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Subject: Disk errors
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I am getting one or two of these a day on a Western Digital 80GB disk
How concerned should I be?  The machine seems reliable otherwise.

ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=61092255
ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=61314367
ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=7139615