I know software raid stinks. I did not set this server up. One of the drives is failing,,so I broke the mirror,,,took it out. shut it down and put it in a new drive of the same size, make, etc. ONly difference is new one is s little faster.. Add mirror is greyed out. Tried reformatting, adding voulume,,,no luck. I put the old drive back in as its still working. Now I have 2 different drive letters ( from breaking mirror) and still the "add mirror" is greyed out. Both hard drives are in place with all the same info on both. Hoping it works okay tomorrow for the users. Any thoughts on how I can replace the bad drive and get the "add mirror back.