OK!  I have found a fix for this problem!!!  (actually found the fix in
one of the fedora forums)

Let me first clearly define the problem that I am fixing:

Conditions:

1.  CD/DVD/CDR/CDRW disks "unmount" themselves shortly after mounting.

2.  dmesg reports the following - VFS: busy inodes on changed media or
resized disk sr0

3.  I currently have no entries for either drive in /etc/fstab...  The
problem was exactly the same when I had the "/dev/sr0 /media/cdrom0
udf,iso9660 noauto,users 0 0" or similar lines in /etc/fstab.

4.  Once one of the drives "unmounted", only a reboot would allow me to
mount again.

5.  All other devices and drives mount normally (and stay mounted with
no issues)..

6.  My relevant hardware is: Asus P5N-e motherboard, 
cdrom:0 :: description: DVD-RAM writer :: product: CD/DVDW SH-S182D  
cdrom:1 :: description: DVD-RAM writer :: product: CD/DVDW SH-S182D

Both drives are run off the secondary ide channel.

7.  The hardware (motherboard and drives) is guranteed to be functional.
I could not get either drive to fail in WindowsXP during overnight
testing.


FIX::

Add "acpi=off" to the kernel load line in /boot/grub/grub.cfg then reboot...  
For example:
linux   /boot/vmlinuz-2.6.32-24-generic 
root=UUID=c82dfc28-0bcf-48a6-995f-b61464bcf056 ro   quiet splash acpi=off

I have gone through 2 days of stress testing the drives and neither has
unmounted AND there are no more errors in dmesg...

TO DO:
1.  Get more users to confirm this fix.
2.  Submit the data to the ACPI team if it looks like the fix is repeatable.

Take care,
Sheldon

-- 
Cdrom drive not recognized automatically
https://bugs.launchpad.net/bugs/562092
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