I have seen this a couple of times when installing RHEL - was never really bothered about it as I never really run into any problems once the os is installed.
I always thought it might be a read error but now I got the same error on a server which just mounts the iso onto a remote administration card (ipmi) and I had the same error when installing RHEL desktop.
So I am wondering if this is a 5.3 bug of some sort.
RedHat support also says its "just" a read error but it is quite a coincidence that I receive the same error on both, server and client OS whether I install it from an iso or a burned media ..
Just wondering if I am the only one seeing this, if this is the case then I might as well just download the iso again.