Fedora 12 and MD5sum

[IYIaster]

I've been using a script to compare the MD5sum of a CD and the ISO used to burn the CD. This script works great in Fedora 8 but in Fedora 12 it returns a different check sum for the CD and ISO. Any ideas would be greatly appreciated.

#Compares the checksums of an iso9660 image and a burned disk.
#This script is released into the public domain by it's author.
if [ -n "$BASH" ]; then
shopt -s expand_aliases
fi

if [ -n "$CHECKSUM" ]; then
alias CHECKSUM="$CHECKSUM"
elif which md5deep > /dev/zero; then
alias CHECKSUM='md5deep -e'
else
alias CHECKSUM='md5sum'
fi

if [ -n "$2" ]; then
DISKDEVICE="$2"
else
DISKDEVICE='/dev/cdrom'
fi

CSUM1=`CHECKSUM "$1" | grep --only-matching -m 1 '^[0-9a-f]*'`
echo 'checksum for input image:' $CSUM1
SIZE=`stat -c '%s' "$1"`;
BLOCKS=`expr $SIZE / 2048`;
CSUM2=`dd if="$DISKDEVICE" bs=2048 count=$BLOCKS 2> /dev/zero | CHECKSUM | grep --only-matching -m 1 '^[0-9a-f]*'`
echo 'checksum for output disk:' $CSUM2

if [ "$CSUM1" = "$CSUM2" ]; then
echo 'verification successful!'
else
echo 'verification failed!'
fi

[IYIaster]

No one knows why the md5sum isn't working on fc12?

[IYIaster]

running these two commands in fc 8 returns the same checksum

md5sum /data/backups/prior/backup052110.iso |grep --only-matching -m 1 '^[0-9a-f]*'

dd if=/dev/sr1 bs=2048 count=182 2> /dev/zero | md5sum |grep --only-matching -m 1 '^[0-9a-f]*'

But, running them in fc12 it doesn't return the same checksum. I really don't understand why.