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My Reolink 8Ch NVR has:

1 x internal 4TB HDD
1 x external 4TB HDD (eSATA)

I am using the Mac desktop app to monitor usage of these drives and have noticed that after initialising both drives, they showed 3179 GB

The external drive was automatically taken into use, indicated by a steady reduction in available disk space.

I anticipated that once the external drive was empty the operating system would automatically switch to the internal drive.

However, when the external drive reached 2816.77 the operating system switched to the internal drive which is now steadily reducing in disk space.

Current readings:

Internal 0 3179 GB 3106.77
External eSATA 3179 GB 2816.77


Questions:

1. As these are 4TB drives, why is there only 3179 GB available after initialisation?

2. How does the operating system deploy available disk space across multiple drives?