return err
			}

			if len(pfi.Parts) != 1 {
				return errors.New("invalid number of parts expected 1, got 0")
			}

			if partN != pfi.Parts[0].Number {
				return fmt.Errorf("part.%d.meta has incorrect corresponding part number: expected %d, got %d", partN, partN, pfi.Parts[0].Number)
			}

			partsInfo[i] = pfi.Parts[0]
			return nil
		}, i)
	}

	g.Wait()