All members of a RAID 1 volume set must be on a dynamic disk.
To create a RAID 1 set in Windows 2000 (it should be fairly similar to XP), complete the following steps:
1. From the Start menu, select Programs, Administrative Tools, then the Computer Management Microsoft Management Console (MMC) snap-in.
2. Expand the Storage branch, and select Disk Management.
3. Right click the partition you want to mirror, and select Add Mirror from the context menu.
4. Select the disk that will host the mirror, and click Add Mirror.
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5. If you mirror the boot partition, a dialog box details the changes that the program will make to boot.ini to enable mirror booting. Click OK.
I'd recommend NOT going with a RAID if using Windows to accomplish this. It's not very efficient and it's not very reliable. Trying to troubleshoot out of sync mirrored partitions can be a lost cause. Unless you absolutely have to - I'd recommend other alternatives such as a backing up your system.