In addition to this issue on Disk Management console view, sometimes Windows may show "an unexpected error has occurred" message and also ask to close the Disk Management console, then restart Disk Management or restart the computer. And below is the thumbnail of the very error message: This kind of partitions is always without a drive letter, file system, partition type (primary or logical), or other necessary information. Generally, users can finish those operations with ease since detailed instructions are provided, but a lot of users frequently report the error – Disk Management console view is not up-to-date, when they are doing specific operations, like format partition, assign a drive letter, and view partition properties.
For example the directory path part MSSQL.1 could be MSSQL.2 or MSSQL.3 depending on install order and number of instances.
Once you have verified everything is ok (check SQL error logs etc) you can delete it. Finally move the remaining data in the original location to the new location and rename the root directory.In HKLM\SOFTWARE\MICROSOFT\MICROSOFT SQL Server\MSSQL.1\SQLServerAgent change the value for ErrorLogFile and WorkingDirectory to the new path.In HKLM\SOFTWARE\MICROSOFT\MICROSOFT SQL Server\MSSQL.1\Replication change the value for WorkingDirectory to the new path.(This updates the Data Path value that is greyed out in the SQL Server configuration manager). In HKLM\SOFTWARE\MICROSOFT\MICROSOFT SQL Server\MSSQL.1\Setup change the value for SQLDataRoot to the new path.In HKLM\SOFTWARE\MICROSOFT\MICROSOFT SQL Server\MSSQL.1\MSSQLServer change the value for BackupDirectory and defaultlog to new location.
Using the SQL Server configuration manager update the path for Dump Directory and the error log (part of the startup parameters, screenshot below)