XD-1 system operation and results of system tests from 3 December 1955 through 10 March 1956

Abstract

The reliability of the XD-1 system has in general improved since the last report was issued (Memo 6M-4100 covering November, 1955). Overall reliability - up from 89% in December to 95% in February. Mean-good time between failures: No appreciable change. Lowest - 3.0 hours/biweekly period. Highest - 4.9 hours/biweekly period. Assigned time: Increased almost to the 168 hour per week limit during January, February and March. The tape drives are giving excessive trouble; these are being studied actively by both MIT and IBM to try to determine the cause. During January the Output System and the Auxiliary Drum System were successfully acceptance tested.