a little more indepth than some:
http://www.theglobeandmail.com/servlet/story/RTGAM.20090223.wferguson0223/BNStory/crashandrecovery/home
http://www.theglobeandmail.com/servlet/story/RTGAM.20090223.wferguson0223/BNStory/crashandrecovery/home
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