if err != nil {
					log.Println("FAILED: GET", objFullPath(object), "=>", err)
					failedMD5 = true
					break
				}
				h := md5.New()
				if _, err := io.Copy(h, obj); err != nil {
					log.Println("FAILED: MD5 calculation error:", objFullPath(object), "=>", err)
					failedMD5 = true
					break
				}
				partsMD5Sum = append(partsMD5Sum, h.Sum(nil))
			}

			if failedMD5 {

	tgtSha256 := sha256.New()

	for {
		srcSha256.Reset()
		tgtSha256.Reset()

		srcEOF = !srcOk
		tgtEOF = !tgtOk

		// No objects from source AND target: Finish
		if srcEOF && tgtEOF {
			break
		}

		if !srcEOF && srcCtnt.Err != nil {
			log.Fatal(srcCtnt.Err)
		}

		if !tgtEOF && tgtCtnt.Err != nil {
			log.Fatal(tgtCtnt.Err)
		}

		parityData[data] = set

		// Combine
		start := len(b) * idx
		if start >= len(mapped) {
			continue
		}
		copy(mapped[start:], b)
		for j := range b {
			if j+start >= len(filled) {
				break
			}
			filled[j+start] = 1
		}
	}

	lastValid := 0
	missing := 0
	for i := range filled {
		if filled[i] == 1 {
			lastValid = i
		} else {
			missing++
		}
	}