Date: Wed, 27 Dec 2006 20:26:37 -0800 From: Doug Barton <dougb@FreeBSD.org> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-current@freebsd.org, sos@freebsd.org Subject: Re: Lots of READ_BIG errors on my new cd drive Message-ID: <4593477D.7020509@FreeBSD.org> In-Reply-To: <459315F0.3060809@mac.com> References: <459310D6.3070107@FreeBSD.org> <459315F0.3060809@mac.com>
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Chuck Swiger wrote:
> Doug Barton wrote:
> [ ... ]
>> I get a lot of errors that look like this:
>>
>> acd0: FAILURE - READ_BIG HARDWARE ERROR asc=0x3e ascq=0x02
>>
>> On CDs and DVDs that I've recorded on other drives, that I've recorded
>> on this drive, and commercial ones.
>>
>> Any ideas on where to start looking?
>
> Does toggling:
>
> hw.ata.ata_dma="0"
>
> ...in loader.conf make a difference?
I think you mean hw.ata.atapi_dma, and no, even with both set to 0, it
still gives the same error.
> I'd imagine you'd like DMA to work but knowing whether the problem goes
> anyway with DMA off is useful to test. For that matter, does a careful
> application of compressed air to remove any dust or lint inside the
> drive help?
It's a brand new laptop, so I can see the lens, and it's not dirty.
> Also, is this problem specific to -CURRENT or reproducible elsewhere?
I can try 6-stable on the same laptop and get back to you.
Doug
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