITH COM AND UNDERSTANDING BTWN TECHNICAL SVC AND ME. THIS CAUSED US TO ASSUME 'CORRUPT' INOP TO BE THE SAME AS 'OUT-OF-DATE' INOP.