Disk Utility Software RAID - can I RAID only two of four drives?

[maxiedaniels]

If I have a bay with four drives in it, can I software RAID two drives only? Or do I have to RAID the whole thing?

 

[westrock2000]

Nope you can raid anything you want. If OSX recognizes it as a valid drive, it can be pooled.

I have 5 USB drives put in concatenated mode.

This guy did it with floppy drives.....
http://macguild.org/raid.html