The error event log has a limited size. After it is full, newer entries replace the oldest entries. If the old entry has not been fixed, it is not replaced by newer entries.
To avoid the possibility of an error condition causing the log to be flooded by a single error, some errors of the same type are recorded in the same space in the error event log. When error-event log entries are coalesced in this way, the time stamp of the first occurrence and the last occurrence of the problem is saved in the log entry. A count of the number of times that the error condition has occurred is also saved in the log entry.