I am using 160gb hdd before just got my 2nd HDD(Seagate 500gb Sata ), i tried to instal it but its detected only 1 HDD
My question is :
do i have to use RAID?
Which Raid setting should i use? Mirroring? Stripe? Stripe Mirroring?RAID 5?

Sorry Noob here,

Thanks for your time