Apparatus having a plurality of strings of series-connected memory cells, and methods of their operation, where each string of the plurality of strings is selectively connected to a common data line through a corresponding respective select gate. A first set of access lines are each coupled to a respective memory cell of each string of series-connected memory cells of the plurality of strings of series-connected memory cells. A second set of access lines are each coupled to a respective memory cell of each string of series-connected memory cells of only a portion of the plurality of strings of series-connected memory cells.