Due to it being SATA, it shouldn't matter where they are plugged in.
I believe the drive that gets used as the print spool is not accessible in Windows, but it is simply too long ago to remember if that is for sure.
I have a CX260, but it is entirely different apparently, as seen here, and while not helpful, they are hooked up bottom left, bottom right, upper right (going out to in on the drives)
