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DVD/CD-R/RW reading problem with R5A12
http://forum.linhes.org/viewtopic.php?f=2&t=4004		 Page 1 of 1
Author:  chodak [ Tue Mar 29, 2005 10:49 pm ]
Post subject:  DVD/CD-R/RW reading problem with R5A12
Well after some work getting Knoppmyth up and running, I can watch/record TV. Hooray! However, the next step is stumping me. I'm a Linux newbie, and I've read about every thread I can find about DVD/CD access problems, but my Myth box won't recognize when a CD or DVD is inserted, and when I select "Rip CD", MythTv just gives me a blank background until I hit ESC.

Here's my info:
Code:
root@mythtv:/home/mythtv# ls -al /dev/cdrom /dev/dvd /dev/hdc
lrwxrwxrwx  1 root cdrom     8 Mar 27 15:15 /dev/cdrom -> /dev/hdc
lrwxrwxrwx  1 root cdrom     8 Mar 27 15:15 /dev/dvd -> /dev/hdc
brw-rw----  1 root cdrom 22, 0 May  7  2004 /dev/hdc

Code:
root@mythtv:/home/mythtv# grep mythtv /etc/group
cdrom:*:24:mythtv,dan
audio:!:29:mythtv,dan
video:!:44:mythtv,dan
mythtv:x:105:


Any idea what's up? Let me know if you need any more info. I hope it's an easy fix and I'm just a dork. Then I can move on to setting up remote playback of my movie and music library!
Author:  tjc [ Tue Mar 29, 2005 11:13 pm ]
Post subject: 
Did you check to make sure that your DVD drive is actually on /dev/hdc? Search for posts by me within the last week which mention both dvd and hdc, you'll find a grep comand to run against the messages log which shows you what disks are where according to the hardware detection.

BTW - Everything else you've showed us looks OK.
Author:  tjc [ Tue Mar 29, 2005 11:19 pm ]
Post subject: 
OBTW - you understand this, right? http://mysettopbox.tv/phpBB2/viewtopic.php?t=3994

You may also want to read the MythTV docs: http://www.mythtv.org/modules.php?name=MythInstall
Author:  chodak [ Tue Mar 29, 2005 11:39 pm ]
Post subject: 
Sure enough, my DVD-RoOM was indeed hdb. Makes sense... as I only have two drives in the system. I wonder why Knoppmyth sets it up this way?

Thanks for your help tjc! Here's what I did to fix the problem:
Code:
rm /dev/dvd /dev/cdrom
ln -s /dev/hdb /dev/dvd
ln -s /dev/hdb /dev/cdrom
chmod +r /dev/hdb

Now my output looks like this:
Code:
root@mythtv:/home/mythtv# ls -al /dev/cdrom /dev/dvd /dev/hdb
lrwxrwxrwx  1 root root     8 Mar 29 23:31 /dev/cdrom -> /dev/hdb
lrwxrwxrwx  1 root root     8 Mar 29 23:31 /dev/dvd -> /dev/hdb
brw-rw-r--  1 root disk 3, 64 May  7  2004 /dev/hdb


And my CDs and DVDs work! :D
Author:  tjc [ Tue Mar 29, 2005 11:53 pm ]
Post subject: 
Knoppmyth didn't set it up that way, you did when you assembled the hardware and/or set up your BIOS. Linux maps PATA and SATA drive names by their controller "channel" according to the BIOS.
    hda - primary IDE master
    hdb - primary IDE slave
    hdc - secondary IDE master
    hdd - secondary IDE slave
    hde - first SATA (or tertiary IDE master or ...)

This may vary if you do something like tell the BIOS to swap the order so that the SATA drives appear first, but other than that it's generally true.
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