90 minutes boot time... I have a feeling the summarized age of the hard drives in that system exceeds the age of the United States itself (which is 247 years).

90 minutes boot time... I have a feeling the summarized age of the hard drives in that system exceeds the age of the United States itself (which is 247 years). When fsck was introduced in 4BSD in 1980, it checked every filesystem on boot because it had no better idea. If this thing is, say, forty years old then that's exactly the right age for this...