Hi Rabee,
as SiteScope can monitor each and every counter provided by the OS via the PDH library.
I actually don't think that the Windoes Resource Monitor reports a disk metric in bits, but bytes ;-)
SiteScope offers a way to measure these metrics via the Windows Resources Monitor,
Collection method : Microsoft Windows PDH Library
..
Available Counters
Objects : PhysicalDisk
Instances
check _Total
Counters :
whatever you are interested in, most likely
Avg. Disk Bytes/Read
Avg. Disk Bytes/Write
or
Disk Read Bytes/sec
Disk Write Bytes/sec
Greetings
Siggi