I bought 2 Lenovo thinkstation E31 and I want to set up `RAID` 1 on them.

I added a hard drive for each. I went in the BIOS and set it to `RAID` then I pressed `ctrl-l` to start the raid manager but it disappear after 2 seconds. I don't know if it's because Windows 7 is already installed but in the user manual it says that the `RAID` will only works for windows 7 users so I installed it first with the lenovo partition.

I read on forums that setting `RAID` formats the disk but I got the secret partition and I don't wanna lose it. Also, in windows 7 when I go in computer, I don't see the second hard drive and the Intel hard driver manager pops up saying I got an another drive ready. 

From that, I can set the `RAID` but will it be a software `RAID`? I would prefer a hardware `RAID` cause it's faster.

Does anyone can explain how I could get the hardware RAID or why the `ctrl-l` windows doesn't work.
Thank you