Fedora :: Verifying Files Written To A DVD?

I've been having trouble writing to DVDs on one computer, and I am trying to figure out whetgher the problem is hardware or software related, or, perhaps, both. The brasero CD/DVD writer puts the md5 checksums of each of the original files in a hidden file on the DVD. I think it then calculates the sums of the copies and compares, but the last time I did it, it told me it had permission problems with the drive, and that failed. When I put the DVD in, udev finds it and mounts it in /media with me as its owner. Apparently, brasero mounted it some other way, and presumably that caused the problem.

Secondly, after I brought it up again, I went into the /media mount point and did md5sum on the files there. One of them a gzipped tar file, produced and input/output error. Yet if I use cmp to compare that file with the original it finds no difficulty. So what is going on? Finally, I have tried to write shell scripts which use cmp to compare the original files with the copies. The general form is

cd XXXX
find $* >> /tmp/X
for i in `cat /tmp/X`
do
cmp $i YYYY/$i
done

where XXX is the mount point in /media and YYY is the original directory containing the relevant files. This works fine except that if the file names have spaces in them, the shell script treats each word as a new file name. So I need some way to arrange things so that `cat /tmp/X` returns the complete file name. Nothing I've tried works.