I have 3 120 gigs hard drives divided in half, My drive with the OS and cd still workes but 2 phisical drives have been lost my PC can't find them they were there a hour before and no changes made to them I think it may be cables or controler how do I fix the latter or is there something I should look at?

Since both went at once, I'd first guess a cable issue.

Shut down, open er up, and disconnect and re-connect each one.

Try it and let us know if they're still not showing up.