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I have the same answer as anyone else: Mozilla FireFox provides a lot of SEO tools. so you can check the pagerank, the do-follow attribute and much more. But Chrome is doing a good job also, with more and more SEO plugins.

I don't really understand why you would want to make the files in folders contiguous. As other have stated, there isn't any relationship between the way the files are organized in folders and the way they are scattered in the HDD. Defragging tools differ according to the time they take …

Forum posting, if used right, is a mine of gold as a backlinking method and rising in the serps. But you have to choose some authority forums with high pageranks and related to your niche and try to make relevant posts not to be considered a spammer. Respect the community …