A. A. If you have a partition in Disk Administrator that is of type unknown it does not necessarily mean the partition is corrupt. If the user has no permissions on the root of the drive then Unknown will be shown as the file type. To correct this perform the following:
- Start Explorer
- Right click on the root of the partition and select Properties
- Select the Security tab
- Click the Ownership button
- Click the "Take Ownership" button
- Click Yes to all confirmation dialog boxes
The file system type of the partition will now be visible in Disk Administrator.
Also remember Disk Administrator cannot understand non NT partitions such as Linux partitions which would also give the volume type is unknown error.