Back when I used to regularly dual-boot OS 9 and OS X, I periodically had to reinstall one or both systems due to disk corruption.
I tentatively concluded at the time that it might be because OS X used disk journalling, whereby every modification written to the disk is also logged for disaster recovery, and OS 9 did not. Thus, an I/O error under OS 9 – or even everyday disk activity – would be completely invisible to OS X, when the machine was next booted into it.
Did anyone else have a similar experience, and if so, what did you do about it?
I tentatively concluded at the time that it might be because OS X used disk journalling, whereby every modification written to the disk is also logged for disaster recovery, and OS 9 did not. Thus, an I/O error under OS 9 – or even everyday disk activity – would be completely invisible to OS X, when the machine was next booted into it.
Did anyone else have a similar experience, and if so, what did you do about it?

