To bring a dynamic volume back to a healthy state

1. First you need to attempt to bring the disk or disks to which the volume belongs to Online status by doing a Rescan and, if necessary, a Reactivate Disk.

   Dynamic disks belonging to a Microsoft Disk Management Disk Group do not support the Reactivate Disk command.

   If one of the disks has failed and you have a mirrored or RAID-5 volume, the repair involves recreating part of the volume in a different location.

2. If a disk comes back online after reactivating, check to see whether its volumes are healthy. If not, try the Reactivate Volume command on its volumes.

   Dynamic disks belonging to a Microsoft Disk Management Disk Group do not support the Reactivate Volume command.

3. Run Chkdsk.exe to make sure that the underlying file system structure is intact.

   To run Chkdsk, open a command prompt window and enter the following command:

   chkdsk x: /f

   where x is the drive letter of the volume you want to check. The /f option tells Chkdsk to fix any errors it finds. If the /f option is omitted, Chkdsk operates in a read-only mode.

   Although Chkdsk cleans up the file system structure, the disk may have invalid data if users are working when a problem occurred on the disk. It is highly recommended that you run utilities to check the integrity of the data. If the data is corrupted, you need to replace it from backup storage.