I too lean towards a power problem here. SATA seems to be very fickle where power is concerned... it seems to me that if I soft reset my machine (AMD64 3000+, 1G ram, 2xSATA 160G, 1xMemorex CD/DVD burner on 450W supply), I get READ_DMA timeouts from the disks - it's especially a pain if I've had a power failure because my gmirror rebuild and file system fscks spit out tons of READ_DMA timeout errors, and most likely the mirror rebuild will fail with a READ_DMA failure. However, it seems that if I completely power the machine down and cold boot, the error go away. I can't explain it. So now I've got my box on a UPS running apcupsd so it never goes down ungracefully.
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perl -e "eval pack(q{H*}, join q{},qw{7072696e74207061636b28717b482a7d2c717b34393 23036333631366532303666366536633739323036313733373 33735366436353230373936663735323036353738373036353 63337343635363432303734363836393733323037343666323 03632363532303631323036633639373437343663363532303 66436663732363532303635366537343635373237343631363 93665363936653637326530617d293b})"
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