code: func CheckDiskFormatSupported(diskFormat string) bool {
  	if DiskFormatValidType[diskFormat] == "" {
  		klog.Errorf("Not a valid Disk Format. Valid options are %+q", DiskformatValidOptions())
  		return false
  	}
  	return true
  }
docs: // CheckDiskFormatSupported checks if the diskFormat is valid