The startup sound of Mac …

The startup sound of Mac won't disappear if I mute the speaker.
The startup sound just annoys me, so I wanna disable it.

Disable startup sound

$ sudo nvram SystemAudioVolume=%80

It should work.

Enable startup sound again

To enable the startup sound

sudo nvram -d SystemAudioVolume

Just still don't know why %80 O_o?

References

Silence Your Mac Boot Startup Sound Altogether [OS X Tips]

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