as mattvmotas said you need to make the BIOS categorize the the drive as a single or broken mirror, and than you "should" be able to see it on another drive.
you might also try Runtime's getdataback for NTFS (or their RAID reconstructor) from another machine and see if you can get a decent recovery if your not able to access the RAID bios, or if the Information is too important to take any risks with.