When I mount the DVD-ROM the os crashed

Hi guys!
when I mount DVD-ROM to some files from xterm, the systerm never responsed!
I used this command:
sudo mount -t iso9660 /dev/cdrom /mnt/cd
I search some info from google ,some guys say these info may help ,but I don't understand why it cab be crashed
when I mount the CD from DVD-ROM.
/etc/fstab
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto 0 0
lrwxrwxrwx 1 root root 3 05-22 19:54 /dev/dvd -> sr0
dmesg |grep hd
[ 9.126848] hda_codec: Unknown model for ALC883, trying auto-probe from BIOS.
thanks for your help!

I just try again , this time i run the command in the tty2
mount -t iso9660 /dev/sr0 /media/cdrom0/
and the command stay for a while , and then no response again.
this afternoon I try this command in Ubuntu on my friend's mechine it work successfully!
my DVD-ROM work fine on XP ,the CD is good!
I only find this in the log file
May 23 19:56:49 king sudo: king : TTY=tty2 ; PWD=/media/cdrom0 ; USER=root ; COMMAND=/bin/mount -t iso9660 /dev/sr0 /media/cdrom0/
which log file can I find more useful messages?

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LONG LONG LONG LIST
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PART One.
Use of strange video/audio material e.g. .avi, .wmv, .mp3 etc.
I only use.
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Audio - .aiff (as on audio-CDs) (else converted to this .aiff 48KHz)
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Chapters !
A. Using strange letters in video project name e.g. +,/; etc. keep to a-z and 0-9 strange letters in project name e.g. +
as described by Donnyboy69. Does the title of your project have any symbols or decimal points in it. If so, that is why you are getting the error. I had a project that had a + sign which caused the same problem. I renamed it without the symbol and low and behold, it worked.
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Important when from iMovie HD6 or previous - Now also observed when using FCE 4
PART Two.
from Robert Modero.
"Multiplexing Error. Problem during initialization of tracks"
Simply remember to add subtitles to your Quicktime files and menu buttons.
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from Boise Jim
Do a safe reboot (by holding down the shift key until you see the spinning gear on gray background, then release, then restart when your start-up screen appears).
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I use only - Verbatim DVDs
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3 Chapter marks in transitions - minimum 2 sec from
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To add my experience with Multiplex Errors using iDVD (7.0.4), I recently created two iDVD projects
Video from both passed from FCE 4.01 with chapters
One project worked fine in creating disk image file
The other gave Multiplex Errors
I tried suggestions to remove special characters and no chapter marks at beginning, but nothing worked
Note that I've used iDVD for dozens of projects and this is first time I've run into Multiplex Errors
Anyway, for problem project, I tried an experiment where I removed all chapters in FCE and passed to new iDVD project
This time multiplex errors gone
So had something to do with chapters
So now I tried numerous experiments to remove individual chapters and try again creating disk image with new iDVD project
After numerous tries, I was able to narrow problem down to 1 "Bad" chapter mark
That is, when I left the "bad" chapter in my FCE project and passed to iDVD, iDVD gave multiplex error
When I removed "bad" chapter mark (and others in), no multiplex error
As a final experiment, I moved "bad" chapter mark about 5-10 sec's beyond original point and passed to iDVD, the multiplex errors now magically went away and I was able to finally create my disk image.
I have no idea why this worked, but thought I'd mention here in case someone else runs into similar problem.
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In addition to Bengt's fine advice, burning errors can occur if you have located any of your menu buttons wholly or partly outside of the safe TV viewing area. Go to your main project menu, then click on View/Show TV Safe Area, to check. Drag into the safe viewing area any buttons that are outside the safe viewing area.
Russ One - suggest this
Multiplex Error-There was an error during muxing preparation
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• Only A to Z and 0 to 9 in chapter title
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• No Chapter mark in or within 2 seconds from any transition in movie
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