There should be a repeating pattern to the beeps, i.e. one long, two short; two short; three short, etc. It's a fault code that can tell you what the problem is. Can you tell what the pattern is? It's obviously related to the drives but that still leaves a lot of possibilities.
Is it only when both drives are connected? Or do you get the beeps when each is hooked up separately? Are you able to boot to your BIOS?
Need more information. The specifications of your build might be helpful also.