I'm not too sure but, as per, check the different project settings. For the I/O error, are the display settings set to display on monitor only or monitor and source? Make sure it's set to Monitor only as it may be because it's not picking up a source (camera, capture deck, etc).
As for the Disk Error i'm at a loss, I'm afraid. Sounds more like a hardware/OS settings problem than something you'd find in Premiere... Have you tried moving files from one drive to another in Windows to see if the problem is in the system with drive connections?

Cheers,
Rich