1. i would guess that D: is a separate partition on the "C" drive - i.e. drive was split into two - probably when the os was installed
2. You can swap drive letters using "disk management" - have to change one to say H first then move f to d and then d to f
3. To move its just a copy/move as you would do for any file - no magic involved - or add f to the pool and use the "quick and dirty method" to move the files into the poolpart directory
4. Nope os remains on c - cant move that
5. attached to computer power up - windows will see the new drive and then so will dp - just click add - few seconds later drive will be part of the pool.
Quick and dirty method http://wiki.covecube.com/StableBit_DrivePool_Q4142489