Asides from viewing dmesg logs, does mount keep any records of when a partition has been mounted? perhaps viewing the ctime of the mount target? Does anyone have a definitive command for that?
mount -- how long has a partition been mounted?
mount
The system tools for the filesystem you're using should be able to help you with that.For example with ext2 / ext3 / ext4 there's dumpe2fs:$ sudo dumpe2fs -h /dev/sda1 | grep 'Last mount time'Last mount time:          Mon Apr 18 18:13:05 2016(where /dev/sda1 is the partition you're interested in)