disks[i], len(formats), humanize.Ordinal(i+1), len(formatErasure.Erasure.Sets)*len(formatErasure.Erasure.Sets[0]))
		}
		if len(formatErasure.Erasure.Sets[0]) != setDriveCount {
			return fmt.Errorf("%s drive is already formatted with %d drives per erasure set. This cannot be changed to %d", disks[i], len(formatErasure.Erasure.Sets[0]), setDriveCount)
		}
	}
	return nil
}

// Get backend Erasure format in quorum `format.json`.