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Date:      Mon, 11 Mar 2002 13:37:53 -0500 (EST)
From:      Jason Borkowsky <jcborkow@tcpns.com>
To:        questions@freebsd.org
Cc:        scottro@nyc.rr.com, <malan_joubert@hotmail.com>
Subject:   Re: UDMA ICRC error writing
Message-ID:  <Pine.BSF.4.44.0203111332160.4043-100000@bemused.tcpns.com>

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>>I've recently been getting the following error on my FreeBSD system,
>>Anyone know what could cause it?
>>Could it be a broken HD?
>>How do i fix it?
>>Thanx
>>Error:
>>ad0s1a: UDMA ICRC error writing fsbn 13416703 of 6197344-6197375 (ad0s1 bn
>>13416703; cn 835 tn 38 sn 34)

>Replace your IDE cable with shielded 80 pin ATA100 cable and it should go
>away.

Notice the word "should". I have two sets of these cables, and I still get
the problem. I also get the problem irregardless of hard drive I use (I have
an IBM, Seagate, and a Maxtor). The problem in my case seems to be certain
incompatibilies between ATA100 drives and ATA66 motherboards (mine is an
A-bit KT7).

The get the errors to go away (and avoid possible data corruption), you can
always do a:

sysctl hw.atamodes=pio,---,---,---,

This will slow the read/write speed to 16Mb/s, which is no big deal in my
case as I am a file server to the outside world over a 192Kb/s DSL link.
Other than that, I haven't heard of any fixes for the issues bewteen hard
drives and motherboards. I also have an A-bit KG-7 motherboard and do not
have the problem with it when using the same hard drives and cables.


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