Sometimes disk spins up when computer is inactive and it lasts and lasts and lasts. I have no idea how to figure out what it is.

Usually I notice this while lying down and by the time I get there and start iotop it's gone. It feels like I am using windows and my data is just being read from the disk without my permission and sent God knows where.

I have atop installed but I have no idea how to use it for this user case.
atop -d shows data in real time and doesn't filter it for long continuous use.


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