i was wondering if there is a way to have a 1tb and a 500gb in raid0, ie. only 500 gb of the 1st disk will be a part of the raid, but still get to use the remaining 500 gb, atleast at normal speeds( not as high as the speed of the portion thats in raid)?
Whether you can use the extra storage would probably depend on your controller. For pure windows/software raid, I think it's possible, hardware raid less likely, but check your documentation.
You would affect the speed of the raid 0 though, because if the non-raid part of the 1tb was being used, it would delay access of the raid partition, and negate some of the benefits of the raid 0 array.