The disallow directive is used to instruct search engines not to crawl a page on a site and is added within the robots.txt file. This will also prevent a page from appearing within search results. Within our Hangout Notes, we explain how Google deals with disallow directives, with best practice advice and examples.

Backlink Disavow Doesn’t Do Anything Until Google Updates Penguin Data

August 29, 2014 Source

If you have a Penguin penalty for backlinks, and you remove or disavow those backlinks, you won’t see any effect until Google updates the algorithm again and refreshes the data. John says it’s a long delay and you should go as far as possible with disavow including domain level disallow directive to make sure you cover as much as you can.

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