Sorry, it's a cluster. There are 7x750Gb drives that shows up as one 4.1Tb drive in the Disk Utility. So, total there are 28x750Gb that shows up as 4x4.1Tb in Disk Utility. Hope that explains it better.
My wish though is to have a mirrored drive of 8.2Tb (considering the grand total is 16.4Tb)
I can't seem to get it that way.
Thanks!