Sorry for not being explicit, Rita.

I meant with your external connected. It's the external I think you to examine.

So run the command in Sierra 2015 but with your external connected. That will give you results for both your internal and external.

By the way, what's in the Mojave and Catalina partitions? Did you install them?

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire