} else {
            _ = c.computeNodeExtents(n.NodeSequenceNumber, &dataRange{blocks: c.dataReaderBlocksRemaining}) // called here to ensure things are computed in order
            c.dataReader = io.MultiReader(n.File, io.LimitReader(vio.Zeroes, c.dataReaderBlocksRemaining*c.blockSize()-int64(n.File.Size())))
        }