OP, the usual way that RAID systems (using the mobo's built-in features) work is that the SATA system may be set to RAID mode, but then there is a separate RAID configuration system. NOT within the BIOS Setup, but accessible by pushing a specific key when prompted on-screen by the POST messages, the RAID configuration screens have all the tools for managing your RAID arrays. The key for what you want is to recognize that NO drive is used for any RAID system unless you specifically tell it to do so within these screens. SO, in your case, once you install the new HDD in your machine, it STILL is NOT a RAID drive - it is just a separate "normal" drive.
In fact your issue is the same as anyone else who has just added a HDD to their machine. The unit needs to have two operations on it - Partition and Format - before Windows can use it. Some call these two together Initialization. The tools for it are built into the Disk Management utility in Windows, which jitpublisher referenced above. If you get there and look at the LOWER RIGHT panel of Disk Management (it scrolls) you will find a large horizontal block representing this new piece of hardware, probably all marked as Unallocated Space. To start, RIGHT-click on that space and use the mini-menus to Create a Partition and then Format it. Alternatively, as treefrog07 advised, get a utility from your HDD manufacturer's website that does this job for you easily. When done you must reboot for Windows to catch up to the changes you made.
sirrsewmo, you can always copy from one disk to another. Yours is a more complex request but should be do-able IF two conditions can be met:
1. Can you set your BIOS to boot from a USB device?
2. You will need cloning software to make an absolutely complete and bootable copy of your current boot drive (the RAID0 array) to the USB drive. NOTE that this normally means that you will wipe out - that means, LOSE! - all data currently on the USB drive unit. (Making a bootable clone to a separate Partition on an external drive while preserving its contents in its original Partition is a bit more complex.)
If you can meet those requirements, this can be done. The key tool you will need is the cloning software. Acronis True Image is a good choice, and there are others. You may get a free customized version of it from a HDD manufacturer. Seagate, for example, will give you Disk Wizard on their website to use for cloning TO a Seagate drive. I suspect (cannot verify from personal experience) that it also would work for cloning TO an external Seagate unit. If your external is from WD, their free package is called Acronis True Image WD Edition. If you have another company's external, check whether their website has a similar free utility for cloning. But the Acronis product you can buy separately will work anyway.
So you should be able to make a clone to the external unit, ensuring that it is made a bootable drive. Then if you can set your BIOS to boot from that unit you're golden. Now, why did you want to do this? You indicate you want to "remove the RAID...". I presume you mean you want to break up the array and use the two drive units as plain separate HDD's from now on. Would you plan to restore all the former C: drive data (now residing on your external unit) to one of those newly-separate internal units and get back to using it as your boot drive? That will involve using cloning software again to make the second clone from the external to an internal drive.
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