Help please! Disks not recognize properly while installing

[pc101fan]

Hi

 

I've got a strange problem that I don't understand

 

My mother board is Gigabyte GA-H77-DS3H, I set disk mode as RAID in bios and created a RAID0 array with two Seagate 1TB disk, and a 32GB MSATA SSD as Cache Disk(using Intel SRT).  And I created two HFS+ partitions for use of MAC installation

 

In Windows7 or other OS, The disks are detected as an array, but while i'm installing MAC 10.10, the disks are detected as three seperate disks with no partitions.

 

So I feel very strange. Why in MAC the RAID Array cannot be reconized properly but reconized as three seperate devices?

 

To save my data,I don't know what to do to install MAC without losing any data or partitions.

 

So, Could anyone tell me why?and could anyone give me any idea about this?

 

THANKS A LOT !!!