The Dashboard in Mac OS X was first introduced in version 10.4, and can be used to run many useful widgets (ie. calendar, package tracker, weather). Even though it can come in handy for checking quick stats and info, it often goes unused by Mac users.
Since there really isn’t a point in having it running if you’re not going to use it, here’s how you can disable the Dashboard in Mac OS X.
Open Terminal and enter the following commands:
defaults write com.apple.dashboard mcx-disabled -boolean YES killall Dock
Finder will restart automatically and there will be no more dashboard.
If you ever want to re-enable the Dashboard, enter these commands in Terminal:
defaults write com.apple.dashboard mcx-disabled -boolean NO killall Dock
Again, Finder will restart and the Dashboard will be back as it if never left.
via Addictive Tips