How can I set two disks with ICH9R Controller?

In ICH9 Controller I have raid 0 from four HDs.

Then it shows as one. From the controller (Cntl + I), I see bellow the four HD, then above the one big HD as one disk.

I wish to separate the one HD to two, so windows see it as two disks.

How to do it?

This is an alternative to another question I have asked:

Recover data from RAID0 with Intel Matrix Storage Manager

So I try another phase as an alternative.

My issue is not solved. and I believe that with Intel I could find solution.

Thank you,

Isaac