RE:The normal "hum, hum" sound of the hard disk belongs to the sound of the motor running. The sound will be slightly louder when installing the system or copying data, but also belongs to the regular sound.
If there is an irregular "click, click" sound louder than the fan, then consider replacing the hard disk.
Hard disk light is always on, first of all to confirm whether the computer crashed, to see whether the hard disk is running normally.