First off, either use a terminal program other than HyperTerminal or use HyperTerminal's text capture feature instead of a copy-and-paste from the scrollback. Those corrupted logs are a bear to read. (You know, HyperTerminal's only been a part of Windows for 10 years now. Maybe it's time to fix those bugs.)

That said, the read_intr messages point definitively to a hardware problem. Go through the "No hard disk found" FAQ and see if any of those troubleshooting methods help.