Disable Macbook boot sound / chime

To disable that annoying sound at bootup:

sudo nvram SystemAudioVolume="%00"

To re-enable sound:

sudo nvram -d SystemAudioVolume

Doesn’t affect sounds inside OS X.

Create boot media for OS X Maverick

  1. Install Maverick from App Store
  2. Format USB stick (8GB+) to GUID, 1 partition
  3. sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction

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