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If you want to block the /mobile folder from being crawled you would need to set up a robots.txt file and input this text: User-agent: * Disallow: /mobile Personally, I would use the rel=canonical tag and tell search engines that the preferred version of the page would be the non-mobile version. You can learn more about rel=canonical here... http://www.seomoz.org/learn-seo/canonicalization