Table 3: Memory errors that observed on Alsat-1 during a 7-year period.

Event upset observation for Alsat-1

System monitoredOBC 386 RAMDISK memory
EDAC codeR-S (256,252)
Memory size32 Mbytes
HybridSYS84000RKXLI-70 (4M × 8-bit)
DeviceSamsung SEC KM684000BLT-5L: 512K × 8-BIT SRAM
Observation period2510 days November 29, 2002–October 12, 2009
Bits monitored268435456
No. of single-bit errors244150 (98.6%)
No. of multiple-bit errors217 (0.08%)
No. of double-byte errors2996 (1.21%)
No. of severe errors230 (0.09%)