You may want to break a mirrored set or remove mirroring. Breaking a mirrored set and removing a mirror are two very different operations. When you break a mirrored set, you stop mirroring and break the mirrored set into two independent volumes— both of which contain all the original data. When you remove a mirror, you stop mirroring and remove all data from one on the volumes so that you can use it for other purposes.
You also may need to break a mirrored set to repair a mirrored set. For example, if one of the mirrored drives in a set fails, disk operations can continue. However, at some point you'll need to fix the mirror, and to do this you must break the mirror and then reestablish it.
In Disk Management, you can break a mirrored set by following these steps:
1. Although breaking a mirror doesn't delete the data in the set, you should always back up your data before you break the mirror. This ensures that if you have problems, you can recover your data.
2. Right-click one of the volumes in the mirrored set, and then click Break Mirrored Volume.
3. Confirm that you want to break the mirror by clicking Yes. If the volume is in use, you'll see another warning dialog box. Click Yes to confirm that it's OK to continue.
4. Windows breaks the mirror, creating two independent volumes.
In Disk Management, you can remove one of the volumes from a mirrored set. When you do this, all data on the mirror you remove is deleted, and the space it used is marked as Unallocated. To remove a mirror, follow these steps:
1. In Disk Management, right-click one of the volumes in the mirrored set, and then click Remove Mirror. This displays the Remove Mirror dialog box.
2. In the Remove Mirror dialog box, select the disk from which to remove the mirror.
3. Confirm the action when prompted. All data on the removed mirror is deleted.
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