A B777-200 FLT MANAGEMENT COMPUTER WAS LOADED WITH THE INCORRECT NAV DATABASE. OUT OF DATE DOWNLOAD GIVEN TO TECHNICIAN FOR LOADING.

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PROCEEDED WITH COMPLETING THE A-CHK PER OUR PAPERWORK. STARTED ATTENDING TO THE VARIOUS 'DEFERREDS.' ALSO ON MY LIST OF ASSIGNED WORK WAS THE INSTALLATION OF THE NEW MONTHLY REVISION OF THE NAV DATABASE LOAD (SOFTWARE) INTO THE FLT MGMNT COMPUTER. I PROCEEDED TO LOAD THE SOFTWARE PER OUR PAPERWORK. AS A HABIT I ALWAYS MAKE A POINT OF WRITING DOWN THE SOFTWARE INFO ON MY SHEET OF ASSIGNED WORK SO I CAN INCLUDE THAT INFO IN MY SIGNOFF...WHICH I DID; HOWEVER AS I WAS CHKING AND DOUBLE-CHKING THE SOFTWARE NUMBER AS I WAS WRITING IT DOWN I FAILED TO NOTICE ONE DIGIT (WHICH IS THE REASON FOR THIS FORM). THE 'CALL-OUT' WAS TO LOAD NEW REVISION NAV DATABASE FOR AUGUST USING 'Y-ABCD' AND THE DISK SET THAT I LOADED WHICH WAS BROUGHT TO ME WAS 'X-ABCD.' I DID NOT CATCH THE ERROR READING IT BACK TO MYSELF; VERIFYING IT OFF OF THE LIST OR VERIFYING IT OFF OF BOTH FMC'S. THE ACFT ACCEPTED THE LOAD. I SIGNED OFF THIS CALLOUT. UPON RETURNING BACK TO WORK TODAY FROM MY DAYS OFF AUG/THU/06 (WORKING FOR AUG/FRI/06) I HAD AN EMAIL IN THE COMPANY COMPUTER SYS FROM ONE OF OUR SYS MAINT CTLRS ON THE B777 OF MY ERROR. IN THE NOTE THE CTLR HIGHLIGHTS THAT IN MY SIGNOFF I INPUT THE WRONG SOFTWARE NUMBER AND THAT MAINT CTL HAD ASKED THE FLT CREW FLYING THAT ACFT RIGHT AFTER THE A-CHK TO VERIFY WHAT SOFTWARE THAT WAS INSTALLED. THEY DID AND FOUND IT TO BE THE INCORRECT SOFTWARE. AT THAT POINT MAINT CTL MADE A CALLOUT TO HAVE CORRECT REVISION SOFTWARE INSTALLED AND THE TECHNICIANS AT ZZZ1 RESOLVED THE ISSUE. I FEEL I READ THE DISK LABEL TOO FAST AND THEREBY MISSING THE 1 WRONG DIGIT; HAD I CAUGHT THE MISTAKE I WOULD NOT HAVE LOADED THE INCORRECT SOFTWARE AND ADVISED MY MGMNT TO 'BREAK' THAT PARTICULAR ITEM DUE TO MY STATION'S LACK OF HAVING ANY MGMNT TYPE ON THAT NIGHT WHO COULD MAKE UP NAV DISKS.