2 hdds in raid 0 for the os, the rest as normal drives with games, films ect
for this would i need a second controller? or can windows 7 see the none raid disks left on the controller
Windows-7 sees what the motherboard and bios sees. What motherboard do you have? I think they all will allow you to have both raid and non-raid devices attached.
But... Raid-0 is not very effective for the OS. The OS does lots of small random reads and writes. Raid-0 allows two drives to do sequential processing of large files well. You might want to read about raid-0 here:
You can mix sata1 and sata 2 devices without any problem.
Sata 1 and sata 2 refer to the speed that data from the hard drive buffer can be transmitted to the motherboard.
Today, no conventional hard drive can transfer data from the drive at even half of the sata 1 capability, much less sata 2.
Only the fastest of current SSD's today can saturate the slower sata 1 bus.