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check sum

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.01 sec.
check sum [′chek ‚səm]
(computer science)
A sum of digits or numbers used in a summation check.


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There is also a system to compare the check sums of loaded sections of FORTRAN programs to debug compilation problems on specific IBM computers.
The first is calculating a check sum during the backup process, then reading the tape, recalculating the check sum and doing a comparison--they should be equal.
If archived data is restored to the application and any changes are made, Active Archiving will compare the new check sum with the old upon re-archiving, conclude that changes have occurred, and save the newly archived data as a new file.
 
 
 
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