I'd question how much the raid 0 setup would really improve times, because the idea of a raid 0 setup is that it uses 2 separate drives, storing data on both, and when data is called the drives simultaneously launch data at whatever is calling it. When you use a single drive split into 2 logical drives, it still has to go through the same connection which I would think would limit the speed improvement.
Unless somebody has some hard numbers, I think the only way to see would be to reinstall your OS and get rid of the 2 logical partitions making it a single drive again. Or just buy a new storage hard drive, prices are cheap enough that if you can afford a SSD you should be able to buy a 1tb drive for like 80 bucks
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