I never write that stuff down. Never understood why it was important to record. My simple brain.
But a notebook, or a Palm electronic gizmo, will do if you need to make note what you are doing in the field.
I think shutter speed and f/stop publishing by photo magazines years ago made recording of exposure popular.
Unless I'm shooting large format and need to know what type of development a negative needs when applying the zone system, where I simply have to note "normal - minus 1", "normal", "normal +1", "normal +2", or some variation on that theme, I don't write much down at all.