}

	if err := scanner.Err(); err != nil {
		return nil, err
	}

	return result, nil
}

func getDiskUUIDMap() (map[string]string, error) {
	result := make(map[string]string)
	err := filepath.Walk("/dev/disk/by-uuid/",
		func(path string, info os.FileInfo, err error) error {
			if err != nil {
				return err
			}
			realPath, err := filepath.EvalSymlinks(path)
			if err != nil {
				return err
			}

					return entries, nil
				}
			} else {
				err = fmt.Errorf("invalid pool/set")
				o.pool, o.set = 0, 0
			}
		}
		if IsErr(err, []error{
			nil,
			context.Canceled,
			context.DeadlineExceeded,
			// io.EOF is expected and should be returned but no need to log it.
			io.EOF,
		}...) {
			// Expected good errors we don't need to return error.
			return entries, err
		}
		entries.truncate(0)

			t.Errorf("WriteHeader() = got %v, want non-nil error", err)
		}
		if _, err := tw.Write(nil); err == nil {
			t.Errorf("Write() = %v, want non-nil error", err)
		}
		if err := tw.Flush(); err == nil {
			t.Errorf("Flush() = %v, want non-nil error", err)
		}
		if err := tw.Close(); err == nil {
			t.Errorf("Close() = %v, want non-nil error", err)
		}
	})
}

// that is not io.EOF.
func diskHealthCheckOK(ctx context.Context, err error) bool {
	// Check if context has a disk health check.
	tracker, ok := ctx.Value(healthDiskCtxKey{}).(*healthDiskCtxValue)
	if !ok {
		// No tracker, return
		return err == nil || errors.Is(err, io.EOF)
	}
	if err == nil || errors.Is(err, io.EOF) {
		tracker.logSuccess()
		return true
	}

			break
		}

		var err error
		bufs, err = reader.Read(bufs)
		if len(bufs) > 0 {
			// Set only if there are be enough data for reconstruction.
			// and only for expected errors, also set once.
			if errors.Is(err, errFileNotFound) || errors.Is(err, errFileCorrupt) {
				if derr == nil {
					derr = err
				}
			}
		} else if err != nil {

		if contextCanceled(ctx) {
			parts[idx] = &ObjectPartInfo{
				Error:  ctx.Err().Error(),
				Number: partNumber,
			}
			continue
		}

		if err := Access(pathJoin(volumeDir, pathutil.Dir(partMetaPath), fmt.Sprintf("part.%d", partNumber))); err != nil {
			parts[idx] = &ObjectPartInfo{
				Error:  err.Error(),
				Number: partNumber,
			}
			continue
		}

-----------------
failure for all cases.

// Pseudo code for managing `format.json`.

// Generic checks.
if (no quorum) return error
if (any disk is corrupt) return error // Always error
if (jbod inconsistent) return error // Always error.
if (disks not recognized) // Always error.

// Specific checks.
if (all disks online)
  if (all disks return format.json)
     if (jbod consistent)

			if err != nil {
				t.Fatal(err)
			}

			errStr := ""
			err = checkPostPolicy(tt.fv.Header, postPolicyForm)
			if err != nil {
				errStr = err.Error()
			}
			if errStr != tt.wantErr {
				t.Errorf("test: '%s', want error: '%s', got error: '%s'", tt.name, tt.wantErr, errStr)
			}
		})
	}

			p.errorf("register list: expected ']', found EOF")
		} else {
			p.errorf("register list: bad low register in `[%s`", loName)
		}
		return
	}
	if tok := p.next().ScanToken; tok != '-' {
		p.errorf("register list: expected '-' after `[%s`, found %s", loName, tok)
		return
	}
	hiName := p.next().String()
	hi, ok := p.arch.Register[hiName]
	if !ok {

		return errFaultyRemoteDisk
	case errFileCorrupt.Error():
		return errFileCorrupt
	case errUnexpected.Error():
		return errUnexpected
	case errDiskFull.Error():
		return errDiskFull
	case errVolumeNotFound.Error():
		return errVolumeNotFound
	case errVolumeExists.Error():
		return errVolumeExists
	case errFileNotFound.Error():
		return errFileNotFound
	case errFileVersionNotFound.Error():