help with pagefile

I want to modify my pagefile. Currently it is on my C drive; initial
1536 max 3072, but recommended size is 4606mb
I aded RAM since the system was first set up

So I want to add another pagefile to my D drive which I do not use
much at all.

What size should I make the pagefiles, and for the one on the D drive,
should I put it in its own partition? Currently the drive is not
partitioned, has 16.9G used and 215G free.
there are three folders I can see on it:
MSO Cache 0 bytes
RECYCLER 178 Kbytes
System Volume information 0 bytes
What is recycler? some backup program my wife downloaded?

Thanks