I run a RAID 0 array with 2 x 320GB HDDs. I have created 2 partitions of approx 300GB each with DD10 and have Win XP Pro SP2 as my OS on the C: partition (Primary / Active). I want to install Win Vista HP x64 on the newly created F: partition (Primary). I am confused whether it is easier / better to install Vista from the Win DVD in the normal way from boot up(assuming it will pick up my DD10 partitioned RAID 0 array) during the installation process or whether to use OSS from within XP or from the DD Boot CD I have created. I will use XP most of the time and Vista for DX10 gaming. My router is not supported by Vista and I won't be able to access the Net from Vista so most of my time will be spent with XP. I am confused about hiding partitions in OSS if it is used to install the second OS. Also, what happens when i am in Vista and want to get back to XP? Do I have to install DD10 on the Vista partition? I like the idea of using the standard Windows Boot Loader which I assume will start every time I power on the PC. I assume I can simply select between XP (Earlier Version of Windows) and Vista and simply reboot when i want to change. I have made a back up of the XP install using TI. I'm really after an 'Idiot's Guide' to dual booting with RAID 0 and using either OSS or Windows Boot Loader. I am after the solution that is likely to cause the least installation issues! Any help would be greatly appreciated. Many thanks.