Right, but it needs to _actively log_ when it has to fix something, otherwise you wind up in the situation of the semi-famous old Multics problem where (IIRC) the system was running slower and slower... finally someone looked at the Disk DIM (driver) counters, and one drive was slowly failing, but the industrial-strength recovery code in the Multics Disk DIM was masking the problem (except for the performance degradation). The DIM was thereupon modified to notify the operator if 'too many' retries had to be done 'too often'. Noel