CHKDSK on Mirrored Drives

[Dan]

I belive one of my mirrored drives has a bad block. I
want to run chkdsk /r to repair the damage.

Since the drives are mirrored, when I run the command,
which drive will get checked?

If I break the mirror how do I specify the second drive?
Will it have a letter? (I have never broken the mirror,
nor did I create it)

How would you recommend checking and repairing?

Dan