err = en.Append(0xa2, 0x49, 0x44)
		if err != nil {
			return
		}
		err = en.WriteBytes((z.VersionID)[:])
		if err != nil {
			err = msgp.WrapError(err, "VersionID")
			return
		}
		// write "DDir"
		err = en.Append(0xa4, 0x44, 0x44, 0x69, 0x72)
		if err != nil {
			return
		}
		err = en.WriteBytes((z.DataDir)[:])
		if err != nil {
			err = msgp.WrapError(err, "DataDir")
			return