Dell Precision 490

Hi,

I'm trying to upgrade this computer so that I can use if for music. I took one of the 300gb hard drives out and replaced it for a 2tb - I didn't realise the drives were raided. How do I turn raid off and use it normally.

Also does anybody know the memory cards that are supported - it currently has space for 8 - however there are 4 1gb memory cards currently installed.

Many thanks
 - please reply asap

Rob