Cause: An attempt was made to ADD to a diskgroup a disk which was already part of another diskgroup. The other diskgroup was written by a more recent software release. See the solution below.
Error solution: Check the path specifier for the disk. If it is certain that the disk is not in use by another diskgroup, the FORCE option may be used to override this check.
Database version: Oracle 11g Release 2 (11.2)