Cause

ASM disks tend to be used and purged over time. If an ASM instance is purged and physical ASM disks are left in their existing spurious state, they contain diskgroup information that can interfere with future ASM creation. This happens if the newly created ASM uses the same diskgroup name as exists in the header of such a raw disk. If such a spurious disk exists in the disk discovery path of the newly created ASM it will get consumed and raise unexpected error.