When CentOS DVDs are loopback mounted on a running system, several of the files are owned by UID 500, which show up as either "500" or whatever username has UID==500 on the current system. It most likely doesn't affect installs and purely cosmetic, but could be confusing if files are copied from DVD media to populate a local mirror, etc.<br />
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Note that this differs from upstream images; I suspect upstream uses "-r" in the mkisofs command, and CentOS uses "-R". (See "-r" option in mkisofs manpage). Suggest using "-r" in the mkisofs command for CentOS media.
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