case "EcN":
			z.ErasureN, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "ErasureN")
				return
			}
		case "EcBSize":
			z.ErasureBlockSize, err = dc.ReadInt64()
			if err != nil {
				err = msgp.WrapError(err, "ErasureBlockSize")
				return
			}
		case "EcIndex":
			z.ErasureIndex, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "ErasureIndex")
				return

	ErasureN           int               `json:"EcN" msg:"EcN"`                                  // Erasure parity blocks
	ErasureBlockSize   int64             `json:"EcBSize" msg:"EcBSize"`                          // Erasure block size
	ErasureIndex       int               `json:"EcIndex" msg:"EcIndex"`                          // Erasure disk index