This is to bad Grzyb! I lost a harddrive (with no back-up) once and know the feeling...
You either have a bad temperature problem or, also possible, live in an area with very instable electrisity environment. Flanderz allready mentioned harddrive coolers as one thing to test. Then you also might have to filter the main power from the outlet, or run using an filtered type of UPS. Expensive but nice. There might be other causes for this too, but this is what cross my mind.
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unicorn
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