Xps gen 3

hello
i dont usually come here but i have some questions.
I have an XPS GEN 3 dell computer. I have taken it out of its original case and put it into another tower case. My problem is this. When i got it, it was configured it RAID 1 settings. Now i dont want it to be and i have 2 HDD's for it but it won't read my second one. What can i do?

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set them both cable select and fdisk the drives if you dont mind losing information. if you do, cable select on the back of the drive with the dual pin selector and change bios settings according