Changes

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If one of the disks in a mirrored set fails the good news is that, unlike striped volumes, all the data is still present on the remaining healthy disk (this, after all is the whole point of disk mirroring). In this situation, however, it is important to replace the faulty disk and rebuild the mirror before the healthy drive also fails.

To achieve this, install the new drive and restart the system. Right click on the failed volume and select ''Remove Mirror'' Next, identify a suitable alternate or newly installed drive with sufficient space to act as a mirror. Right click on the existing volume from the original mirrored set, select ''Add Mirror'' from the resulting menu, select the new disk and click on ''Add Mirror''. Windows will now rebuild the mirror using space on the new disk. As noted above this process can take some time depending on the size of the volume in question.