From the command line: sudo mdutil -E / sudo mdutil -i on / The amount of time this will take depends on how many files are on your hard drive.

For those eagerly awaiting the latest security patches from Apple on Snow Leopard, they’re here! Client version can be downloaded here. Server version can be downloaded here. From Apple’s KB Article about the Client version, here are the fixes. General operating system fixes provided for: an issue that caused data to be deleted when using [...]