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Old 06-15-2006, 06:26 PM   #1
Wulfrunner
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CDRW/DVD Combo Drive, DVD Not Mounting


Hello,

I have an LG CDRW/DVD Combo Drive in my IBM 300PL running Zenwalk 2.6 (Slackware variant) and a custom 2.6.16.19 kernel. I am able to mount, read, and write CD's; but I am unable to mount DVD's. I have done extensive background research, and it seems like a lot of other people have encountered similar problems with no real solution. Basically, when I put a DVD in the drive, I hear some weird buzzing sounds as it tries to read, followed by failure; I have attempted to mount DVD's manually, but get the error message "mount: no medium found".

I THINK the problem is that the drivers (?) for the DVD are not being correctly loaded; there is only one directory in /proc/ide/ that refers to the CDRW/DVD drive, and it's a cdrom driver:
Code:
root[~]# cat /proc/ide/hdc/driver
ide-cdrom version 4.61
Code:
root[~]# dmesg | grep hdc
hdc: HL-DT-ST GCE-8525B, ATAPI CD/DVD-ROM drive
hdc: ATAPI 52X CD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
I am not sure if I am even looking in the right place, but any advice or pointers would be appreciated.
 
Old 06-15-2006, 11:18 PM   #2
binary_y2k2
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Do you have UDF builtin or as a module in the kernal, It looks like your system isn't able to read the FS.
You may have to look at the config file for the kernal. Also you may need udftools package.
 
Old 06-17-2006, 11:43 AM   #3
Wulfrunner
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Quote:
Do you have UDF builtin or as a module in the kernal
Thanks for the reply: I have UDF support built in to the kernel. The package udftools is not helpful for this problem.

Should there be a separate device for the DVD reader?--there is only one device for this piece of hardware. Perhaps the system does not know that this device can read DVDROMs and is trying to read them like CDROMs? I am not sure if I am even on the right track.
 
Old 06-17-2006, 11:48 PM   #4
binary_y2k2
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It shouldn't matter what device it is. On my system I have /dev/cdrom, cdrw, dvdrom and dvdrw which are all links to /dev/hdc. It may have something to do with the hardware, or maybe your DVD combo only reads DVD + or - .
You could try using dd to make an image of a DVD and see if you get any I/O errors, if not, can you mount the image?
 
Old 06-20-2006, 12:13 PM   #5
Wulfrunner
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Registered: Jun 2006
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dd will not work to create an image:
Code:
dd: opening '/dev/hdc': no medium found
This is the same error message I get when trying to mount the DVD normally:
Code:
root[~]$ mount -t udf /dev/hdc /mnt/cdrom
- or - 
root[~]$ mount -t iso9660 /dev/hdc /mnt/cdrom
mount: No medium found
This suggests to me that:
  1. There is something wrong with the medium, which is unlikely because I have tried multiple discs that are known to work in other DVD drives,
  2. The system is not identifying that the disc is a DVDROM (not a CDROM) and is using the wrong hardware instructions (?) to read the disc,
  3. The hardware is broken and will never read a DVDROM again, although I think this is unlikely because I remember being able to use the drive under different operating systems.

I am still trying to find a solution on my own, but any further assistance would be appreciated.
 
Old 06-21-2006, 04:57 AM   #6
binary_y2k2
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When looking up Zenwalk I noticed that there are 2 versions, the full and the "core". If you only installed the "core" then you may not have out-of-the-box support. Although this is a whiled guess here. To make sure it's a software problem, you could download a dvd ISO and try to mount that.
Also I just looked at my dmesg output for my CD/DVD-RW
Quote:
hdc: HL-DT-STDVDRRW GWA-4083B, ATAPI CD/DVD-ROM drive
hdc: ATAPI 40X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache, UDMA(33)
It looks like your kernel isn't even recognizing it as a DVD drive?
 
Old 06-22-2006, 09:48 AM   #7
Wulfrunner
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Registered: Jun 2006
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Distribution: Zenwalk 2.6
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I followed your advice and downloaded a DVD iso. I was able to mount it without any difficulty. I am almost certain that this is a hardware problem now because when I inserted a bootable DVD and restarted, it failed to read and the drive made some angry noises. Thanks for taking the time to help me out with this but I guess I will have to get another drive.
 
  


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