Was there ever an answer to this?
I've seen dozens of complaints about this problem (with no answers), and I'm having it on disks I purchased that arrived today.
No, no answer. I stopped the installation and rebooted, reinstalled,
worked like a charm.
Interpublic Group of Companies
Yeah, that didn't work for me.
So, I booted a second laptop in target mode, inserted disk 2, attached the second laptop to my first laptop via firewire, and read both disks at once. It worked.
Necessity is the mother of invention ...