On windows, I'd like to do a raw read on a full physical volume. Can anyone point me in the right direction?

To clarify, I'm not trying to read a file system, or a partition. Just the whole physical volume. I'd like to pipe that into a script.

In Linux, which I'm more familiar with, I'd do something like:

Cat /dev/dvd | whateverprocessing

Pointers anyone?

Bb