USB device activity when not mounted

Gary Aitken freebsd at
Thu Jun 14 04:26:23 UTC 2012

I can understand why I would see activity on a USB device when it's first plugged in.  But why do I see continued activity (i.e. the light blinks on a usb disk or memory stick)?  When I umount one of these, they keep being beat up on and it makes me nervous...  At what point is it sync'd and safe to unplug?  I assume when the umount returns, but what's going on after that?


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