var found bool
		for _, ss := range setCounts {
			if ss == setDriveCount {
				found = true
			}
		}
		if !found {
			return nil, config.ErrInvalidErasureSetSize(nil).Msg(msg)
		}

		// No automatic symmetry calculation expected, user is on their own
		setSize = setDriveCount
	} else {
		// Returns possible set counts with symmetry.