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Hardening your files with Reed-Solomon codes
ttsiodras.googlepages.com/rsbep.html, posted 2008 by peter in backup download free howto linux recovery software storage
What follows is a simple description of a way I use to additionally "shield" my important files (a daily "tar" I take every night through a cron job), so that even if some sectors hosting them are lost, I still end up salvaging everything.