opts.finished(errs)
			}
			var combinedErr []string
			for i, err := range errs {
				if err != nil {
					if disks[i] != nil {
						combinedErr = append(combinedErr,
							fmt.Sprintf("drive %s returned: %s", disks[i], err))
					} else {
						combinedErr = append(combinedErr, err.Error())
					}
				}
			}
			return errors.New(strings.Join(combinedErr, ", "))
		}