From owner-freebsd-hackers  Wed Feb 20 13:20:42 2002
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Date: Wed, 20 Feb 2002 13:18:42 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Cc: Terry Lambert <tlambert2@mindspring.com>, sos@freebsd.dk,
	freebsd-hackers@FreeBSD.ORG
Subject: Re: Serverworks ATA controller & data corruption
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basically yes.
there is a CRC on the disk block right?


On Wed, 20 Feb 2002, Andrew Gallatin wrote:

> 
> Terry Lambert writes:
>  > > So.. Is PIO safe?  Is there any sort of CRC being done on PIO data?
>  > 
>  > He just said: if your chipset is programmed correctly
>  > by the BIOS, then there will not be a problem, but
>  > apparently, there is a very narrow band of "correctly"
>  > (perhaps even only a single state), and the vendor
>  > apparently does not default the chip into that state.
> 
> I was asking a more general question about ATA -- I know that UDMA has
> has some sort of CRC protection because (on other machines) I've seen
> the occasional error about a bad CRC, retrying.  But what I don't know
> is if PIO offers the same protection. 
> 
> Drew
> 
> 
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