Simply copy your data off or make an image and disable RAID. When you boot you will have two (unusable) HDD's. Then simply partition and/or format.
Moving from RAID (which typically indicates spinning drives) to an SSD, you should perform a fresh installation of Windows (especially with Win7). There are several settings required for the SSD to perform properly that are set during installation.
Moving from RAID (which typically indicates spinning drives) to an SSD, you should perform a fresh installation of Windows (especially with Win7). There are several settings required for the SSD to perform properly that are set during installation.