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A dynamic disk's status is Offline or Missing.
Cause: An Offline dynamic disk might be corrupted or intermittently unavailable. An error icon appears on the offline dynamic disk.
If the disk status is Offline and the disk's name changes to Missing, the disk was recently available on the system but can no longer be located or identified. The missing disk may be corrupted, powered down, or disconnected.
Solution:
To bring a disk that is Offline and Missing back online
Repair any disk, controller, or cable problems and make sure that the physical disk is turned on, plugged in, and attached to the computer. Next, use the Reactivate Disk command to bring the disk back online. For instructions describing how to reactivate missing or offline disks, see Reactivate a missing or offline dynamic disk.
If the disk status remains Offline and the disk name remains Missing, and you determine that the disk has a problem that cannot be repaired, you can remove the disk from the system (right-click the disk and then click Remove Disk). However, before you can remove the disk, you must delete all volumes (or mirrors) on the disk. You can save any mirrored volumes on the disk by removing the mirror instead of the entire volume. Deleting a volume destroys the data in the volume, so you should remove a disk only if you are absolutely certain that the disk is permanently damaged and unusable.
To bring a disk that is Offline and is still named Disk # (not Missing) back online, try one or more of the following:
• In Disk Management, right-click the disk and then click Reactivate Disk to bring the disk back online. If the disk status remains Offline, check the cables and disk controller, and make sure that the physical disk is healthy. Correct any problems and try to reactivate the disk again. If the disk reactivation succeeds, any volumes on the disk should automatically return to the Healthy status.
• In Event Viewer, check the event logs for any disk related errors such as “no good config copies”. If the event logs contain the "no good config copies" error, contact Microsoft Product Support Services.
• Try moving the disk to another computer. If you can get the disk to go Online on another computer, the problem is most likely due to the configuration of the computer where the disk does not go Online.
• Try moving the disk to another computer that has dynamic disks. Import the disk on that computer and then move it back to the computer where it would not go Online.
