linux-kernel - Re: NEC ND-4550A problems reading DVD-R

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Date:	Tue, 01 Mar 2011 10:47:41 -0500
From:	Stephen Clark <sclark46@...thlink.net>
To:	Mark Lord <kernel@...savvy.com>
CC:	Tejun Heo <tj@...nel.org>, Krzysztof Halasa <khc@...waw.pl>,
	linux-ide@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org
Subject: Re: NEC ND-4550A problems reading DVD-R

On 03/01/2011 08:48 AM, Mark Lord wrote:
> On 11-03-01 03:01 AM, Tejun Heo wrote:
> ..
>    
>> I think that's determined by drivers/scsi/sr.h::SR_TIMEOUT which is
>> hardcoded to be 30 seconds.  Maybe it's better to move it to use the
>> block parameter.  Anyways, the drive actually takes longer than 30secs
>> to recognize the media?
>>      
> That slow behaviour is not uncommon, especially as drives struggle
> to recognize various forms of copy-protected media (DVD-Video).
> A longer default, or tuneable timeout, would help.
>
> Cheers
>
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>    
I agree with Mark, this should be a user tuneable value. My 2006 LG 
dvd-rw frequently times out
trying to identify the media. But after numerous timeout error messages 
it usually suceeds.

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