Is there an application that can monitor real time transfer rates between hard drives and partitions, RAID and non RAID, internal and external drives?
Use the built-in "Perfmon" utility, which has always been part of NT-based Windows systems even though they've added additional tools such as Resource Monitor. To run it, click the "Start" button, type "Perfmon" into the search box, and hit <Enter>.
To use it, click the big red "+" button and select the performance counters you want to view. "Logical Disk" shows I/O counters for drive letters, which correspond to partitions. "Physical Disk" shows I/O counters for each separate device.