Red Hard

What does the red light of the hard disk signify?

I want to know what a blinking hard disk red light or the staying on of it signifies.Does the staying on signify virus activity or hard disk or ram problem? I know it stays on for some time as a computer starts for the first time and the sartup programs continue to load. But my question relates to what happens after all the startup programs have loaded.

It just shows that is active.

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