Since I have the system installed, at least now I can give a precise
"dmesg" output. I'll include it below. As you will see, this system
has a primary and secondary IDE bus. The primary has 2 disks
attached. The secondary has the CD drive as master and another drive
as slave. The system is installed on the primary master drive. I
also tried the primary slave drive and that works. I made a limited
test on the drive on the secondary slave and it seems to work, so it
looks like only the CD drive (secondary master) is throwing errors.