I used to have mirroring setup on my Windows 2000 server. I broke the mirrors when I did an OS update. Now I cannot reestablish the mirrors. Help says:
1.Open Disk Management.
2.Right-click the unallocated space on one of the dynamic disks where you want to create the mirrored volume, and then click Create Volume.
3.In the Create Volume wizard, click Next, click Mirrored volume, and then follow the instructions on your screen.

In step 3, "Mirrored volume" is disabled on my system.

The Hard drives are identicle models.
Any clues?