I had been noticing for many months now that certain udf discs were not being mounted by fedora 8.

Giving Message:
mount: block device /dev/sr0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so


Earlier i had thought it just to be defect of my drive but after my drive got replaced and after installing fedora 9 i decided to check up and voila !!This bug has been reported in nearly all distros.(well duh since kernel has bug)

Solution: Rebuild Kernel with a patch (PS This is for kernel-2.6.25.3-18.fc9) For Other Linux Distros Download your kernel source)

1. Download and prepare the kernel sources


yum install yum-utils
yumdownloader --source kernel
yum install kernel-headers

2. Download the kernel source :kernel-2.6.25.3-18.fc9.src.rpm

yum install rpm-build m4
rpm -ivh kernel-2.6.25.3-18.fc9.src.rpm
cd /usr/src/redhat/SPECS
rpmbuild -bp --target=i686 kernel.spec
cd ../BUILD/kernel-2.6.25/linux-2.6.25.i686/
cp configs/kernel-2.6.25.3-i686.config .config

3. Download UDF PATCH (click here) Check here for Main Page
4. Patch the kernel source:


cp /tmp/UDF_2.50-linux-2.6.25rc1.patch.bz2
bzcat UDF_2.50-linux-2.6.25rc1.patch.bz2 | patch -p1


5. Edit Makefile:

change EXTRAVERSION to  which-ever kernel you want.(BE SURE ABOUT THIS)

EXTRAVERSION=.3-18.fc9.i686

6. Build the kernel modules:

make modules

7. Save original udf kernel module

mv /lib/modules/$(uname -r)/kernel/fs/udf/udf.ko /lib/modules/$(uname -r)/kernel/fs/udf/udf.ko.orig

8. Copy new udf kernel module to modules directory and load it

cp fs/udf/udf.ko /lib/modules/$(uname -r)/kernel/fs/udf/
modprobe udf
modinfo udf

If the same message still comes go through the procedure again.
For any kind of help, please post in Support and Questions