linux-kernel - Re: Possible problems reading a DVD-RAM disc

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Date:	Fri, 24 Aug 2007 21:06:31 -0400
From:	TheOneKEA <theonekea@...il.com>
To:	"Robert Hancock" <hancockr@...w.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Possible problems reading a DVD-RAM disc

Mr. Hancock,

On 8/24/07, Robert Hancock <hancockr@...w.ca> wrote:
> TheOneKEA wrote:
> > While doing a long mega-copy from one side of a DVD-RAM disc formatted
> > with the vfat filesystem to an smbfs network share, I got lots and
> > lots of these in the dmesg:
> >
> > Buffer I/O error on device sr0, logical block 4396
> > lost page write due to I/O error on sr0
> > sr 6:0:0:0: [sr0] Result: hostbyte=0x00 driverbyte=0x08
> > sr 6:0:0:0: [sr0] Sense Key : 0x7 [current]
> > sr 6:0:0:0: [sr0] <<vendor>> ASC=0x92 ASCQ=0x0ASC=0x92 ASCQ=0x0
> > end_request: I/O error, dev sr0, sector 17584
> > Buffer I/O error on device sr0, logical block 4396
> > lost page write due to I/O error on sr0
>
> Well, the drive is reporting an error on a write to the disc. It's not
> an error code in the MMC5 standard, though, so presumably it's a
> vendor-specific error code.

Would I be able to find a datasheet explaining the code?

>
> Not sure why it would be writing to the disc though.. Maybe if the disc
> is mounted read-write it is doing last-access-time updates or something?

It's possible - I didn't explicitly specify noatime when mounting the
volume; does the vfat kernel module honor the noatime option?

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