Issue If the volume label has invalid characters ("/" or "_" or "-", etc.), you may not be able to enter them in the volume field to delete the partition, or you don’t know what the volume label is. Solution To delete this partition, place the cursor in the volume field and press both the ALT key and the F12 key (Function 12 key) simultaneously. This will bypass the naming convention of the volume label and will let you continue on to delete the partition.