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Date: Sat, 24 May 2003 16:04:02 -0400
From: Zer0 <ellen.macisaac@ns.sympatico.ca>
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To: Roberto Nunnari <nunnari@die.supsi.ch>
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cc: freebsd-stable@freebsd.org
Subject: Re: UDMA ICRC error
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Roberto Nunnari wrote:

> Hi there.
>
> OS version: FreeBSD 4.7-Stable FreeBSD #3
>
>   <cliped>.
>
> can anybody tell me what does that UDMA ICRC error means?
>
> May 24 19:58:30 saturn /kernel: ad0: DMA limited to UDMA33, non-ATA66 
> cable or device
> May 24 19:58:30 saturn /kernel: ad0: 9770MB <Maxtor 91021U2> 
> [19852/16/63] at ata0-master UDMA33
> May 24 19:58:30 saturn /kernel: ad1: 19092MB <Maxtor 2B020H1> 
> [38792/16/63] at ata1-master UDMA33
> May 24 19:58:30 saturn /kernel: Mounting root from ufs:/dev/ad0s1a
> May 24 19:58:30 saturn /kernel: ad1s1a: UDMA ICRC error reading fsbn 
> 32 of 16-31 (ad1s1 bn 32; cn 0 tn 0 sn 32) retrying
> May 24 19:58:30 saturn last message repeated 2 times
> May 24 19:58:30 saturn /kernel: ad1s1a: UDMA ICRC error reading fsbn 
> 32 of 16-31 (ad1s1 bn 32; cn 0 tn 0 sn 32) falling back to PIO mode 


Hmm I've also hit this problem as well
I've been thru the Mailing archive and numerous sites.
The problem began with 4.7 - 4.8 stable and release.