Operating systems have many file- and directory-level settings that are invisible to the typical users. There are files that govern the location of data, invisible files that relate to the trash or other system-essential files, permissions, and so on. Even though these files are unseen, they are none-the-less important, and a minor corruption in th...

	Read more at MacNN
	www.macnn.com/articles/08/02/15/first.look.at.diskwarrior/