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I have four Hard Drives and four partitions C, D, E, G. Partitions C, E and
G in one physical HD and it is mirror. Partition D is in another physical
unit and it is also mirrored. I just replaced one of the D HDs. I broke the
mirror and reestablish it with the new HD. The new HD has letter in red and
I do not know what it means. Could some body elaborate on this?

Thank you in advance for your help!