I’m jotting this down so I don’t forget this later. I needed to create a fresh CentOS 6.7 VM for a project I’m working on. I had mounted the DVD image and presented it to the virtual machine and told it to boot. The vm happily replied with:
EDD: Error 8000 reading sector 535681
No DEFAULT or UI configuration directive found!
What I should have done was md5sum the ISOs after downloading and copying them to the ESX server. I would have realized that the md5s didn’t match because the files had been truncated when I ran out of disk during the scp. When I landed the DVDs to a filesystem on the server that actually had room for the media, the problem cleared up.