Troubleshooting

What problem are you having?

A basic disk's status is Not Initialized.

Cause:

The disk does not contain a valid signature. After you install a new disk, must write a disk signature, the end of sector marker (also called signature word), and a master boot record or GUID partition table before you can create partitions on the disk. When you first start Disk Management after installing a new disk, a wizard appears that provides a list of the new disks detected by . If you cancel the wizard before the disk signature is written, the disk status remains Not Initialized.

Solution:

Initialize the disk. The disk status briefly changes to Initializing and then Healthy status. For instructions describing how to initialize a disk, see To initialize new disks

For more information about disk status descriptions, see Disk status descriptions

A basic or dynamic disk's status is Unreadable.

Cause:

The basic or dynamic disk is not accessible and might have experienced hardware failure, corruption, or I/O errors. The disk's copy of the system's disk configuration database might be corrupted. An error icon appears on disks that display the Unreadable status.

Disks might also display the Unreadable status while they are spinning up or when Disk Management is rescanning all of the disks on the system. In some cases, an unreadable disk has failed and is not recoverable. For dynamic disks, the Unreadable status usually results from corruption or I/O errors on part of the disk, rather than failure of the entire disk.

Solution:

Rescan the disks or restart the computer to see if the disk status changes. For instructions describing how to rescan the disks, see To update disk information

For more information about disk status descriptions, see Disk status descriptions

A dynamic disk's status is Foreign.

Cause:

The Foreign status occurs when you move a dynamic disk to the local computer from another computer running Windows 2000 or . A warning icon appears on disks that display the Foreign status.

In some cases, a disk that was previously connected to the system can display the Foreign status. Configuration data for dynamic disks is stored on all dynamic disks, so the information about which disks are owned by the system is lost when all dynamic disks fail.

Solution:

Add the disk to your computer's system configuration so that you can access data on the disk. To add a disk to your computer's system configuration, import the foreign disk (right-click the disk and then click Import Foreign Disks). Any existing volumes on the foreign disk become visible and accessible when you import the disk.

For more information about disk status descriptions, see Disk status descriptions

A dynamic disk's status is Online (Errors).

Cause:

The dynamic disk has I/O errors on a region of the disk. A warning icon appears on the dynamic disk with errors.

Solution:

If the I/O errors are temporary, reactivate the disk to return it to Online status. For instructions describing how to bring the disk back online, see To reactivate a missing or offline dynamic disk

For more information about disk status descriptions, see Disk status descriptions

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 To 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

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.

For more information about disk status descriptions, see Disk status descriptions

A basic or dynamic volume's status is Failed.

Cause:

The basic or dynamic volume cannot be started automatically, the disk is damaged, or the file system is corrupt. Unless the disk or file system can be repaired, the Failed status indicates data loss.

Solution:

If the volume is a basic volume with Failed status, make sure that the underlying physical disk is turned on, plugged in, and attached to the computer. No other user action is possible for basic volumes.

If the volume is a dynamic volume with Failed status, make sure the underlying disks are online. If not, return the disks to the Online status. If this succeeds, the volume automatically restarts and returns to the Healthy status. For instructions describing how to bring a disk online, see To reactivate a missing or offline dynamic disk

If the dynamic disk returns to the Online status, but the dynamic volume does not return to the Healthy status, you can reactivate the volume manually. For instructions describing how to reactivate a volume, see To reactivate a dynamic volume

If the dynamic volume is a mirrored or RAID-5 volume with old data, bringing the underlying disk online will not automatically restart the volume. If the disks that contain current data are disconnected, you should bring those disks online first (to allow the data to become synchronized). Otherwise, restart the mirrored or RAID-5 volume manually, and then run Chkdsk.exe.

For instructions describing how to reactivate a volume, see To reactivate a dynamic volume To run Chkdsk.exe, click Start, click Run, type chkdsk, and then click OK.

For more information about volume status descriptions, see Volume status descriptions

A basic or dynamic volume's status is Unknown.

Cause:

The Unknown status occurs when the boot sector for the volume is corrupted (possibly due to a virus) and you can no longer access data on the volume. The Unknown status also occurs when you install a new disk but do not follow the wizard to create a disk signature.

Solution:

Initialize the disk. For instructions describing how to initialize a disk, see To initialize new disks

For more information about volume status descriptions, see Volume status descriptions

A dynamic volume's status is Data Incomplete.

Cause:

You moved some but not all of the disks in a multidisk volume. Data on this volume will be destroyed unless you move the remaining disks that contain this volume, and then import all of the disks at the same time. You cannot import the missing disks at a later time to restore the data.

Solution:

Move all of the disks that comprise the multidisk volume to the computer and then import the disks. For instructions describing how to move and import disks, see To move disks to another computer

For more information about volume status descriptions, see Volume status descriptions

A dynamic volume's status is Healthy (At Risk).

Cause:

Indicates that the dynamic volume is currently accessible, but I/O errors have been detected on the underlying dynamic disk. If an I/O error is detected on any part of a dynamic disk, all volumes on the disk display the Healthy (At Risk) status and a warning icon appears on the volume.

When the volume status is Healthy (At Risk), an underlying disk's status is usually Online (Errors).

Solution:

Return the underlying disk to the Online status. Once the disk is returned to Online status, the volume should return to the Healthy status. If the Healthy (At Risk) status persists, the disk might be failing. Back up the data and replace the disk as soon as possible. For instructions describing how to bring the disk back online, see To reactivate a missing or offline dynamic disk

For more information about volume status descriptions, see Volume status descriptions

A mirrored volume's status is Data Not Redundant.

Cause:

One half, but not both halves, of a mirrored volume was imported. In Disk Management, the imported half of the mirrored volume receives Failed Redundancy status, while the disk that holds the half of the mirror that was not imported receives Missing status. You can import the Missing disk at a later time to restore redundancy.

Solution:

Move all disks that span this volume to the new computer at the same time, and then import all of the disks together. For instructions describing how to move and import disks, see To move disks to another computer

If you no longer require a mirrored volume, you can break the mirror and retain the imported half of the mirror as a simple volume. Right-click the mirrored volume with Failed Redundancy status and then click Remove Mirror. In the Remove Mirror dialog box, click the disk with Missing status and then click Remove Mirror. The imported half of the mirror with Failed Redundancy status becomes a simple volume with Healthy status.

For more information about volume status descriptions, see Volume status descriptions

For more information about disk status descriptions, see Disk status descriptions

A mirrored volume's status is Failed Redundancy.

Cause:

One or both of the members of the mirrored volume has failed, and the volume is no longer fault tolerant To avoid data loss, you should attempt to repair the volume as soon as possible.

Solution:

If the dynamic disk's status is Offline or Missing (it cannot be accessed at all), an icon (X) appears in the graphical view of the Missing or Offline disk. For instructions describing how to repair the mirrored volume, see To reconnect the disk and repair the mirrored volume

If the disk's status is Online (Errors), an icon (!) appears in the graphical view of the disk. For instructions describing how to reactivate the disk, see To reactivate a mirrored volume

For more information about volume status descriptions, see Volume status descriptions

For more information about disk status descriptions, see Disk status descriptions

A mirrored volume's status is Stale Data.

Cause:

If you attempt to import disks that contain a mirrored volume, but one of the volumes on the disks contains stale mirror information, the status Stale Data appears in the Import Foreign Disks dialog box. This problem can occur when the volumes on the disks you moved had a status other than Healthy before you moved them.

Solution:

Move the disks back to the computer that they came from. In Disk Management, click Action, and then click Rescan Disks; or restart the computer to make sure all of the disks are installed correctly.

If the volume showed the Failed Redundancy status before the disks were moved, the volume will still show the Failed Redundancy status when the disks are moved back. Make sure that the status of the disk with stale mirror information is not Offline. If the status is Offline, check for any hardware problems, reconnect the disk if necessary, and then bring the disk back online. For instructions describing how to bring a mirrored volume back online, see To reactivate a mirrored volume

If the volume still shows the Failed Redundancy status, reactivate the volume. Disk Management will attempt to bring the volume back online. You will see a warning message indicating that Disk Management might not be able to bring back all of the data on the volume. For instructions describing how to reactivate a volume, see To reactivate a dynamic volume

If Disk Management successfully brings the volumes back online, the status of the volume becomes Healthy and any mirrored volumes on the disk will be resynchronized. Now you can move all of the disks that contain this volume to another computer. However, if you move all but one of the disks, then the volume will show the Data Not Redundant status in the Import Foreign Disk dialog box. You should attach the missing disks and import all of the disks at the same time.

For more information about volume status descriptions, see Volume status descriptions

For more information about disk status descriptions, see Disk status descriptions

A RAID-5 volume's status is Data Not Redundant.

Cause:

You moved some but not all of the disks in a RAID-5 volume. You cannot import the missing disks at a later time to restore redundancy. If you choose to import only some of the disks, the RAID-5 volume receives the Failed Redundancy status.

Solution:

Move all disks that comprise this volume to the new computer at the same time, and then import all of the disks together. For instructions describing how to move and import disks, see To move disks to another computer

For more information about volume status descriptions, see Volume status descriptions

A RAID-5 volume's status is Failed Redundancy.

Cause:

One or all of the members of the RAID-5 volume has failed and the volume is no longer fault tolerant To avoid data loss, you should attempt to repair the volume as soon as possible.

Solution:

If the dynamic disk's status is Offline or Missing (it can not be accessed at all), an icon (X) appears in the graphical view of the Missing or Offline disk. For instructions describing how to repair a RAID-5 volume, see To reconnect the disk and repair the RAID-5 volume

If the disk's status is Online (Errors), an icon (!) appears in the graphical view of the partially failed disk. For instructions describing how to reactivate the disk, see To reactivate a RAID-5 disk

For more information about volume status descriptions, see Volume status descriptions

For more information about disk status descriptions, see Disk status descriptions

A RAID-5 volume's status is Stale Data.

Cause:

If you attempt to import disks that contain a RAID-5 volume, but one of the volumes on the disks contains stale parity information, the status Stale Data appears in the Import Foreign Disks dialog box. This problem can occur when the volumes on the disks you moved had a status other than Healthy before you moved them.

Solution:

Move the disks back to the computer that they came from. In Disk Management, click Action, and then click Rescan Disks; or restart the computer to make sure all of the disks are installed correctly.

If the volume showed the Failed Redundancy status before the disks were moved, the volume will still show the Failed Redundancy status when the disks are moved back. Make sure that the status of the disk that contained the stale parity information is not Offline. If the status is Offline, check for any hardware problems, reconnect the disk if necessary, and then bring the disk back online. For instructions describing how to bring a RAID-5 volume back online, see To reactivate a RAID-5 disk

If the volume still shows the Failed Redundancy status, reactivate the volume. Disk Management will attempt to bring the volume back online. You will see a warning message indicating that Disk Management might not be able to bring back all of the data on the volume. For instructions describing how to reactivate a volume, see To reactivate a dynamic volume

If Disk Management successfully brings the volumes back online, the status of the volume becomes Healthy and any RAID-5 volumes will regenerate parity. Now you can move all of the disks that contain this volume to another computer. However, if you move all but one of the disks, then the volume will show the Data Not Redundant status in the Import Foreign Disk dialog box. You should attach the missing disks and import all of the disks at the same time.

For more information about volume status descriptions, see Volume status descriptions

For more information about disk status descriptions, see Disk status descriptions



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