for i := 0; i < len(tmpFormat.Erasure.Sets); i++ {
		for j := 0; j < len(tmpFormat.Erasure.Sets[i]); j++ {
			if this == tmpFormat.Erasure.Sets[i][j] {
				return nil
			}
		}
	}
	return fmt.Errorf("DriveID %s not found in any drive sets %s", this, format.Erasure.Sets)
}

// saveFormatErasureAll - populates `format.json` on disks in its order.