Mailinglist Archive: opensuse (3336 mails)

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Re: [SLE] Funky DVD / Drive Behavior
  • From: Kevanf1 <kevanf1@xxxxxxxxx>
  • Date: Thu, 1 Dec 2005 15:02:04 +0000
  • Message-id: <7bca46c50512010702s75ecc157m@xxxxxxxxxxxxxx>
On 01/12/05, Randall R Schulz <rschulz@xxxxxxxxx> wrote:
> Hi,
>
> Recently I began to have trouble with YaST refusing to use the SuSE 10.0
> commercial DVD for new package installations. It claimed there wasn't a
> distribution on the device, though clearly there was, as I'd installed
> from it many times already. Examining it via the shell seemed to show
> everything being in order, but when I went to look
> at .../media.1/media, I got this:
>
> % cat /media/SU1000_001/media.1/media
> cat: /media/SU1000_001/media.1/media: Input/output error
>
> Since I have two DVD recorders in this system, I switched to the other
> one and when using that drive, everything's working fine. YaST will
> install from that drive and cat shows the expected contents of
> the .../media.1/media file.
>
> Experimenting further, I tried these commands:
>
> % dd if=/dev/hda of=/dev/null bs=4096
> 1048575+1 records in
> 1048575+1 records out
> 4294965248 bytes (4.3 GB) copied, 534.002 seconds, 8.0 MB/s
>
> % dd if=/dev/hdc of=/dev/null bs=4096
> 2082936+0 records in
> 2082936+0 records out
> 8531705856 bytes (8.5 GB) copied, 1089.81 seconds, 7.8 MB/s
>
> /dev/hda is the misbehaving drive and /dev/hdc is the one that works.
>
> Hda is a Sony DRU-720A dual-layer writer, hdc is an older Sony DRU-510A
> single-layer writer (both are capable of reading dual-layer media).
> Both are IDE drives configured as masters of the two separate IDE buses
> of my mainboard. There are no slaves on those buses and all other mass
> storage is on SCSI.
>
> It seems very odd that while no error was reported, reading stopped on
> hda after 4.3 GB while hdc when the full 8.5 GB. One might suppose that
> hda couldn't handle the layer switch yet reported no error when it
> should have done so.
>
> Another oddity I noticed when conducting these experiments was high CPU
> usage when accessing hda. It turns out its DMA had gotten turned off
> somehow. I reenabled it and ran the test again. Aside from going about
> twice as fast, nothing changed.
>
>
> Has anybody seen symptoms like this? Can you shed any light on what
> might have happened to the malfunctioning drive to account for these
> peculiar symptoms?
>
>
> Thanks.
>
> Randall Schulz
>
> --
Personally, my suspicions would be with the laser lens. Maybe its
calibration has gone awry or something? That's purely off the top of
my head...


--
==============================================
I am only human, please forgive me if I make a mistake it is not deliberate.
==============================================
Take care.
Kevan Farmer

Linux user #373362

34 Hill Street
Cheslyn Hay
Staffordshire
WS6 7HR

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