Sometimes Dashboard may crash or will not launch for one reason or another. Or maybe you just want to disable it to conserve RAM. Here is how it is done:
Launch Terminal, which is located in the Utilities folder of your Applications. To enable Dashboard, enter the following command:
defaults write com.apple.dashboard mcx-disabled -boolean NO
Then, restart the dock by entering this command:
killall Dock
To disable it, enter this:
defaults write com.apple.dashboard mcx-disabled -boolean YES
Then repeat the “killall Dock” command.
[Via Mac OS X Things]
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