if err != nil {
			return nil, 0, 0, err
		}
		var decRangeLength int64
		decRangeLength, err = rs.GetLength(decSize)
		if err != nil {
			return nil, 0, 0, err
		}

		// We define a closure that performs decryption given
		// a reader that returns the desired range of
		// encrypted bytes. The header parameter is used to
		// provide encryption parameters.

		eps := make([]Endpoint, s.setDriveCount)
		copy(eps, s.endpoints.Endpoints[setIndex*s.setDriveCount:setIndex*s.setDriveCount+s.setDriveCount])
		return eps
	}
}

// GetDisks returns a closure for a given set, which provides list of disks per set.
func (s *erasureSets) GetDisks(setIndex int) func() []StorageAPI {
	return func() []StorageAPI {
		s.erasureDisksMu.RLock()
		defer s.erasureDisksMu.RUnlock()