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Date:      Mon, 19 Aug 2002 11:25:08 -0500
From:      Dan Nelson <dnelson@allantgroup.com>
To:        Justas Jakubauskas <justas@vusa.lt>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: UDMA ICRC error
Message-ID:  <20020819162508.GC70455@dan.emsphone.com>
In-Reply-To: <148795974631.20020819171910@vusa.lt>
References:  <148795974631.20020819171910@vusa.lt>

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In the last episode (Aug 19), Justas Jakubauskas said:
> Hello,
> What does it mean when in booting time i have such messages:
> 
> Aug 19 17:15:28 bsd /kernel: ad0s1a: UDMA ICRC error reading fsbn 183359 of 91648-91775 (ad0s1 bn 183359; cn 11 tn 105 sn 29) retrying
> Aug 19 17:15:28 bsd /kernel: ad0s1a: UDMA ICRC error reading fsbn 183359 of 91648-91775 (ad0s1 bn 183359; cn 11 tn 105 sn 29) retrying
> Aug 19 17:15:28 bsd /kernel: ad0s1a: UDMA ICRC error reading fsbn 183615 of 91776-91871 (ad0s1 bn 183615; cn 11 tn 109 sn 33) retrying
> Aug 19 17:15:28 bsd /kernel: ad0s1a: UDMA ICRC error writing fsbn 95 of 16-31 (ad0s1 bn 95; cn 0 tn 1 sn 32) retrying
> Aug 19 17:15:28 bsd /kernel: ad0s1g: UDMA ICRC error reading fsbn 122478783 of 57962560-57962591 (ad0s1 bn 122478783; cn 7623 tn 242 sn 42) retrying
> ...
> Aug 19 17:15:28 bsd /kernel: ad0s1g: UDMA ICRC error writing fsbn 6565119 of 5728-5739 (ad0s1 bn 6565119; cn 408 tn 168 sn 15) falling back to PIO mode
> 
> does that shows that mine hard disk is going to die or it may by UDMA 33
> cables connected to UDMA 100 hard disk fault or smth else ?

That's your problem.  ICRC errors are cabling errors.  The drive sent a
valid data block to the computer, but when the computer checked the CRC
it was wrong.  Either force your drive to udma33 speed with the
"atacontrol mode" command, or buy a udma100 cable.

-- 
	Dan Nelson
	dnelson@allantgroup.com

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