Enable / Disable Journaling on EXT4 partition

"^has_journal" switched it off, "has_journal" will switch it back on. The tune2fs command allows you to change options on a file system that already exists.

To disable journaling:

sudo mke2fs -t ext4 -O ^has_journal /dev/sdb1

To (re)enable journaling:

sudo tune2fs -O has_journal /dev/sdb1

The dumpe2fs command will let you see the state of the file system:

sudo dumpe2fs -h /dev/sdb1

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