I understand if I boot from a live cd I can see all the system logs under System > Administration > File Log Viewer
I have a major error with a disk not mounting and I want to trace i tback to the last time it did work and what may have corrupted the ext4 filesystem on it.
So within the File Log Viewer Where do I start examining?
I'd guess
/var/log/dmesg
You can find all logs that mention mounting or ext4 like this:
dmesg seemed to be the most relevant to me. And there are archived versions (dmesg.*).
You can find aditional information in syslog
or find mounted and unmounted logs